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