drivers/staging/hv/Channel.c

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