| 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 | void (*OnChannelCallback)(void *context), 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 = OnChannelCallback; |
| 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 | list_add_tail(&openInfo->MsgListEntry, |
| 251 | &gVmbusConnection.ChannelMsgList); |
| 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 | list_del(&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 | INIT_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 | list_add_tail(&msgBody->MsgListEntry, |
| 415 | &msgHeader->SubMsgList); |
| 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 | struct list_head *curr; |
| 461 | u32 nextGpadlHandle; |
| 462 | unsigned long flags; |
| 463 | int ret; |
| 464 | |
| 465 | DPRINT_ENTER(VMBUS); |
| 466 | |
| 467 | nextGpadlHandle = atomic_read(&gVmbusConnection.NextGpadlHandle); |
| 468 | atomic_inc(&gVmbusConnection.NextGpadlHandle); |
| 469 | |
| 470 | VmbusChannelCreateGpadlHeader(Kbuffer, Size, &msgInfo, &msgCount); |
| 471 | ASSERT(msgInfo != NULL); |
| 472 | ASSERT(msgCount > 0); |
| 473 | |
| 474 | msgInfo->WaitEvent = osd_WaitEventCreate(); |
| 475 | gpadlMsg = (struct vmbus_channel_gpadl_header *)msgInfo->Msg; |
| 476 | gpadlMsg->Header.MessageType = ChannelMessageGpadlHeader; |
| 477 | gpadlMsg->ChildRelId = Channel->OfferMsg.ChildRelId; |
| 478 | gpadlMsg->Gpadl = nextGpadlHandle; |
| 479 | |
| 480 | DumpGpadlHeader(gpadlMsg); |
| 481 | |
| 482 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 483 | list_add_tail(&msgInfo->MsgListEntry, |
| 484 | &gVmbusConnection.ChannelMsgList); |
| 485 | |
| 486 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 487 | DPRINT_DBG(VMBUS, "buffer %p, size %d msg cnt %d", |
| 488 | Kbuffer, Size, msgCount); |
| 489 | |
| 490 | DPRINT_DBG(VMBUS, "Sending GPADL Header - len %zd", |
| 491 | msgInfo->MessageSize - sizeof(*msgInfo)); |
| 492 | |
| 493 | ret = VmbusPostMessage(gpadlMsg, msgInfo->MessageSize - |
| 494 | sizeof(*msgInfo)); |
| 495 | if (ret != 0) { |
| 496 | DPRINT_ERR(VMBUS, "Unable to open channel - %d", ret); |
| 497 | goto Cleanup; |
| 498 | } |
| 499 | |
| 500 | if (msgCount > 1) { |
| 501 | list_for_each(curr, &msgInfo->SubMsgList) { |
| 502 | |
| 503 | /* FIXME: should this use list_entry() instead ? */ |
| 504 | subMsgInfo = (struct vmbus_channel_msginfo *)curr; |
| 505 | gpadlBody = |
| 506 | (struct vmbus_channel_gpadl_body *)subMsgInfo->Msg; |
| 507 | |
| 508 | gpadlBody->Header.MessageType = ChannelMessageGpadlBody; |
| 509 | gpadlBody->Gpadl = nextGpadlHandle; |
| 510 | |
| 511 | DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd", |
| 512 | subMsgInfo->MessageSize - |
| 513 | sizeof(*subMsgInfo)); |
| 514 | |
| 515 | DumpGpadlBody(gpadlBody, subMsgInfo->MessageSize - |
| 516 | sizeof(*subMsgInfo)); |
| 517 | ret = VmbusPostMessage(gpadlBody, |
| 518 | subMsgInfo->MessageSize - |
| 519 | sizeof(*subMsgInfo)); |
| 520 | ASSERT(ret == 0); |
| 521 | } |
| 522 | } |
| 523 | osd_WaitEventWait(msgInfo->WaitEvent); |
| 524 | |
| 525 | /* At this point, we received the gpadl created msg */ |
| 526 | DPRINT_DBG(VMBUS, "Received GPADL created " |
| 527 | "(relid %d, status %d handle %x)", |
| 528 | Channel->OfferMsg.ChildRelId, |
| 529 | msgInfo->Response.GpadlCreated.CreationStatus, |
| 530 | gpadlMsg->Gpadl); |
| 531 | |
| 532 | *GpadlHandle = gpadlMsg->Gpadl; |
| 533 | |
| 534 | Cleanup: |
| 535 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 536 | list_del(&msgInfo->MsgListEntry); |
| 537 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 538 | |
| 539 | kfree(msgInfo->WaitEvent); |
| 540 | kfree(msgInfo); |
| 541 | |
| 542 | DPRINT_EXIT(VMBUS); |
| 543 | |
| 544 | return ret; |
| 545 | } |
| 546 | |
| 547 | /** |
| 548 | * VmbusChannelTeardownGpadl -Teardown the specified GPADL handle |
| 549 | */ |
| 550 | int VmbusChannelTeardownGpadl(struct vmbus_channel *Channel, u32 GpadlHandle) |
| 551 | { |
| 552 | struct vmbus_channel_gpadl_teardown *msg; |
| 553 | struct vmbus_channel_msginfo *info; |
| 554 | unsigned long flags; |
| 555 | int ret; |
| 556 | |
| 557 | DPRINT_ENTER(VMBUS); |
| 558 | |
| 559 | ASSERT(GpadlHandle != 0); |
| 560 | |
| 561 | info = kmalloc(sizeof(*info) + |
| 562 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); |
| 563 | ASSERT(info != NULL); |
| 564 | |
| 565 | info->WaitEvent = osd_WaitEventCreate(); |
| 566 | |
| 567 | msg = (struct vmbus_channel_gpadl_teardown *)info->Msg; |
| 568 | |
| 569 | msg->Header.MessageType = ChannelMessageGpadlTeardown; |
| 570 | msg->ChildRelId = Channel->OfferMsg.ChildRelId; |
| 571 | msg->Gpadl = GpadlHandle; |
| 572 | |
| 573 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 574 | list_add_tail(&info->MsgListEntry, |
| 575 | &gVmbusConnection.ChannelMsgList); |
| 576 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 577 | |
| 578 | ret = VmbusPostMessage(msg, |
| 579 | sizeof(struct vmbus_channel_gpadl_teardown)); |
| 580 | if (ret != 0) { |
| 581 | /* TODO: */ |
| 582 | /* something... */ |
| 583 | } |
| 584 | |
| 585 | osd_WaitEventWait(info->WaitEvent); |
| 586 | |
| 587 | /* Received a torndown response */ |
| 588 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 589 | list_del(&info->MsgListEntry); |
| 590 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 591 | |
| 592 | kfree(info->WaitEvent); |
| 593 | kfree(info); |
| 594 | |
| 595 | DPRINT_EXIT(VMBUS); |
| 596 | |
| 597 | return ret; |
| 598 | } |
| 599 | |
| 600 | /** |
| 601 | * VmbusChannelClose - Close the specified channel |
| 602 | */ |
| 603 | void VmbusChannelClose(struct vmbus_channel *Channel) |
| 604 | { |
| 605 | struct vmbus_channel_close_channel *msg; |
| 606 | struct vmbus_channel_msginfo *info; |
| 607 | unsigned long flags; |
| 608 | int ret; |
| 609 | |
| 610 | DPRINT_ENTER(VMBUS); |
| 611 | |
| 612 | /* Stop callback and cancel the timer asap */ |
| 613 | Channel->OnChannelCallback = NULL; |
| 614 | del_timer_sync(&Channel->poll_timer); |
| 615 | |
| 616 | /* Send a closing message */ |
| 617 | info = kmalloc(sizeof(*info) + |
| 618 | sizeof(struct vmbus_channel_close_channel), GFP_KERNEL); |
| 619 | ASSERT(info != NULL); |
| 620 | |
| 621 | /* info->waitEvent = osd_WaitEventCreate(); */ |
| 622 | |
| 623 | msg = (struct vmbus_channel_close_channel *)info->Msg; |
| 624 | msg->Header.MessageType = ChannelMessageCloseChannel; |
| 625 | msg->ChildRelId = Channel->OfferMsg.ChildRelId; |
| 626 | |
| 627 | ret = VmbusPostMessage(msg, sizeof(struct vmbus_channel_close_channel)); |
| 628 | if (ret != 0) { |
| 629 | /* TODO: */ |
| 630 | /* something... */ |
| 631 | } |
| 632 | |
| 633 | /* Tear down the gpadl for the channel's ring buffer */ |
| 634 | if (Channel->RingBufferGpadlHandle) |
| 635 | VmbusChannelTeardownGpadl(Channel, |
| 636 | Channel->RingBufferGpadlHandle); |
| 637 | |
| 638 | /* TODO: Send a msg to release the childRelId */ |
| 639 | |
| 640 | /* Cleanup the ring buffers for this channel */ |
| 641 | RingBufferCleanup(&Channel->Outbound); |
| 642 | RingBufferCleanup(&Channel->Inbound); |
| 643 | |
| 644 | osd_PageFree(Channel->RingBufferPages, Channel->RingBufferPageCount); |
| 645 | |
| 646 | kfree(info); |
| 647 | |
| 648 | /* |
| 649 | * If we are closing the channel during an error path in |
| 650 | * opening the channel, don't free the channel since the |
| 651 | * caller will free the channel |
| 652 | */ |
| 653 | |
| 654 | if (Channel->State == CHANNEL_OPEN_STATE) { |
| 655 | spin_lock_irqsave(&gVmbusConnection.channel_lock, flags); |
| 656 | list_del(&Channel->ListEntry); |
| 657 | spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags); |
| 658 | |
| 659 | FreeVmbusChannel(Channel); |
| 660 | } |
| 661 | |
| 662 | DPRINT_EXIT(VMBUS); |
| 663 | } |
| 664 | |
| 665 | /** |
| 666 | * VmbusChannelSendPacket - Send the specified buffer on the given channel |
| 667 | */ |
| 668 | int VmbusChannelSendPacket(struct vmbus_channel *Channel, const void *Buffer, |
| 669 | u32 BufferLen, u64 RequestId, |
| 670 | enum vmbus_packet_type Type, u32 Flags) |
| 671 | { |
| 672 | struct vmpacket_descriptor desc; |
| 673 | u32 packetLen = sizeof(struct vmpacket_descriptor) + BufferLen; |
| 674 | u32 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64)); |
| 675 | struct scatterlist bufferList[3]; |
| 676 | u64 alignedData = 0; |
| 677 | int ret; |
| 678 | |
| 679 | DPRINT_ENTER(VMBUS); |
| 680 | DPRINT_DBG(VMBUS, "channel %p buffer %p len %d", |
| 681 | Channel, Buffer, BufferLen); |
| 682 | |
| 683 | DumpVmbusChannel(Channel); |
| 684 | |
| 685 | ASSERT((packetLenAligned - packetLen) < sizeof(u64)); |
| 686 | |
| 687 | /* Setup the descriptor */ |
| 688 | desc.Type = Type; /* VmbusPacketTypeDataInBand; */ |
| 689 | desc.Flags = Flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ |
| 690 | /* in 8-bytes granularity */ |
| 691 | desc.DataOffset8 = sizeof(struct vmpacket_descriptor) >> 3; |
| 692 | desc.Length8 = (u16)(packetLenAligned >> 3); |
| 693 | desc.TransactionId = RequestId; |
| 694 | |
| 695 | sg_init_table(bufferList, 3); |
| 696 | sg_set_buf(&bufferList[0], &desc, sizeof(struct vmpacket_descriptor)); |
| 697 | sg_set_buf(&bufferList[1], Buffer, BufferLen); |
| 698 | sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen); |
| 699 | |
| 700 | ret = RingBufferWrite(&Channel->Outbound, bufferList, 3); |
| 701 | |
| 702 | /* TODO: We should determine if this is optional */ |
| 703 | if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound)) |
| 704 | VmbusChannelSetEvent(Channel); |
| 705 | |
| 706 | DPRINT_EXIT(VMBUS); |
| 707 | |
| 708 | return ret; |
| 709 | } |
| 710 | |
| 711 | /** |
| 712 | * VmbusChannelSendPacketPageBuffer - Send a range of single-page buffer packets using a GPADL Direct packet type. |
| 713 | */ |
| 714 | int VmbusChannelSendPacketPageBuffer(struct vmbus_channel *Channel, |
| 715 | struct hv_page_buffer PageBuffers[], |
| 716 | u32 PageCount, void *Buffer, u32 BufferLen, |
| 717 | u64 RequestId) |
| 718 | { |
| 719 | int ret; |
| 720 | int i; |
| 721 | struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER desc; |
| 722 | u32 descSize; |
| 723 | u32 packetLen; |
| 724 | u32 packetLenAligned; |
| 725 | struct scatterlist bufferList[3]; |
| 726 | u64 alignedData = 0; |
| 727 | |
| 728 | DPRINT_ENTER(VMBUS); |
| 729 | |
| 730 | ASSERT(PageCount <= MAX_PAGE_BUFFER_COUNT); |
| 731 | |
| 732 | DumpVmbusChannel(Channel); |
| 733 | |
| 734 | /* |
| 735 | * Adjust the size down since VMBUS_CHANNEL_PACKET_PAGE_BUFFER is the |
| 736 | * largest size we support |
| 737 | */ |
| 738 | descSize = sizeof(struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER) - |
| 739 | ((MAX_PAGE_BUFFER_COUNT - PageCount) * |
| 740 | sizeof(struct hv_page_buffer)); |
| 741 | packetLen = descSize + BufferLen; |
| 742 | packetLenAligned = ALIGN_UP(packetLen, sizeof(u64)); |
| 743 | |
| 744 | ASSERT((packetLenAligned - packetLen) < sizeof(u64)); |
| 745 | |
| 746 | /* Setup the descriptor */ |
| 747 | desc.Type = VmbusPacketTypeDataUsingGpaDirect; |
| 748 | desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
| 749 | desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */ |
| 750 | desc.Length8 = (u16)(packetLenAligned >> 3); |
| 751 | desc.TransactionId = RequestId; |
| 752 | desc.RangeCount = PageCount; |
| 753 | |
| 754 | for (i = 0; i < PageCount; i++) { |
| 755 | desc.Range[i].Length = PageBuffers[i].Length; |
| 756 | desc.Range[i].Offset = PageBuffers[i].Offset; |
| 757 | desc.Range[i].Pfn = PageBuffers[i].Pfn; |
| 758 | } |
| 759 | |
| 760 | sg_init_table(bufferList, 3); |
| 761 | sg_set_buf(&bufferList[0], &desc, descSize); |
| 762 | sg_set_buf(&bufferList[1], Buffer, BufferLen); |
| 763 | sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen); |
| 764 | |
| 765 | ret = RingBufferWrite(&Channel->Outbound, bufferList, 3); |
| 766 | |
| 767 | /* TODO: We should determine if this is optional */ |
| 768 | if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound)) |
| 769 | VmbusChannelSetEvent(Channel); |
| 770 | |
| 771 | DPRINT_EXIT(VMBUS); |
| 772 | |
| 773 | return ret; |
| 774 | } |
| 775 | |
| 776 | /** |
| 777 | * VmbusChannelSendPacketMultiPageBuffer - Send a multi-page buffer packet using a GPADL Direct packet type. |
| 778 | */ |
| 779 | int VmbusChannelSendPacketMultiPageBuffer(struct vmbus_channel *Channel, |
| 780 | struct hv_multipage_buffer *MultiPageBuffer, |
| 781 | void *Buffer, u32 BufferLen, u64 RequestId) |
| 782 | { |
| 783 | int ret; |
| 784 | struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER desc; |
| 785 | u32 descSize; |
| 786 | u32 packetLen; |
| 787 | u32 packetLenAligned; |
| 788 | struct scatterlist bufferList[3]; |
| 789 | u64 alignedData = 0; |
| 790 | u32 PfnCount = NUM_PAGES_SPANNED(MultiPageBuffer->Offset, |
| 791 | MultiPageBuffer->Length); |
| 792 | |
| 793 | DPRINT_ENTER(VMBUS); |
| 794 | |
| 795 | DumpVmbusChannel(Channel); |
| 796 | |
| 797 | DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u", |
| 798 | MultiPageBuffer->Offset, MultiPageBuffer->Length, PfnCount); |
| 799 | |
| 800 | ASSERT(PfnCount > 0); |
| 801 | ASSERT(PfnCount <= MAX_MULTIPAGE_BUFFER_COUNT); |
| 802 | |
| 803 | /* |
| 804 | * Adjust the size down since VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER is |
| 805 | * the largest size we support |
| 806 | */ |
| 807 | descSize = sizeof(struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER) - |
| 808 | ((MAX_MULTIPAGE_BUFFER_COUNT - PfnCount) * |
| 809 | sizeof(u64)); |
| 810 | packetLen = descSize + BufferLen; |
| 811 | packetLenAligned = ALIGN_UP(packetLen, sizeof(u64)); |
| 812 | |
| 813 | ASSERT((packetLenAligned - packetLen) < sizeof(u64)); |
| 814 | |
| 815 | /* Setup the descriptor */ |
| 816 | desc.Type = VmbusPacketTypeDataUsingGpaDirect; |
| 817 | desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
| 818 | desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */ |
| 819 | desc.Length8 = (u16)(packetLenAligned >> 3); |
| 820 | desc.TransactionId = RequestId; |
| 821 | desc.RangeCount = 1; |
| 822 | |
| 823 | desc.Range.Length = MultiPageBuffer->Length; |
| 824 | desc.Range.Offset = MultiPageBuffer->Offset; |
| 825 | |
| 826 | memcpy(desc.Range.PfnArray, MultiPageBuffer->PfnArray, |
| 827 | PfnCount * sizeof(u64)); |
| 828 | |
| 829 | sg_init_table(bufferList, 3); |
| 830 | sg_set_buf(&bufferList[0], &desc, descSize); |
| 831 | sg_set_buf(&bufferList[1], Buffer, BufferLen); |
| 832 | sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen); |
| 833 | |
| 834 | ret = RingBufferWrite(&Channel->Outbound, bufferList, 3); |
| 835 | |
| 836 | /* TODO: We should determine if this is optional */ |
| 837 | if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound)) |
| 838 | VmbusChannelSetEvent(Channel); |
| 839 | |
| 840 | DPRINT_EXIT(VMBUS); |
| 841 | |
| 842 | return ret; |
| 843 | } |
| 844 | |
| 845 | /** |
| 846 | * VmbusChannelRecvPacket - Retrieve the user packet on the specified channel |
| 847 | */ |
| 848 | /* TODO: Do we ever receive a gpa direct packet other than the ones we send ? */ |
| 849 | int VmbusChannelRecvPacket(struct vmbus_channel *Channel, void *Buffer, |
| 850 | u32 BufferLen, u32 *BufferActualLen, u64 *RequestId) |
| 851 | { |
| 852 | struct vmpacket_descriptor desc; |
| 853 | u32 packetLen; |
| 854 | u32 userLen; |
| 855 | int ret; |
| 856 | unsigned long flags; |
| 857 | |
| 858 | DPRINT_ENTER(VMBUS); |
| 859 | |
| 860 | *BufferActualLen = 0; |
| 861 | *RequestId = 0; |
| 862 | |
| 863 | spin_lock_irqsave(&Channel->inbound_lock, flags); |
| 864 | |
| 865 | ret = RingBufferPeek(&Channel->Inbound, &desc, |
| 866 | sizeof(struct vmpacket_descriptor)); |
| 867 | if (ret != 0) { |
| 868 | spin_unlock_irqrestore(&Channel->inbound_lock, flags); |
| 869 | |
| 870 | /* DPRINT_DBG(VMBUS, "nothing to read!!"); */ |
| 871 | DPRINT_EXIT(VMBUS); |
| 872 | return 0; |
| 873 | } |
| 874 | |
| 875 | /* VmbusChannelClearEvent(Channel); */ |
| 876 | |
| 877 | packetLen = desc.Length8 << 3; |
| 878 | userLen = packetLen - (desc.DataOffset8 << 3); |
| 879 | /* ASSERT(userLen > 0); */ |
| 880 | |
| 881 | DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d " |
| 882 | "flag %d tid %llx pktlen %d datalen %d> ", |
| 883 | Channel, Channel->OfferMsg.ChildRelId, desc.Type, |
| 884 | desc.Flags, desc.TransactionId, packetLen, userLen); |
| 885 | |
| 886 | *BufferActualLen = userLen; |
| 887 | |
| 888 | if (userLen > BufferLen) { |
| 889 | spin_unlock_irqrestore(&Channel->inbound_lock, flags); |
| 890 | |
| 891 | DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d", |
| 892 | BufferLen, userLen); |
| 893 | DPRINT_EXIT(VMBUS); |
| 894 | |
| 895 | return -1; |
| 896 | } |
| 897 | |
| 898 | *RequestId = desc.TransactionId; |
| 899 | |
| 900 | /* Copy over the packet to the user buffer */ |
| 901 | ret = RingBufferRead(&Channel->Inbound, Buffer, userLen, |
| 902 | (desc.DataOffset8 << 3)); |
| 903 | |
| 904 | spin_unlock_irqrestore(&Channel->inbound_lock, flags); |
| 905 | |
| 906 | DPRINT_EXIT(VMBUS); |
| 907 | |
| 908 | return 0; |
| 909 | } |
| 910 | |
| 911 | /** |
| 912 | * VmbusChannelRecvPacketRaw - Retrieve the raw packet on the specified channel |
| 913 | */ |
| 914 | int VmbusChannelRecvPacketRaw(struct vmbus_channel *Channel, void *Buffer, |
| 915 | u32 BufferLen, u32 *BufferActualLen, |
| 916 | u64 *RequestId) |
| 917 | { |
| 918 | struct vmpacket_descriptor desc; |
| 919 | u32 packetLen; |
| 920 | u32 userLen; |
| 921 | int ret; |
| 922 | unsigned long flags; |
| 923 | |
| 924 | DPRINT_ENTER(VMBUS); |
| 925 | |
| 926 | *BufferActualLen = 0; |
| 927 | *RequestId = 0; |
| 928 | |
| 929 | spin_lock_irqsave(&Channel->inbound_lock, flags); |
| 930 | |
| 931 | ret = RingBufferPeek(&Channel->Inbound, &desc, |
| 932 | sizeof(struct vmpacket_descriptor)); |
| 933 | if (ret != 0) { |
| 934 | spin_unlock_irqrestore(&Channel->inbound_lock, flags); |
| 935 | |
| 936 | /* DPRINT_DBG(VMBUS, "nothing to read!!"); */ |
| 937 | DPRINT_EXIT(VMBUS); |
| 938 | return 0; |
| 939 | } |
| 940 | |
| 941 | /* VmbusChannelClearEvent(Channel); */ |
| 942 | |
| 943 | packetLen = desc.Length8 << 3; |
| 944 | userLen = packetLen - (desc.DataOffset8 << 3); |
| 945 | |
| 946 | DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d " |
| 947 | "flag %d tid %llx pktlen %d datalen %d> ", |
| 948 | Channel, Channel->OfferMsg.ChildRelId, desc.Type, |
| 949 | desc.Flags, desc.TransactionId, packetLen, userLen); |
| 950 | |
| 951 | *BufferActualLen = packetLen; |
| 952 | |
| 953 | if (packetLen > BufferLen) { |
| 954 | spin_unlock_irqrestore(&Channel->inbound_lock, flags); |
| 955 | |
| 956 | DPRINT_ERR(VMBUS, "buffer too small - needed %d bytes but " |
| 957 | "got space for only %d bytes", packetLen, BufferLen); |
| 958 | DPRINT_EXIT(VMBUS); |
| 959 | return -2; |
| 960 | } |
| 961 | |
| 962 | *RequestId = desc.TransactionId; |
| 963 | |
| 964 | /* Copy over the entire packet to the user buffer */ |
| 965 | ret = RingBufferRead(&Channel->Inbound, Buffer, packetLen, 0); |
| 966 | |
| 967 | spin_unlock_irqrestore(&Channel->inbound_lock, flags); |
| 968 | |
| 969 | DPRINT_EXIT(VMBUS); |
| 970 | |
| 971 | return 0; |
| 972 | } |
| 973 | |
| 974 | /** |
| 975 | * VmbusChannelOnChannelEvent - Channel event callback |
| 976 | */ |
| 977 | void VmbusChannelOnChannelEvent(struct vmbus_channel *Channel) |
| 978 | { |
| 979 | DumpVmbusChannel(Channel); |
| 980 | ASSERT(Channel->OnChannelCallback); |
| 981 | |
| 982 | Channel->OnChannelCallback(Channel->ChannelCallbackContext); |
| 983 | |
| 984 | mod_timer(&Channel->poll_timer, jiffies + usecs_to_jiffies(100)); |
| 985 | } |
| 986 | |
| 987 | /** |
| 988 | * VmbusChannelOnTimer - Timer event callback |
| 989 | */ |
| 990 | void VmbusChannelOnTimer(unsigned long data) |
| 991 | { |
| 992 | struct vmbus_channel *channel = (struct vmbus_channel *)data; |
| 993 | |
| 994 | if (channel->OnChannelCallback) |
| 995 | channel->OnChannelCallback(channel->ChannelCallbackContext); |
| 996 | } |
| 997 | |
| 998 | /** |
| 999 | * DumpVmbusChannel - Dump vmbus channel info to the console |
| 1000 | */ |
| 1001 | static void DumpVmbusChannel(struct vmbus_channel *Channel) |
| 1002 | { |
| 1003 | DPRINT_DBG(VMBUS, "Channel (%d)", Channel->OfferMsg.ChildRelId); |
| 1004 | DumpRingInfo(&Channel->Outbound, "Outbound "); |
| 1005 | DumpRingInfo(&Channel->Inbound, "Inbound "); |
| 1006 | } |