drivers/staging/hv/Channel.c

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include "osd.h"
  27 #include "include/logging.h"
  28
  29 #include "VmbusPrivate.h"
  30
  31 /* Internal routines */
  32 static int VmbusChannelCreateGpadlHeader(
  33         void *                                  Kbuffer,        /* must be phys and virt contiguous */
  34         u32                                     Size,           /* page-size multiple */
  35         struct vmbus_channel_msginfo **msgInfo,
  36         u32                                     *MessageCount
  37         );
  38 static void DumpVmbusChannel(struct vmbus_channel *channel);
  39 static void VmbusChannelSetEvent(struct vmbus_channel *channel);
  40
  41
  42 #if 0
  43 static void
  44 DumpMonitorPage(
  45         HV_MONITOR_PAGE *MonitorPage
  46         )
  47 {
  48         int i=0;
  49         int j=0;
  50
  51         DPRINT_DBG(VMBUS, "monitorPage - %p, trigger state - %d", MonitorPage, MonitorPage->TriggerState);
  52
  53         for (i=0; i<4; i++)
  54         {
  55                 DPRINT_DBG(VMBUS, "trigger group (%d) - %llx", i, MonitorPage->TriggerGroup[i].AsUINT64);
  56         }
  57
  58         for (i=0; i<4; i++)
  59         {
  60                 for (j=0; j<32; j++)
  61                 {
  62                         DPRINT_DBG(VMBUS, "latency (%d)(%d) - %llx", i, j, MonitorPage->Latency[i][j]);
  63                 }
  64         }
  65         for (i=0; i<4; i++)
  66         {
  67                 for (j=0; j<32; j++)
  68                 {
  69                         DPRINT_DBG(VMBUS, "param-conn id (%d)(%d) - %d", i, j, MonitorPage->Parameter[i][j].ConnectionId.Asu32);
  70                         DPRINT_DBG(VMBUS, "param-flag (%d)(%d) - %d", i, j, MonitorPage->Parameter[i][j].FlagNumber);
  71
  72                 }
  73         }
  74 }
  75 #endif
  76
  77 /*++
  78
  79 Name:
  80         VmbusChannelSetEvent()
  81
  82 Description:
  83         Trigger an event notification on the specified channel.
  84
  85 --*/
  86 static void VmbusChannelSetEvent(struct vmbus_channel *Channel)
  87 {
  88         HV_MONITOR_PAGE *monitorPage;
  89
  90         DPRINT_ENTER(VMBUS);
  91
  92         if (Channel->OfferMsg.MonitorAllocated)
  93         {
  94                 /* Each u32 represents 32 channels */
  95                 set_bit(Channel->OfferMsg.ChildRelId & 31,
  96                         (unsigned long *) gVmbusConnection.SendInterruptPage +
  97                         (Channel->OfferMsg.ChildRelId >> 5) );
  98
  99                 monitorPage = (HV_MONITOR_PAGE*)gVmbusConnection.MonitorPages;
 100                 monitorPage++; /* Get the child to parent monitor page */
 101
 102                 set_bit(Channel->MonitorBit,
 103                         (unsigned long *) &monitorPage->TriggerGroup[Channel->MonitorGroup].Pending);
 104
 105         }
 106         else
 107         {
 108                 VmbusSetEvent(Channel->OfferMsg.ChildRelId);
 109         }
 110
 111         DPRINT_EXIT(VMBUS);
 112 }
 113
 114 #if 0
 115 static void VmbusChannelClearEvent(struct vmbus_channel *channel)
 116 {
 117         HV_MONITOR_PAGE *monitorPage;
 118
 119         DPRINT_ENTER(VMBUS);
 120
 121         if (Channel->OfferMsg.MonitorAllocated)
 122         {
 123                 /* Each u32 represents 32 channels */
 124                 clear_bit(Channel->OfferMsg.ChildRelId & 31,
 125                           (unsigned long *) gVmbusConnection.SendInterruptPage + (Channel->OfferMsg.ChildRelId >> 5));
 126
 127                 monitorPage = (HV_MONITOR_PAGE*)gVmbusConnection.MonitorPages;
 128                 monitorPage++; /* Get the child to parent monitor page */
 129
 130                 clear_bit(Channel->MonitorBit,
 131                           (unsigned long *) &monitorPage->TriggerGroup[Channel->MonitorGroup].Pending);
 132         }
 133
 134         DPRINT_EXIT(VMBUS);
 135 }
 136
 137 #endif
 138 /*++;
 139
 140 Name:
 141         VmbusChannelGetDebugInfo()
 142
 143 Description:
 144         Retrieve various channel debug info
 145
 146 --*/
 147 void VmbusChannelGetDebugInfo(struct vmbus_channel *Channel,
 148                               struct vmbus_channel_debug_info *DebugInfo)
 149 {
 150         HV_MONITOR_PAGE *monitorPage;
 151     u8 monitorGroup    = (u8)Channel->OfferMsg.MonitorId / 32;
 152     u8 monitorOffset   = (u8)Channel->OfferMsg.MonitorId % 32;
 153         /* u32 monitorBit       = 1 << monitorOffset; */
 154
 155         DebugInfo->RelId = Channel->OfferMsg.ChildRelId;
 156         DebugInfo->State = Channel->State;
 157         memcpy(&DebugInfo->InterfaceType, &Channel->OfferMsg.Offer.InterfaceType, sizeof(GUID));
 158         memcpy(&DebugInfo->InterfaceInstance, &Channel->OfferMsg.Offer.InterfaceInstance, sizeof(GUID));
 159
 160         monitorPage = (HV_MONITOR_PAGE*)gVmbusConnection.MonitorPages;
 161
 162         DebugInfo->MonitorId = Channel->OfferMsg.MonitorId;
 163
 164         DebugInfo->ServerMonitorPending = monitorPage->TriggerGroup[monitorGroup].Pending;
 165         DebugInfo->ServerMonitorLatency = monitorPage->Latency[monitorGroup][ monitorOffset];
 166         DebugInfo->ServerMonitorConnectionId = monitorPage->Parameter[monitorGroup][ monitorOffset].ConnectionId.u.Id;
 167
 168         monitorPage++;
 169
 170         DebugInfo->ClientMonitorPending = monitorPage->TriggerGroup[monitorGroup].Pending;
 171         DebugInfo->ClientMonitorLatency = monitorPage->Latency[monitorGroup][ monitorOffset];
 172         DebugInfo->ClientMonitorConnectionId = monitorPage->Parameter[monitorGroup][ monitorOffset].ConnectionId.u.Id;
 173
 174         RingBufferGetDebugInfo(&Channel->Inbound, &DebugInfo->Inbound);
 175         RingBufferGetDebugInfo(&Channel->Outbound, &DebugInfo->Outbound);
 176 }
 177
 178
 179 /*++;
 180
 181 Name:
 182         VmbusChannelOpen()
 183
 184 Description:
 185         Open the specified channel.
 186
 187 --*/
 188 int VmbusChannelOpen(struct vmbus_channel *NewChannel,
 189         u32                                     SendRingBufferSize,
 190         u32                                     RecvRingBufferSize,
 191         void *                                  UserData,
 192         u32                                     UserDataLen,
 193         PFN_CHANNEL_CALLBACK    pfnOnChannelCallback,
 194         void *                                  Context
 195         )
 196 {
 197         int ret=0;
 198         VMBUS_CHANNEL_OPEN_CHANNEL* openMsg;
 199         struct vmbus_channel_msginfo *openInfo;
 200         void *in, *out;
 201         unsigned long flags;
 202
 203         DPRINT_ENTER(VMBUS);
 204
 205         /* Aligned to page size */
 206         ASSERT(!(SendRingBufferSize & (PAGE_SIZE -1)));
 207         ASSERT(!(RecvRingBufferSize & (PAGE_SIZE -1)));
 208
 209         NewChannel->OnChannelCallback = pfnOnChannelCallback;
 210         NewChannel->ChannelCallbackContext = Context;
 211
 212         /* Allocate the ring buffer */
 213         out = osd_PageAlloc((SendRingBufferSize + RecvRingBufferSize) >> PAGE_SHIFT);
 214         /* out = kzalloc(sendRingBufferSize + recvRingBufferSize, GFP_KERNEL); */
 215         ASSERT(out);
 216         ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0);
 217
 218         in = (void*)((unsigned long)out + SendRingBufferSize);
 219
 220         NewChannel->RingBufferPages = out;
 221         NewChannel->RingBufferPageCount = (SendRingBufferSize + RecvRingBufferSize) >> PAGE_SHIFT;
 222
 223         RingBufferInit(&NewChannel->Outbound, out, SendRingBufferSize);
 224
 225         RingBufferInit(&NewChannel->Inbound, in, RecvRingBufferSize);
 226
 227         /* Establish the gpadl for the ring buffer */
 228         DPRINT_DBG(VMBUS, "Establishing ring buffer's gpadl for channel %p...", NewChannel);
 229
 230         NewChannel->RingBufferGpadlHandle = 0;
 231
 232         ret = VmbusChannelEstablishGpadl(NewChannel,
 233                 NewChannel->Outbound.RingBuffer,
 234                 SendRingBufferSize + RecvRingBufferSize,
 235                 &NewChannel->RingBufferGpadlHandle);
 236
 237         DPRINT_DBG(VMBUS, "channel %p <relid %d gpadl 0x%x send ring %p size %d recv ring %p size %d, downstreamoffset %d>",
 238                 NewChannel,
 239                 NewChannel->OfferMsg.ChildRelId,
 240                 NewChannel->RingBufferGpadlHandle,
 241                 NewChannel->Outbound.RingBuffer,
 242                 NewChannel->Outbound.RingSize,
 243                 NewChannel->Inbound.RingBuffer,
 244                 NewChannel->Inbound.RingSize,
 245                 SendRingBufferSize);
 246
 247         /* Create and init the channel open message */
 248         openInfo = kmalloc(sizeof(*openInfo) + sizeof(VMBUS_CHANNEL_OPEN_CHANNEL), GFP_KERNEL);
 249         ASSERT(openInfo != NULL);
 250
 251         openInfo->WaitEvent = osd_WaitEventCreate();
 252
 253         openMsg = (VMBUS_CHANNEL_OPEN_CHANNEL*)openInfo->Msg;
 254         openMsg->Header.MessageType                             = ChannelMessageOpenChannel;
 255         openMsg->OpenId                                                 = NewChannel->OfferMsg.ChildRelId; /* FIXME */
 256     openMsg->ChildRelId                                         = NewChannel->OfferMsg.ChildRelId;
 257     openMsg->RingBufferGpadlHandle                      = NewChannel->RingBufferGpadlHandle;
 258     ASSERT(openMsg->RingBufferGpadlHandle);
 259     openMsg->DownstreamRingBufferPageOffset             = SendRingBufferSize >> PAGE_SHIFT;
 260     openMsg->ServerContextAreaGpadlHandle       = 0; /* TODO */
 261
 262         ASSERT(UserDataLen <= MAX_USER_DEFINED_BYTES);
 263         if (UserDataLen)
 264         {
 265                 memcpy(openMsg->UserData, UserData, UserDataLen);
 266         }
 267
 268         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 269         INSERT_TAIL_LIST(&gVmbusConnection.ChannelMsgList, &openInfo->MsgListEntry);
 270         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 271
 272         DPRINT_DBG(VMBUS, "Sending channel open msg...");
 273
 274         ret = VmbusPostMessage(openMsg, sizeof(VMBUS_CHANNEL_OPEN_CHANNEL));
 275         if (ret != 0)
 276         {
 277                 DPRINT_ERR(VMBUS, "unable to open channel - %d", ret);
 278                 goto Cleanup;
 279         }
 280
 281         /* FIXME: Need to time-out here */
 282         osd_WaitEventWait(openInfo->WaitEvent);
 283
 284         if (openInfo->Response.OpenResult.Status == 0)
 285         {
 286                 DPRINT_INFO(VMBUS, "channel <%p> open success!!", NewChannel);
 287         }
 288         else
 289         {
 290                 DPRINT_INFO(VMBUS, "channel <%p> open failed - %d!!", NewChannel, openInfo->Response.OpenResult.Status);
 291         }
 292
 293 Cleanup:
 294         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 295         REMOVE_ENTRY_LIST(&openInfo->MsgListEntry);
 296         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 297
 298         kfree(openInfo->WaitEvent);
 299         kfree(openInfo);
 300
 301         DPRINT_EXIT(VMBUS);
 302
 303         return 0;
 304 }
 305
 306 /*++;
 307
 308 Name:
 309         DumpGpadlBody()
 310
 311 Description:
 312         Dump the gpadl body message to the console for debugging purposes.
 313
 314 --*/
 315 static void DumpGpadlBody(
 316         VMBUS_CHANNEL_GPADL_BODY        *Gpadl,
 317         u32                                             Len)
 318 {
 319         int i=0;
 320         int pfnCount=0;
 321
 322         pfnCount = (Len - sizeof(VMBUS_CHANNEL_GPADL_BODY))/ sizeof(u64);
 323         DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", Len, pfnCount);
 324
 325         for (i=0; i< pfnCount; i++)
 326         {
 327                 DPRINT_DBG(VMBUS, "gpadl body  - %d) pfn %llu", i, Gpadl->Pfn[i]);
 328         }
 329 }
 330
 331
 332 /*++;
 333
 334 Name:
 335         DumpGpadlHeader()
 336
 337 Description:
 338         Dump the gpadl header message to the console for debugging purposes.
 339
 340 --*/
 341 static void DumpGpadlHeader(
 342         VMBUS_CHANNEL_GPADL_HEADER      *Gpadl
 343         )
 344 {
 345         int i=0,j=0;
 346         int pageCount=0;
 347
 348
 349         DPRINT_DBG(VMBUS, "gpadl header - relid %d, range count %d, range buflen %d",
 350                                 Gpadl->ChildRelId,
 351                                 Gpadl->RangeCount,
 352                                 Gpadl->RangeBufLen);
 353         for (i=0; i< Gpadl->RangeCount; i++)
 354         {
 355                 pageCount = Gpadl->Range[i].ByteCount >> PAGE_SHIFT;
 356                 pageCount = (pageCount > 26)? 26 : pageCount;
 357
 358                 DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d page count %d",
 359                         i, Gpadl->Range[i].ByteCount, Gpadl->Range[i].ByteOffset, pageCount);
 360
 361                 for (j=0; j< pageCount; j++)
 362                 {
 363                         DPRINT_DBG(VMBUS, "%d) pfn %llu", j, Gpadl->Range[i].PfnArray[j]);
 364                 }
 365         }
 366 }
 367
 368 /*++;
 369
 370 Name:
 371         VmbusChannelCreateGpadlHeader()
 372
 373 Description:
 374         Creates a gpadl for the specified buffer
 375
 376 --*/
 377 static int
 378 VmbusChannelCreateGpadlHeader(
 379         void *                                  Kbuffer,        /* from kmalloc() */
 380         u32                                     Size,           /* page-size multiple */
 381         struct vmbus_channel_msginfo **MsgInfo,
 382         u32                                     *MessageCount)
 383 {
 384         int i;
 385         int pageCount;
 386     unsigned long long pfn;
 387         VMBUS_CHANNEL_GPADL_HEADER* gpaHeader;
 388         VMBUS_CHANNEL_GPADL_BODY* gpadlBody;
 389         struct vmbus_channel_msginfo *msgHeader;
 390         struct vmbus_channel_msginfo *msgBody;
 391         u32                             msgSize;
 392
 393         int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize;
 394
 395         /* ASSERT( (kbuffer & (PAGE_SIZE-1)) == 0); */
 396         ASSERT( (Size & (PAGE_SIZE-1)) == 0);
 397
 398         pageCount = Size >> PAGE_SHIFT;
 399         pfn = virt_to_phys(Kbuffer) >> PAGE_SHIFT;
 400
 401         /* do we need a gpadl body msg */
 402         pfnSize = MAX_SIZE_CHANNEL_MESSAGE - sizeof(VMBUS_CHANNEL_GPADL_HEADER) - sizeof(GPA_RANGE);
 403         pfnCount = pfnSize / sizeof(u64);
 404
 405         if (pageCount > pfnCount) /* we need a gpadl body */
 406         {
 407                 /* fill in the header */
 408                 msgSize = sizeof(struct vmbus_channel_msginfo) + sizeof(VMBUS_CHANNEL_GPADL_HEADER) + sizeof(GPA_RANGE) + pfnCount*sizeof(u64);
 409                 msgHeader =  kzalloc(msgSize, GFP_KERNEL);
 410
 411                 INITIALIZE_LIST_HEAD(&msgHeader->SubMsgList);
 412                 msgHeader->MessageSize=msgSize;
 413
 414                 gpaHeader = (VMBUS_CHANNEL_GPADL_HEADER*)msgHeader->Msg;
 415                 gpaHeader->RangeCount = 1;
 416                 gpaHeader->RangeBufLen = sizeof(GPA_RANGE) + pageCount*sizeof(u64);
 417                 gpaHeader->Range[0].ByteOffset = 0;
 418                 gpaHeader->Range[0].ByteCount = Size;
 419                 for (i=0; i<pfnCount; i++)
 420                 {
 421                         gpaHeader->Range[0].PfnArray[i] = pfn+i;
 422                 }
 423                 *MsgInfo = msgHeader;
 424                 *MessageCount = 1;
 425
 426                 pfnSum = pfnCount;
 427                 pfnLeft = pageCount - pfnCount;
 428
 429                 /* how many pfns can we fit */
 430                 pfnSize = MAX_SIZE_CHANNEL_MESSAGE - sizeof(VMBUS_CHANNEL_GPADL_BODY);
 431                 pfnCount = pfnSize / sizeof(u64);
 432
 433                 /* fill in the body */
 434                 while (pfnLeft)
 435                 {
 436                         if (pfnLeft > pfnCount)
 437                         {
 438                                 pfnCurr = pfnCount;
 439                         }
 440                         else
 441                         {
 442                                 pfnCurr = pfnLeft;
 443                         }
 444
 445                         msgSize = sizeof(struct vmbus_channel_msginfo) + sizeof(VMBUS_CHANNEL_GPADL_BODY) + pfnCurr*sizeof(u64);
 446                         msgBody = kzalloc(msgSize, GFP_KERNEL);
 447                         ASSERT(msgBody);
 448                         msgBody->MessageSize = msgSize;
 449                         (*MessageCount)++;
 450                         gpadlBody = (VMBUS_CHANNEL_GPADL_BODY*)msgBody->Msg;
 451
 452                         /* FIXME: Gpadl is u32 and we are using a pointer which could be 64-bit */
 453                         /* gpadlBody->Gpadl = kbuffer; */
 454                         for (i=0; i<pfnCurr; i++)
 455                         {
 456                                 gpadlBody->Pfn[i] = pfn + pfnSum + i;
 457                         }
 458
 459                         /* add to msg header */
 460                         INSERT_TAIL_LIST(&msgHeader->SubMsgList, &msgBody->MsgListEntry);
 461                         pfnSum += pfnCurr;
 462                         pfnLeft -= pfnCurr;
 463                 }
 464         }
 465         else
 466         {
 467                 /* everything fits in a header */
 468                 msgSize = sizeof(struct vmbus_channel_msginfo) + sizeof(VMBUS_CHANNEL_GPADL_HEADER) + sizeof(GPA_RANGE) + pageCount*sizeof(u64);
 469                 msgHeader = kzalloc(msgSize, GFP_KERNEL);
 470                 msgHeader->MessageSize=msgSize;
 471
 472                 gpaHeader = (VMBUS_CHANNEL_GPADL_HEADER*)msgHeader->Msg;
 473                 gpaHeader->RangeCount = 1;
 474                 gpaHeader->RangeBufLen = sizeof(GPA_RANGE) + pageCount*sizeof(u64);
 475                 gpaHeader->Range[0].ByteOffset = 0;
 476                 gpaHeader->Range[0].ByteCount = Size;
 477                 for (i=0; i<pageCount; i++)
 478                 {
 479                         gpaHeader->Range[0].PfnArray[i] = pfn+i;
 480                 }
 481
 482                 *MsgInfo = msgHeader;
 483                 *MessageCount = 1;
 484         }
 485
 486         return 0;
 487 }
 488
 489
 490 /*++;
 491
 492 Name:
 493         VmbusChannelEstablishGpadl()
 494
 495 Description:
 496         Estabish a GPADL for the specified buffer
 497
 498 --*/
 499 int VmbusChannelEstablishGpadl(struct vmbus_channel *Channel,
 500         void *                  Kbuffer,        /* from kmalloc() */
 501         u32                     Size,           /* page-size multiple */
 502         u32                     *GpadlHandle
 503         )
 504 {
 505         int ret=0;
 506         VMBUS_CHANNEL_GPADL_HEADER* gpadlMsg;
 507         VMBUS_CHANNEL_GPADL_BODY* gpadlBody;
 508         /* VMBUS_CHANNEL_GPADL_CREATED* gpadlCreated; */
 509
 510         struct vmbus_channel_msginfo *msgInfo;
 511         struct vmbus_channel_msginfo *subMsgInfo;
 512
 513         u32 msgCount;
 514         LIST_ENTRY* anchor;
 515         LIST_ENTRY* curr;
 516         u32 nextGpadlHandle;
 517         unsigned long flags;
 518
 519         DPRINT_ENTER(VMBUS);
 520
 521         nextGpadlHandle = atomic_read(&gVmbusConnection.NextGpadlHandle);
 522         atomic_inc(&gVmbusConnection.NextGpadlHandle);
 523
 524         VmbusChannelCreateGpadlHeader(Kbuffer, Size, &msgInfo, &msgCount);
 525         ASSERT(msgInfo != NULL);
 526         ASSERT(msgCount >0);
 527
 528         msgInfo->WaitEvent = osd_WaitEventCreate();
 529         gpadlMsg = (VMBUS_CHANNEL_GPADL_HEADER*)msgInfo->Msg;
 530         gpadlMsg->Header.MessageType = ChannelMessageGpadlHeader;
 531         gpadlMsg->ChildRelId = Channel->OfferMsg.ChildRelId;
 532         gpadlMsg->Gpadl = nextGpadlHandle;
 533
 534         DumpGpadlHeader(gpadlMsg);
 535
 536         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 537         INSERT_TAIL_LIST(&gVmbusConnection.ChannelMsgList, &msgInfo->MsgListEntry);
 538         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 539
 540         DPRINT_DBG(VMBUS, "buffer %p, size %d msg cnt %d", Kbuffer, Size, msgCount);
 541
 542         DPRINT_DBG(VMBUS, "Sending GPADL Header - len %zd", msgInfo->MessageSize - sizeof(*msgInfo));
 543
 544         ret = VmbusPostMessage(gpadlMsg, msgInfo->MessageSize - sizeof(*msgInfo));
 545         if (ret != 0)
 546         {
 547                 DPRINT_ERR(VMBUS, "Unable to open channel - %d", ret);
 548                 goto Cleanup;
 549         }
 550
 551         if (msgCount>1)
 552         {
 553                 ITERATE_LIST_ENTRIES(anchor, curr, &msgInfo->SubMsgList)
 554                 {
 555                         subMsgInfo = (struct vmbus_channel_msginfo*)curr;
 556                         gpadlBody = (VMBUS_CHANNEL_GPADL_BODY*)subMsgInfo->Msg;
 557
 558                         gpadlBody->Header.MessageType = ChannelMessageGpadlBody;
 559                         gpadlBody->Gpadl = nextGpadlHandle;
 560
 561                         DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd", subMsgInfo->MessageSize - sizeof(*subMsgInfo));
 562
 563                         DumpGpadlBody(gpadlBody, subMsgInfo->MessageSize - sizeof(*subMsgInfo));
 564                         ret = VmbusPostMessage(gpadlBody, subMsgInfo->MessageSize - sizeof(*subMsgInfo));
 565                         ASSERT(ret == 0);
 566                 }
 567         }
 568         osd_WaitEventWait(msgInfo->WaitEvent);
 569
 570         /* At this point, we received the gpadl created msg */
 571         DPRINT_DBG(VMBUS, "Received GPADL created (relid %d, status %d handle %x)",
 572                 Channel->OfferMsg.ChildRelId,
 573                 msgInfo->Response.GpadlCreated.CreationStatus,
 574                 gpadlMsg->Gpadl);
 575
 576         *GpadlHandle = gpadlMsg->Gpadl;
 577
 578 Cleanup:
 579         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 580         REMOVE_ENTRY_LIST(&msgInfo->MsgListEntry);
 581         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 582
 583         kfree(msgInfo->WaitEvent);
 584         kfree(msgInfo);
 585
 586         DPRINT_EXIT(VMBUS);
 587
 588         return ret;
 589 }
 590
 591
 592
 593 /*++;
 594
 595 Name:
 596         VmbusChannelTeardownGpadl()
 597
 598 Description:
 599         Teardown the specified GPADL handle
 600
 601 --*/
 602 int VmbusChannelTeardownGpadl(struct vmbus_channel *Channel, u32 GpadlHandle)
 603 {
 604         int ret=0;
 605         VMBUS_CHANNEL_GPADL_TEARDOWN *msg;
 606         struct vmbus_channel_msginfo *info;
 607         unsigned long flags;
 608
 609         DPRINT_ENTER(VMBUS);
 610
 611         ASSERT(GpadlHandle != 0);
 612
 613         info = kmalloc(sizeof(*info) + sizeof(VMBUS_CHANNEL_GPADL_TEARDOWN), GFP_KERNEL);
 614         ASSERT(info != NULL);
 615
 616         info->WaitEvent = osd_WaitEventCreate();
 617
 618         msg = (VMBUS_CHANNEL_GPADL_TEARDOWN*)info->Msg;
 619
 620         msg->Header.MessageType = ChannelMessageGpadlTeardown;
 621     msg->ChildRelId  = Channel->OfferMsg.ChildRelId;
 622     msg->Gpadl       = GpadlHandle;
 623
 624         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 625         INSERT_TAIL_LIST(&gVmbusConnection.ChannelMsgList, &info->MsgListEntry);
 626         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 627
 628         ret = VmbusPostMessage(msg, sizeof(VMBUS_CHANNEL_GPADL_TEARDOWN));
 629         if (ret != 0)
 630         {
 631                 /* TODO: */
 632         }
 633
 634         osd_WaitEventWait(info->WaitEvent);
 635
 636         /* Received a torndown response */
 637         spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
 638         REMOVE_ENTRY_LIST(&info->MsgListEntry);
 639         spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
 640
 641         kfree(info->WaitEvent);
 642         kfree(info);
 643
 644         DPRINT_EXIT(VMBUS);
 645
 646         return ret;
 647 }
 648
 649
 650 /*++
 651
 652 Name:
 653         VmbusChannelClose()
 654
 655 Description:
 656         Close the specified channel
 657
 658 --*/
 659 void VmbusChannelClose(struct vmbus_channel *Channel)
 660 {
 661         int ret=0;
 662         VMBUS_CHANNEL_CLOSE_CHANNEL* msg;
 663         struct vmbus_channel_msginfo *info;
 664         unsigned long flags;
 665
 666         DPRINT_ENTER(VMBUS);
 667
 668         /* Stop callback and cancel the timer asap */
 669         Channel->OnChannelCallback = NULL;
 670         del_timer(&Channel->poll_timer);
 671
 672         /* Send a closing message */
 673         info = kmalloc(sizeof(*info) + sizeof(VMBUS_CHANNEL_CLOSE_CHANNEL), GFP_KERNEL);
 674         ASSERT(info != NULL);
 675
 676         /* info->waitEvent = osd_WaitEventCreate(); */
 677
 678         msg = (VMBUS_CHANNEL_CLOSE_CHANNEL*)info->Msg;
 679         msg->Header.MessageType                         = ChannelMessageCloseChannel;
 680     msg->ChildRelId                                             = Channel->OfferMsg.ChildRelId;
 681
 682         ret = VmbusPostMessage(msg, sizeof(VMBUS_CHANNEL_CLOSE_CHANNEL));
 683         if (ret != 0)
 684         {
 685                 /* TODO: */
 686         }
 687
 688         /* Tear down the gpadl for the channel's ring buffer */
 689         if (Channel->RingBufferGpadlHandle)
 690         {
 691                 VmbusChannelTeardownGpadl(Channel, Channel->RingBufferGpadlHandle);
 692         }
 693
 694         /* TODO: Send a msg to release the childRelId */
 695
 696         /* Cleanup the ring buffers for this channel */
 697         RingBufferCleanup(&Channel->Outbound);
 698         RingBufferCleanup(&Channel->Inbound);
 699
 700         osd_PageFree(Channel->RingBufferPages, Channel->RingBufferPageCount);
 701
 702         kfree(info);
 703
 704
 705         /*
 706          * If we are closing the channel during an error path in
 707          * opening the channel, don't free the channel since the
 708          * caller will free the channel
 709          */
 710
 711         if (Channel->State == CHANNEL_OPEN_STATE)
 712         {
 713                 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
 714                 REMOVE_ENTRY_LIST(&Channel->ListEntry);
 715                 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
 716
 717                 FreeVmbusChannel(Channel);
 718         }
 719
 720         DPRINT_EXIT(VMBUS);
 721 }
 722
 723
 724 /*++
 725
 726 Name:
 727         VmbusChannelSendPacket()
 728
 729 Description:
 730         Send the specified buffer on the given channel
 731
 732 --*/
 733 int VmbusChannelSendPacket(struct vmbus_channel *Channel,
 734         const void *                    Buffer,
 735         u32                             BufferLen,
 736         u64                             RequestId,
 737         VMBUS_PACKET_TYPE       Type,
 738         u32                             Flags
 739 )
 740 {
 741         int ret=0;
 742         VMPACKET_DESCRIPTOR desc;
 743         u32 packetLen = sizeof(VMPACKET_DESCRIPTOR) + BufferLen;
 744         u32 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
 745         struct scatterlist bufferList[3];
 746         u64 alignedData=0;
 747
 748         DPRINT_ENTER(VMBUS);
 749         DPRINT_DBG(VMBUS, "channel %p buffer %p len %d", Channel, Buffer, BufferLen);
 750
 751         DumpVmbusChannel(Channel);
 752
 753         ASSERT((packetLenAligned - packetLen) < sizeof(u64));
 754
 755         /* Setup the descriptor */
 756         desc.Type = Type; /* VmbusPacketTypeDataInBand; */
 757         desc.Flags = Flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
 758         desc.DataOffset8 = sizeof(VMPACKET_DESCRIPTOR) >> 3; /* in 8-bytes granularity */
 759         desc.Length8 = (u16)(packetLenAligned >> 3);
 760         desc.TransactionId = RequestId;
 761
 762         sg_init_table(bufferList,3);
 763         sg_set_buf(&bufferList[0], &desc, sizeof(VMPACKET_DESCRIPTOR));
 764         sg_set_buf(&bufferList[1], Buffer, BufferLen);
 765         sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
 766
 767         ret = RingBufferWrite(
 768                 &Channel->Outbound,
 769                 bufferList,
 770                 3);
 771
 772         /* TODO: We should determine if this is optional */
 773         if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
 774         {
 775                 VmbusChannelSetEvent(Channel);
 776         }
 777
 778         DPRINT_EXIT(VMBUS);
 779
 780         return ret;
 781 }
 782
 783
 784 /*++
 785
 786 Name:
 787         VmbusChannelSendPacketPageBuffer()
 788
 789 Description:
 790         Send a range of single-page buffer packets using a GPADL Direct packet type.
 791
 792 --*/
 793 int VmbusChannelSendPacketPageBuffer(struct vmbus_channel *Channel,
 794         PAGE_BUFFER                     PageBuffers[],
 795         u32                             PageCount,
 796         void *                          Buffer,
 797         u32                             BufferLen,
 798         u64                             RequestId
 799 )
 800 {
 801         int ret=0;
 802         int i=0;
 803         struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER desc;
 804         u32 descSize;
 805         u32 packetLen;
 806         u32 packetLenAligned;
 807         struct scatterlist bufferList[3];
 808         u64 alignedData=0;
 809
 810         DPRINT_ENTER(VMBUS);
 811
 812         ASSERT(PageCount <= MAX_PAGE_BUFFER_COUNT);
 813
 814         DumpVmbusChannel(Channel);
 815
 816         /* Adjust the size down since VMBUS_CHANNEL_PACKET_PAGE_BUFFER is the largest size we support */
 817         descSize = sizeof(struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER) - ((MAX_PAGE_BUFFER_COUNT - PageCount)*sizeof(PAGE_BUFFER));
 818         packetLen = descSize + BufferLen;
 819         packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
 820
 821         ASSERT((packetLenAligned - packetLen) < sizeof(u64));
 822
 823         /* Setup the descriptor */
 824         desc.Type = VmbusPacketTypeDataUsingGpaDirect;
 825         desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
 826         desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */
 827         desc.Length8 = (u16)(packetLenAligned >> 3);
 828         desc.TransactionId = RequestId;
 829         desc.RangeCount = PageCount;
 830
 831         for (i=0; i<PageCount; i++)
 832         {
 833                 desc.Range[i].Length = PageBuffers[i].Length;
 834                 desc.Range[i].Offset = PageBuffers[i].Offset;
 835                 desc.Range[i].Pfn        = PageBuffers[i].Pfn;
 836         }
 837
 838         sg_init_table(bufferList,3);
 839         sg_set_buf(&bufferList[0], &desc, descSize);
 840         sg_set_buf(&bufferList[1], Buffer, BufferLen);
 841         sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
 842
 843         ret = RingBufferWrite(
 844                 &Channel->Outbound,
 845                 bufferList,
 846                 3);
 847
 848         /* TODO: We should determine if this is optional */
 849         if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
 850         {
 851                 VmbusChannelSetEvent(Channel);
 852         }
 853
 854         DPRINT_EXIT(VMBUS);
 855
 856         return ret;
 857 }
 858
 859
 860
 861 /*++
 862
 863 Name:
 864         VmbusChannelSendPacketMultiPageBuffer()
 865
 866 Description:
 867         Send a multi-page buffer packet using a GPADL Direct packet type.
 868
 869 --*/
 870 int VmbusChannelSendPacketMultiPageBuffer(struct vmbus_channel *Channel,
 871         MULTIPAGE_BUFFER        *MultiPageBuffer,
 872         void *                          Buffer,
 873         u32                             BufferLen,
 874         u64                             RequestId
 875 )
 876 {
 877         int ret=0;
 878         struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER desc;
 879         u32 descSize;
 880         u32 packetLen;
 881         u32 packetLenAligned;
 882         struct scatterlist bufferList[3];
 883         u64 alignedData=0;
 884         u32 PfnCount = NUM_PAGES_SPANNED(MultiPageBuffer->Offset, MultiPageBuffer->Length);
 885
 886         DPRINT_ENTER(VMBUS);
 887
 888         DumpVmbusChannel(Channel);
 889
 890         DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u", MultiPageBuffer->Offset, MultiPageBuffer->Length, PfnCount);
 891
 892         ASSERT(PfnCount > 0);
 893         ASSERT(PfnCount <= MAX_MULTIPAGE_BUFFER_COUNT);
 894
 895         /* Adjust the size down since VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER is the largest size we support */
 896         descSize = sizeof(struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER) - ((MAX_MULTIPAGE_BUFFER_COUNT - PfnCount)*sizeof(u64));
 897         packetLen = descSize + BufferLen;
 898         packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
 899
 900         ASSERT((packetLenAligned - packetLen) < sizeof(u64));
 901
 902         /* Setup the descriptor */
 903         desc.Type = VmbusPacketTypeDataUsingGpaDirect;
 904         desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
 905         desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */
 906         desc.Length8 = (u16)(packetLenAligned >> 3);
 907         desc.TransactionId = RequestId;
 908         desc.RangeCount = 1;
 909
 910         desc.Range.Length = MultiPageBuffer->Length;
 911         desc.Range.Offset = MultiPageBuffer->Offset;
 912
 913         memcpy(desc.Range.PfnArray, MultiPageBuffer->PfnArray, PfnCount*sizeof(u64));
 914
 915         sg_init_table(bufferList,3);
 916         sg_set_buf(&bufferList[0], &desc, descSize);
 917         sg_set_buf(&bufferList[1], Buffer, BufferLen);
 918         sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
 919
 920         ret = RingBufferWrite(
 921                 &Channel->Outbound,
 922                 bufferList,
 923                 3);
 924
 925         /* TODO: We should determine if this is optional */
 926         if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
 927         {
 928                 VmbusChannelSetEvent(Channel);
 929         }
 930
 931         DPRINT_EXIT(VMBUS);
 932
 933         return ret;
 934 }
 935
 936
 937 /*++
 938
 939 Name:
 940         VmbusChannelRecvPacket()
 941
 942 Description:
 943         Retrieve the user packet on the specified channel
 944
 945 --*/
 946 /* TODO: Do we ever receive a gpa direct packet other than the ones we send ? */
 947 int VmbusChannelRecvPacket(struct vmbus_channel *Channel,
 948                            void *Buffer,
 949                            u32 BufferLen,
 950                            u32 *BufferActualLen,
 951                            u64 *RequestId)
 952 {
 953         VMPACKET_DESCRIPTOR desc;
 954         u32 packetLen;
 955         u32 userLen;
 956         int ret;
 957         unsigned long flags;
 958
 959         DPRINT_ENTER(VMBUS);
 960
 961         *BufferActualLen = 0;
 962         *RequestId = 0;
 963
 964         spin_lock_irqsave(&Channel->inbound_lock, flags);
 965
 966         ret = RingBufferPeek(&Channel->Inbound, &desc, sizeof(VMPACKET_DESCRIPTOR));
 967         if (ret != 0)
 968         {
 969                 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
 970
 971                 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
 972                 DPRINT_EXIT(VMBUS);
 973                 return 0;
 974         }
 975
 976         /* VmbusChannelClearEvent(Channel); */
 977
 978         packetLen = desc.Length8 << 3;
 979         userLen = packetLen - (desc.DataOffset8 << 3);
 980         /* ASSERT(userLen > 0); */
 981
 982         DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d flag %d tid %llx pktlen %d datalen %d> ",
 983                 Channel,
 984                 Channel->OfferMsg.ChildRelId,
 985                 desc.Type,
 986                 desc.Flags,
 987                 desc.TransactionId, packetLen, userLen);
 988
 989         *BufferActualLen = userLen;
 990
 991         if (userLen > BufferLen)
 992         {
 993                 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
 994
 995                 DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d", BufferLen, userLen);
 996                 DPRINT_EXIT(VMBUS);
 997
 998                 return -1;
 999         }
1000
1001         *RequestId = desc.TransactionId;
1002
1003         /* Copy over the packet to the user buffer */
1004         ret = RingBufferRead(&Channel->Inbound, Buffer, userLen, (desc.DataOffset8 << 3));
1005
1006         spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1007
1008         DPRINT_EXIT(VMBUS);
1009
1010         return 0;
1011 }
1012
1013 /*++
1014
1015 Name:
1016         VmbusChannelRecvPacketRaw()
1017
1018 Description:
1019         Retrieve the raw packet on the specified channel
1020
1021 --*/
1022 int VmbusChannelRecvPacketRaw(struct vmbus_channel *Channel,
1023         void *                          Buffer,
1024         u32                             BufferLen,
1025         u32*                            BufferActualLen,
1026         u64*                            RequestId
1027         )
1028 {
1029         VMPACKET_DESCRIPTOR desc;
1030         u32 packetLen;
1031         u32 userLen;
1032         int ret;
1033         unsigned long flags;
1034
1035         DPRINT_ENTER(VMBUS);
1036
1037         *BufferActualLen = 0;
1038         *RequestId = 0;
1039
1040         spin_lock_irqsave(&Channel->inbound_lock, flags);
1041
1042         ret = RingBufferPeek(&Channel->Inbound, &desc, sizeof(VMPACKET_DESCRIPTOR));
1043         if (ret != 0)
1044         {
1045                 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1046
1047                 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
1048                 DPRINT_EXIT(VMBUS);
1049                 return 0;
1050         }
1051
1052         /* VmbusChannelClearEvent(Channel); */
1053
1054         packetLen = desc.Length8 << 3;
1055         userLen = packetLen - (desc.DataOffset8 << 3);
1056
1057         DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d flag %d tid %llx pktlen %d datalen %d> ",
1058                 Channel,
1059                 Channel->OfferMsg.ChildRelId,
1060                 desc.Type,
1061                 desc.Flags,
1062                 desc.TransactionId, packetLen, userLen);
1063
1064         *BufferActualLen = packetLen;
1065
1066         if (packetLen > BufferLen)
1067         {
1068                 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1069
1070                 DPRINT_ERR(VMBUS, "buffer too small - needed %d bytes but got space for only %d bytes", packetLen, BufferLen);
1071                 DPRINT_EXIT(VMBUS);
1072                 return -2;
1073         }
1074
1075         *RequestId = desc.TransactionId;
1076
1077         /* Copy over the entire packet to the user buffer */
1078         ret = RingBufferRead(&Channel->Inbound, Buffer, packetLen, 0);
1079
1080         spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1081
1082         DPRINT_EXIT(VMBUS);
1083
1084         return 0;
1085 }
1086
1087
1088 /*++
1089
1090 Name:
1091         VmbusChannelOnChannelEvent()
1092
1093 Description:
1094         Channel event callback
1095
1096 --*/
1097 void VmbusChannelOnChannelEvent(struct vmbus_channel *Channel)
1098 {
1099         DumpVmbusChannel(Channel);
1100         ASSERT(Channel->OnChannelCallback);
1101 #ifdef ENABLE_POLLING
1102         del_timer(&Channel->poll_timer);
1103         Channel->OnChannelCallback(Channel->ChannelCallbackContext);
1104         channel->poll_timer.expires(jiffies + usecs_to_jiffies(100);
1105         add_timer(&channel->poll_timer);
1106 #else
1107         Channel->OnChannelCallback(Channel->ChannelCallbackContext);
1108 #endif
1109 }
1110
1111 /*++
1112
1113 Name:
1114         VmbusChannelOnTimer()
1115
1116 Description:
1117         Timer event callback
1118
1119 --*/
1120 void VmbusChannelOnTimer(unsigned long data)
1121 {
1122         struct vmbus_channel *channel = (struct vmbus_channel *)data;
1123
1124         if (channel->OnChannelCallback)
1125         {
1126                 channel->OnChannelCallback(channel->ChannelCallbackContext);
1127 #ifdef ENABLE_POLLING
1128                 channel->poll_timer.expires(jiffies + usecs_to_jiffies(100);
1129                 add_timer(&channel->poll_timer);
1130 #endif
1131         }
1132 }
1133
1134
1135 /*++
1136
1137 Name:
1138         DumpVmbusChannel()
1139
1140 Description:
1141         Dump vmbus channel info to the console
1142
1143 --*/
1144 static void DumpVmbusChannel(struct vmbus_channel *Channel)
1145 {
1146         DPRINT_DBG(VMBUS, "Channel (%d)", Channel->OfferMsg.ChildRelId);
1147         DumpRingInfo(&Channel->Outbound, "Outbound ");
1148         DumpRingInfo(&Channel->Inbound, "Inbound ");
1149 }
1150
1151
1152 /* eof */