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