3 * Copyright (c) 2009, Microsoft Corporation.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
24 #include <linux/kernel.h>
25 #include "include/osd.h"
26 #include "include/logging.h"
28 #include "VmbusPrivate.h"
30 /* Internal routines */
32 VmbusChannelCreateGpadlHeader(
33 void * Kbuffer, /* must be phys and virt contiguous */
34 u32 Size, /* page-size multiple */
35 VMBUS_CHANNEL_MSGINFO **msgInfo,
41 VMBUS_CHANNEL *Channel
47 VMBUS_CHANNEL *Channel
54 HV_MONITOR_PAGE *MonitorPage
60 DPRINT_DBG(VMBUS, "monitorPage - %p, trigger state - %d", MonitorPage, MonitorPage->TriggerState);
64 DPRINT_DBG(VMBUS, "trigger group (%d) - %llx", i, MonitorPage->TriggerGroup[i].AsUINT64);
71 DPRINT_DBG(VMBUS, "latency (%d)(%d) - %llx", i, j, MonitorPage->Latency[i][j]);
78 DPRINT_DBG(VMBUS, "param-conn id (%d)(%d) - %d", i, j, MonitorPage->Parameter[i][j].ConnectionId.Asu32);
79 DPRINT_DBG(VMBUS, "param-flag (%d)(%d) - %d", i, j, MonitorPage->Parameter[i][j].FlagNumber);
89 VmbusChannelSetEvent()
92 Trigger an event notification on the specified channel.
97 VMBUS_CHANNEL *Channel
100 HV_MONITOR_PAGE *monitorPage;
104 if (Channel->OfferMsg.MonitorAllocated)
106 /* Each u32 represents 32 channels */
107 set_bit(Channel->OfferMsg.ChildRelId & 31,
108 (unsigned long *) gVmbusConnection.SendInterruptPage +
109 (Channel->OfferMsg.ChildRelId >> 5) );
111 monitorPage = (HV_MONITOR_PAGE*)gVmbusConnection.MonitorPages;
112 monitorPage++; /* Get the child to parent monitor page */
114 set_bit(Channel->MonitorBit,
115 (unsigned long *) &monitorPage->TriggerGroup[Channel->MonitorGroup].Pending);
120 VmbusSetEvent(Channel->OfferMsg.ChildRelId);
128 VmbusChannelClearEvent(
129 VMBUS_CHANNEL *Channel
132 HV_MONITOR_PAGE *monitorPage;
136 if (Channel->OfferMsg.MonitorAllocated)
138 /* Each u32 represents 32 channels */
139 clear_bit(Channel->OfferMsg.ChildRelId & 31,
140 (unsigned long *) gVmbusConnection.SendInterruptPage + (Channel->OfferMsg.ChildRelId >> 5));
142 monitorPage = (HV_MONITOR_PAGE*)gVmbusConnection.MonitorPages;
143 monitorPage++; /* Get the child to parent monitor page */
145 clear_bit(Channel->MonitorBit,
146 (unsigned long *) &monitorPage->TriggerGroup[Channel->MonitorGroup].Pending);
156 VmbusChannelGetDebugInfo()
159 Retrieve various channel debug info
163 VmbusChannelGetDebugInfo(
164 VMBUS_CHANNEL *Channel,
165 VMBUS_CHANNEL_DEBUG_INFO *DebugInfo
168 HV_MONITOR_PAGE *monitorPage;
169 u8 monitorGroup = (u8)Channel->OfferMsg.MonitorId / 32;
170 u8 monitorOffset = (u8)Channel->OfferMsg.MonitorId % 32;
171 /* u32 monitorBit = 1 << monitorOffset; */
173 DebugInfo->RelId = Channel->OfferMsg.ChildRelId;
174 DebugInfo->State = Channel->State;
175 memcpy(&DebugInfo->InterfaceType, &Channel->OfferMsg.Offer.InterfaceType, sizeof(GUID));
176 memcpy(&DebugInfo->InterfaceInstance, &Channel->OfferMsg.Offer.InterfaceInstance, sizeof(GUID));
178 monitorPage = (HV_MONITOR_PAGE*)gVmbusConnection.MonitorPages;
180 DebugInfo->MonitorId = Channel->OfferMsg.MonitorId;
182 DebugInfo->ServerMonitorPending = monitorPage->TriggerGroup[monitorGroup].Pending;
183 DebugInfo->ServerMonitorLatency = monitorPage->Latency[monitorGroup][ monitorOffset];
184 DebugInfo->ServerMonitorConnectionId = monitorPage->Parameter[monitorGroup][ monitorOffset].ConnectionId.u.Id;
188 DebugInfo->ClientMonitorPending = monitorPage->TriggerGroup[monitorGroup].Pending;
189 DebugInfo->ClientMonitorLatency = monitorPage->Latency[monitorGroup][ monitorOffset];
190 DebugInfo->ClientMonitorConnectionId = monitorPage->Parameter[monitorGroup][ monitorOffset].ConnectionId.u.Id;
192 RingBufferGetDebugInfo(&Channel->Inbound, &DebugInfo->Inbound);
193 RingBufferGetDebugInfo(&Channel->Outbound, &DebugInfo->Outbound);
203 Open the specified channel.
208 VMBUS_CHANNEL *NewChannel,
209 u32 SendRingBufferSize,
210 u32 RecvRingBufferSize,
213 PFN_CHANNEL_CALLBACK pfnOnChannelCallback,
218 VMBUS_CHANNEL_OPEN_CHANNEL* openMsg;
219 VMBUS_CHANNEL_MSGINFO* openInfo;
225 /* Aligned to page size */
226 ASSERT(!(SendRingBufferSize & (PAGE_SIZE -1)));
227 ASSERT(!(RecvRingBufferSize & (PAGE_SIZE -1)));
229 NewChannel->OnChannelCallback = pfnOnChannelCallback;
230 NewChannel->ChannelCallbackContext = Context;
232 /* Allocate the ring buffer */
233 out = osd_PageAlloc((SendRingBufferSize + RecvRingBufferSize) >> PAGE_SHIFT);
234 /* out = kzalloc(sendRingBufferSize + recvRingBufferSize, GFP_KERNEL); */
236 ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0);
238 in = (void*)((unsigned long)out + SendRingBufferSize);
240 NewChannel->RingBufferPages = out;
241 NewChannel->RingBufferPageCount = (SendRingBufferSize + RecvRingBufferSize) >> PAGE_SHIFT;
243 RingBufferInit(&NewChannel->Outbound, out, SendRingBufferSize);
245 RingBufferInit(&NewChannel->Inbound, in, RecvRingBufferSize);
247 /* Establish the gpadl for the ring buffer */
248 DPRINT_DBG(VMBUS, "Establishing ring buffer's gpadl for channel %p...", NewChannel);
250 NewChannel->RingBufferGpadlHandle = 0;
252 ret = VmbusChannelEstablishGpadl(NewChannel,
253 NewChannel->Outbound.RingBuffer,
254 SendRingBufferSize + RecvRingBufferSize,
255 &NewChannel->RingBufferGpadlHandle);
257 DPRINT_DBG(VMBUS, "channel %p <relid %d gpadl 0x%x send ring %p size %d recv ring %p size %d, downstreamoffset %d>",
259 NewChannel->OfferMsg.ChildRelId,
260 NewChannel->RingBufferGpadlHandle,
261 NewChannel->Outbound.RingBuffer,
262 NewChannel->Outbound.RingSize,
263 NewChannel->Inbound.RingBuffer,
264 NewChannel->Inbound.RingSize,
267 /* Create and init the channel open message */
268 openInfo = kmalloc(sizeof(VMBUS_CHANNEL_MSGINFO) + sizeof(VMBUS_CHANNEL_OPEN_CHANNEL), GFP_KERNEL);
269 ASSERT(openInfo != NULL);
271 openInfo->WaitEvent = osd_WaitEventCreate();
273 openMsg = (VMBUS_CHANNEL_OPEN_CHANNEL*)openInfo->Msg;
274 openMsg->Header.MessageType = ChannelMessageOpenChannel;
275 openMsg->OpenId = NewChannel->OfferMsg.ChildRelId; /* FIXME */
276 openMsg->ChildRelId = NewChannel->OfferMsg.ChildRelId;
277 openMsg->RingBufferGpadlHandle = NewChannel->RingBufferGpadlHandle;
278 ASSERT(openMsg->RingBufferGpadlHandle);
279 openMsg->DownstreamRingBufferPageOffset = SendRingBufferSize >> PAGE_SHIFT;
280 openMsg->ServerContextAreaGpadlHandle = 0; /* TODO */
282 ASSERT(UserDataLen <= MAX_USER_DEFINED_BYTES);
285 memcpy(openMsg->UserData, UserData, UserDataLen);
288 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
289 INSERT_TAIL_LIST(&gVmbusConnection.ChannelMsgList, &openInfo->MsgListEntry);
290 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
292 DPRINT_DBG(VMBUS, "Sending channel open msg...");
294 ret = VmbusPostMessage(openMsg, sizeof(VMBUS_CHANNEL_OPEN_CHANNEL));
297 DPRINT_ERR(VMBUS, "unable to open channel - %d", ret);
301 /* FIXME: Need to time-out here */
302 osd_WaitEventWait(openInfo->WaitEvent);
304 if (openInfo->Response.OpenResult.Status == 0)
306 DPRINT_INFO(VMBUS, "channel <%p> open success!!", NewChannel);
310 DPRINT_INFO(VMBUS, "channel <%p> open failed - %d!!", NewChannel, openInfo->Response.OpenResult.Status);
314 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
315 REMOVE_ENTRY_LIST(&openInfo->MsgListEntry);
316 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
318 kfree(openInfo->WaitEvent);
332 Dump the gpadl body message to the console for debugging purposes.
335 static void DumpGpadlBody(
336 VMBUS_CHANNEL_GPADL_BODY *Gpadl,
342 pfnCount = (Len - sizeof(VMBUS_CHANNEL_GPADL_BODY))/ sizeof(u64);
343 DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", Len, pfnCount);
345 for (i=0; i< pfnCount; i++)
347 DPRINT_DBG(VMBUS, "gpadl body - %d) pfn %llu", i, Gpadl->Pfn[i]);
358 Dump the gpadl header message to the console for debugging purposes.
361 static void DumpGpadlHeader(
362 VMBUS_CHANNEL_GPADL_HEADER *Gpadl
369 DPRINT_DBG(VMBUS, "gpadl header - relid %d, range count %d, range buflen %d",
373 for (i=0; i< Gpadl->RangeCount; i++)
375 pageCount = Gpadl->Range[i].ByteCount >> PAGE_SHIFT;
376 pageCount = (pageCount > 26)? 26 : pageCount;
378 DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d page count %d",
379 i, Gpadl->Range[i].ByteCount, Gpadl->Range[i].ByteOffset, pageCount);
381 for (j=0; j< pageCount; j++)
383 DPRINT_DBG(VMBUS, "%d) pfn %llu", j, Gpadl->Range[i].PfnArray[j]);
391 VmbusChannelCreateGpadlHeader()
394 Creates a gpadl for the specified buffer
398 VmbusChannelCreateGpadlHeader(
399 void * Kbuffer, /* from kmalloc() */
400 u32 Size, /* page-size multiple */
401 VMBUS_CHANNEL_MSGINFO **MsgInfo,
406 unsigned long long pfn;
407 VMBUS_CHANNEL_GPADL_HEADER* gpaHeader;
408 VMBUS_CHANNEL_GPADL_BODY* gpadlBody;
409 VMBUS_CHANNEL_MSGINFO* msgHeader;
410 VMBUS_CHANNEL_MSGINFO* msgBody;
413 int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize;
415 /* ASSERT( (kbuffer & (PAGE_SIZE-1)) == 0); */
416 ASSERT( (Size & (PAGE_SIZE-1)) == 0);
418 pageCount = Size >> PAGE_SHIFT;
419 pfn = virt_to_phys(Kbuffer) >> PAGE_SHIFT;
421 /* do we need a gpadl body msg */
422 pfnSize = MAX_SIZE_CHANNEL_MESSAGE - sizeof(VMBUS_CHANNEL_GPADL_HEADER) - sizeof(GPA_RANGE);
423 pfnCount = pfnSize / sizeof(u64);
425 if (pageCount > pfnCount) /* we need a gpadl body */
427 /* fill in the header */
428 msgSize = sizeof(VMBUS_CHANNEL_MSGINFO) + sizeof(VMBUS_CHANNEL_GPADL_HEADER) + sizeof(GPA_RANGE) + pfnCount*sizeof(u64);
429 msgHeader = kzalloc(msgSize, GFP_KERNEL);
431 INITIALIZE_LIST_HEAD(&msgHeader->SubMsgList);
432 msgHeader->MessageSize=msgSize;
434 gpaHeader = (VMBUS_CHANNEL_GPADL_HEADER*)msgHeader->Msg;
435 gpaHeader->RangeCount = 1;
436 gpaHeader->RangeBufLen = sizeof(GPA_RANGE) + pageCount*sizeof(u64);
437 gpaHeader->Range[0].ByteOffset = 0;
438 gpaHeader->Range[0].ByteCount = Size;
439 for (i=0; i<pfnCount; i++)
441 gpaHeader->Range[0].PfnArray[i] = pfn+i;
443 *MsgInfo = msgHeader;
447 pfnLeft = pageCount - pfnCount;
449 /* how many pfns can we fit */
450 pfnSize = MAX_SIZE_CHANNEL_MESSAGE - sizeof(VMBUS_CHANNEL_GPADL_BODY);
451 pfnCount = pfnSize / sizeof(u64);
453 /* fill in the body */
456 if (pfnLeft > pfnCount)
465 msgSize = sizeof(VMBUS_CHANNEL_MSGINFO) + sizeof(VMBUS_CHANNEL_GPADL_BODY) + pfnCurr*sizeof(u64);
466 msgBody = kzalloc(msgSize, GFP_KERNEL);
468 msgBody->MessageSize = msgSize;
470 gpadlBody = (VMBUS_CHANNEL_GPADL_BODY*)msgBody->Msg;
472 /* FIXME: Gpadl is u32 and we are using a pointer which could be 64-bit */
473 /* gpadlBody->Gpadl = kbuffer; */
474 for (i=0; i<pfnCurr; i++)
476 gpadlBody->Pfn[i] = pfn + pfnSum + i;
479 /* add to msg header */
480 INSERT_TAIL_LIST(&msgHeader->SubMsgList, &msgBody->MsgListEntry);
487 /* everything fits in a header */
488 msgSize = sizeof(VMBUS_CHANNEL_MSGINFO) + sizeof(VMBUS_CHANNEL_GPADL_HEADER) + sizeof(GPA_RANGE) + pageCount*sizeof(u64);
489 msgHeader = kzalloc(msgSize, GFP_KERNEL);
490 msgHeader->MessageSize=msgSize;
492 gpaHeader = (VMBUS_CHANNEL_GPADL_HEADER*)msgHeader->Msg;
493 gpaHeader->RangeCount = 1;
494 gpaHeader->RangeBufLen = sizeof(GPA_RANGE) + pageCount*sizeof(u64);
495 gpaHeader->Range[0].ByteOffset = 0;
496 gpaHeader->Range[0].ByteCount = Size;
497 for (i=0; i<pageCount; i++)
499 gpaHeader->Range[0].PfnArray[i] = pfn+i;
502 *MsgInfo = msgHeader;
513 VmbusChannelEstablishGpadl()
516 Estabish a GPADL for the specified buffer
520 VmbusChannelEstablishGpadl(
521 VMBUS_CHANNEL *Channel,
522 void * Kbuffer, /* from kmalloc() */
523 u32 Size, /* page-size multiple */
528 VMBUS_CHANNEL_GPADL_HEADER* gpadlMsg;
529 VMBUS_CHANNEL_GPADL_BODY* gpadlBody;
530 /* VMBUS_CHANNEL_GPADL_CREATED* gpadlCreated; */
532 VMBUS_CHANNEL_MSGINFO *msgInfo;
533 VMBUS_CHANNEL_MSGINFO *subMsgInfo;
543 nextGpadlHandle = atomic_read(&gVmbusConnection.NextGpadlHandle);
544 atomic_inc(&gVmbusConnection.NextGpadlHandle);
546 VmbusChannelCreateGpadlHeader(Kbuffer, Size, &msgInfo, &msgCount);
547 ASSERT(msgInfo != NULL);
550 msgInfo->WaitEvent = osd_WaitEventCreate();
551 gpadlMsg = (VMBUS_CHANNEL_GPADL_HEADER*)msgInfo->Msg;
552 gpadlMsg->Header.MessageType = ChannelMessageGpadlHeader;
553 gpadlMsg->ChildRelId = Channel->OfferMsg.ChildRelId;
554 gpadlMsg->Gpadl = nextGpadlHandle;
556 DumpGpadlHeader(gpadlMsg);
558 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
559 INSERT_TAIL_LIST(&gVmbusConnection.ChannelMsgList, &msgInfo->MsgListEntry);
560 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
562 DPRINT_DBG(VMBUS, "buffer %p, size %d msg cnt %d", Kbuffer, Size, msgCount);
564 DPRINT_DBG(VMBUS, "Sending GPADL Header - len %zd", msgInfo->MessageSize - sizeof(VMBUS_CHANNEL_MSGINFO));
566 ret = VmbusPostMessage(gpadlMsg, msgInfo->MessageSize - sizeof(VMBUS_CHANNEL_MSGINFO));
569 DPRINT_ERR(VMBUS, "Unable to open channel - %d", ret);
575 ITERATE_LIST_ENTRIES(anchor, curr, &msgInfo->SubMsgList)
577 subMsgInfo = (VMBUS_CHANNEL_MSGINFO*) curr;
578 gpadlBody = (VMBUS_CHANNEL_GPADL_BODY*)subMsgInfo->Msg;
580 gpadlBody->Header.MessageType = ChannelMessageGpadlBody;
581 gpadlBody->Gpadl = nextGpadlHandle;
583 DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd", subMsgInfo->MessageSize - sizeof(VMBUS_CHANNEL_MSGINFO));
585 DumpGpadlBody(gpadlBody, subMsgInfo->MessageSize - sizeof(VMBUS_CHANNEL_MSGINFO));
586 ret = VmbusPostMessage(gpadlBody, subMsgInfo->MessageSize - sizeof(VMBUS_CHANNEL_MSGINFO));
590 osd_WaitEventWait(msgInfo->WaitEvent);
592 /* At this point, we received the gpadl created msg */
593 DPRINT_DBG(VMBUS, "Received GPADL created (relid %d, status %d handle %x)",
594 Channel->OfferMsg.ChildRelId,
595 msgInfo->Response.GpadlCreated.CreationStatus,
598 *GpadlHandle = gpadlMsg->Gpadl;
601 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
602 REMOVE_ENTRY_LIST(&msgInfo->MsgListEntry);
603 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
605 kfree(msgInfo->WaitEvent);
618 VmbusChannelTeardownGpadl()
621 Teardown the specified GPADL handle
625 VmbusChannelTeardownGpadl(
626 VMBUS_CHANNEL *Channel,
631 VMBUS_CHANNEL_GPADL_TEARDOWN *msg;
632 VMBUS_CHANNEL_MSGINFO* info;
637 ASSERT(GpadlHandle != 0);
639 info = kmalloc(sizeof(VMBUS_CHANNEL_MSGINFO) + sizeof(VMBUS_CHANNEL_GPADL_TEARDOWN), GFP_KERNEL);
640 ASSERT(info != NULL);
642 info->WaitEvent = osd_WaitEventCreate();
644 msg = (VMBUS_CHANNEL_GPADL_TEARDOWN*)info->Msg;
646 msg->Header.MessageType = ChannelMessageGpadlTeardown;
647 msg->ChildRelId = Channel->OfferMsg.ChildRelId;
648 msg->Gpadl = GpadlHandle;
650 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
651 INSERT_TAIL_LIST(&gVmbusConnection.ChannelMsgList, &info->MsgListEntry);
652 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
654 ret = VmbusPostMessage(msg, sizeof(VMBUS_CHANNEL_GPADL_TEARDOWN));
660 osd_WaitEventWait(info->WaitEvent);
662 /* Received a torndown response */
663 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
664 REMOVE_ENTRY_LIST(&info->MsgListEntry);
665 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
667 kfree(info->WaitEvent);
682 Close the specified channel
687 VMBUS_CHANNEL *Channel
691 VMBUS_CHANNEL_CLOSE_CHANNEL* msg;
692 VMBUS_CHANNEL_MSGINFO* info;
697 /* Stop callback and cancel the timer asap */
698 Channel->OnChannelCallback = NULL;
699 del_timer(&Channel->poll_timer);
701 /* Send a closing message */
702 info = kmalloc(sizeof(VMBUS_CHANNEL_MSGINFO) + sizeof(VMBUS_CHANNEL_CLOSE_CHANNEL), GFP_KERNEL);
703 ASSERT(info != NULL);
705 /* info->waitEvent = osd_WaitEventCreate(); */
707 msg = (VMBUS_CHANNEL_CLOSE_CHANNEL*)info->Msg;
708 msg->Header.MessageType = ChannelMessageCloseChannel;
709 msg->ChildRelId = Channel->OfferMsg.ChildRelId;
711 ret = VmbusPostMessage(msg, sizeof(VMBUS_CHANNEL_CLOSE_CHANNEL));
717 /* Tear down the gpadl for the channel's ring buffer */
718 if (Channel->RingBufferGpadlHandle)
720 VmbusChannelTeardownGpadl(Channel, Channel->RingBufferGpadlHandle);
723 /* TODO: Send a msg to release the childRelId */
725 /* Cleanup the ring buffers for this channel */
726 RingBufferCleanup(&Channel->Outbound);
727 RingBufferCleanup(&Channel->Inbound);
729 osd_PageFree(Channel->RingBufferPages, Channel->RingBufferPageCount);
735 * If we are closing the channel during an error path in
736 * opening the channel, don't free the channel since the
737 * caller will free the channel
740 if (Channel->State == CHANNEL_OPEN_STATE)
742 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
743 REMOVE_ENTRY_LIST(&Channel->ListEntry);
744 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
746 FreeVmbusChannel(Channel);
756 VmbusChannelSendPacket()
759 Send the specified buffer on the given channel
763 VmbusChannelSendPacket(
764 VMBUS_CHANNEL *Channel,
768 VMBUS_PACKET_TYPE Type,
773 VMPACKET_DESCRIPTOR desc;
774 u32 packetLen = sizeof(VMPACKET_DESCRIPTOR) + BufferLen;
775 u32 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
776 struct scatterlist bufferList[3];
780 DPRINT_DBG(VMBUS, "channel %p buffer %p len %d", Channel, Buffer, BufferLen);
782 DumpVmbusChannel(Channel);
784 ASSERT((packetLenAligned - packetLen) < sizeof(u64));
786 /* Setup the descriptor */
787 desc.Type = Type; /* VmbusPacketTypeDataInBand; */
788 desc.Flags = Flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
789 desc.DataOffset8 = sizeof(VMPACKET_DESCRIPTOR) >> 3; /* in 8-bytes granularity */
790 desc.Length8 = (u16)(packetLenAligned >> 3);
791 desc.TransactionId = RequestId;
793 sg_init_table(bufferList,3);
794 sg_set_buf(&bufferList[0], &desc, sizeof(VMPACKET_DESCRIPTOR));
795 sg_set_buf(&bufferList[1], Buffer, BufferLen);
796 sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
798 ret = RingBufferWrite(
803 /* TODO: We should determine if this is optional */
804 if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
806 VmbusChannelSetEvent(Channel);
818 VmbusChannelSendPacketPageBuffer()
821 Send a range of single-page buffer packets using a GPADL Direct packet type.
825 VmbusChannelSendPacketPageBuffer(
826 VMBUS_CHANNEL *Channel,
827 PAGE_BUFFER PageBuffers[],
836 struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER desc;
839 u32 packetLenAligned;
840 struct scatterlist bufferList[3];
845 ASSERT(PageCount <= MAX_PAGE_BUFFER_COUNT);
847 DumpVmbusChannel(Channel);
849 /* Adjust the size down since VMBUS_CHANNEL_PACKET_PAGE_BUFFER is the largest size we support */
850 descSize = sizeof(struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER) - ((MAX_PAGE_BUFFER_COUNT - PageCount)*sizeof(PAGE_BUFFER));
851 packetLen = descSize + BufferLen;
852 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
854 ASSERT((packetLenAligned - packetLen) < sizeof(u64));
856 /* Setup the descriptor */
857 desc.Type = VmbusPacketTypeDataUsingGpaDirect;
858 desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
859 desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */
860 desc.Length8 = (u16)(packetLenAligned >> 3);
861 desc.TransactionId = RequestId;
862 desc.RangeCount = PageCount;
864 for (i=0; i<PageCount; i++)
866 desc.Range[i].Length = PageBuffers[i].Length;
867 desc.Range[i].Offset = PageBuffers[i].Offset;
868 desc.Range[i].Pfn = PageBuffers[i].Pfn;
871 sg_init_table(bufferList,3);
872 sg_set_buf(&bufferList[0], &desc, descSize);
873 sg_set_buf(&bufferList[1], Buffer, BufferLen);
874 sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
876 ret = RingBufferWrite(
881 /* TODO: We should determine if this is optional */
882 if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
884 VmbusChannelSetEvent(Channel);
897 VmbusChannelSendPacketMultiPageBuffer()
900 Send a multi-page buffer packet using a GPADL Direct packet type.
904 VmbusChannelSendPacketMultiPageBuffer(
905 VMBUS_CHANNEL *Channel,
906 MULTIPAGE_BUFFER *MultiPageBuffer,
913 struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER desc;
916 u32 packetLenAligned;
917 struct scatterlist bufferList[3];
919 u32 PfnCount = NUM_PAGES_SPANNED(MultiPageBuffer->Offset, MultiPageBuffer->Length);
923 DumpVmbusChannel(Channel);
925 DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u", MultiPageBuffer->Offset, MultiPageBuffer->Length, PfnCount);
927 ASSERT(PfnCount > 0);
928 ASSERT(PfnCount <= MAX_MULTIPAGE_BUFFER_COUNT);
930 /* Adjust the size down since VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER is the largest size we support */
931 descSize = sizeof(struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER) - ((MAX_MULTIPAGE_BUFFER_COUNT - PfnCount)*sizeof(u64));
932 packetLen = descSize + BufferLen;
933 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
935 ASSERT((packetLenAligned - packetLen) < sizeof(u64));
937 /* Setup the descriptor */
938 desc.Type = VmbusPacketTypeDataUsingGpaDirect;
939 desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
940 desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */
941 desc.Length8 = (u16)(packetLenAligned >> 3);
942 desc.TransactionId = RequestId;
945 desc.Range.Length = MultiPageBuffer->Length;
946 desc.Range.Offset = MultiPageBuffer->Offset;
948 memcpy(desc.Range.PfnArray, MultiPageBuffer->PfnArray, PfnCount*sizeof(u64));
950 sg_init_table(bufferList,3);
951 sg_set_buf(&bufferList[0], &desc, descSize);
952 sg_set_buf(&bufferList[1], Buffer, BufferLen);
953 sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
955 ret = RingBufferWrite(
960 /* TODO: We should determine if this is optional */
961 if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
963 VmbusChannelSetEvent(Channel);
975 VmbusChannelRecvPacket()
978 Retrieve the user packet on the specified channel
981 /* TODO: Do we ever receive a gpa direct packet other than the ones we send ? */
982 int VmbusChannelRecvPacket(VMBUS_CHANNEL *Channel,
985 u32 *BufferActualLen,
988 VMPACKET_DESCRIPTOR desc;
996 *BufferActualLen = 0;
999 spin_lock_irqsave(&Channel->inbound_lock, flags);
1001 ret = RingBufferPeek(&Channel->Inbound, &desc, sizeof(VMPACKET_DESCRIPTOR));
1004 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1006 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
1011 /* VmbusChannelClearEvent(Channel); */
1013 packetLen = desc.Length8 << 3;
1014 userLen = packetLen - (desc.DataOffset8 << 3);
1015 /* ASSERT(userLen > 0); */
1017 DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d flag %d tid %llx pktlen %d datalen %d> ",
1019 Channel->OfferMsg.ChildRelId,
1022 desc.TransactionId, packetLen, userLen);
1024 *BufferActualLen = userLen;
1026 if (userLen > BufferLen)
1028 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1030 DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d", BufferLen, userLen);
1036 *RequestId = desc.TransactionId;
1038 /* Copy over the packet to the user buffer */
1039 ret = RingBufferRead(&Channel->Inbound, Buffer, userLen, (desc.DataOffset8 << 3));
1041 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1051 VmbusChannelRecvPacketRaw()
1054 Retrieve the raw packet on the specified channel
1058 VmbusChannelRecvPacketRaw(
1059 VMBUS_CHANNEL *Channel,
1062 u32* BufferActualLen,
1066 VMPACKET_DESCRIPTOR desc;
1070 unsigned long flags;
1072 DPRINT_ENTER(VMBUS);
1074 *BufferActualLen = 0;
1077 spin_lock_irqsave(&Channel->inbound_lock, flags);
1079 ret = RingBufferPeek(&Channel->Inbound, &desc, sizeof(VMPACKET_DESCRIPTOR));
1082 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1084 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
1089 /* VmbusChannelClearEvent(Channel); */
1091 packetLen = desc.Length8 << 3;
1092 userLen = packetLen - (desc.DataOffset8 << 3);
1094 DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d flag %d tid %llx pktlen %d datalen %d> ",
1096 Channel->OfferMsg.ChildRelId,
1099 desc.TransactionId, packetLen, userLen);
1101 *BufferActualLen = packetLen;
1103 if (packetLen > BufferLen)
1105 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1107 DPRINT_ERR(VMBUS, "buffer too small - needed %d bytes but got space for only %d bytes", packetLen, BufferLen);
1112 *RequestId = desc.TransactionId;
1114 /* Copy over the entire packet to the user buffer */
1115 ret = RingBufferRead(&Channel->Inbound, Buffer, packetLen, 0);
1117 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
1128 VmbusChannelOnChannelEvent()
1131 Channel event callback
1134 void VmbusChannelOnChannelEvent(VMBUS_CHANNEL *Channel)
1136 DumpVmbusChannel(Channel);
1137 ASSERT(Channel->OnChannelCallback);
1138 #ifdef ENABLE_POLLING
1139 del_timer(&Channel->poll_timer);
1140 Channel->OnChannelCallback(Channel->ChannelCallbackContext);
1141 channel->poll_timer.expires(jiffies + usecs_to_jiffies(100);
1142 add_timer(&channel->poll_timer);
1144 Channel->OnChannelCallback(Channel->ChannelCallbackContext);
1151 VmbusChannelOnTimer()
1154 Timer event callback
1157 void VmbusChannelOnTimer(unsigned long data)
1159 VMBUS_CHANNEL *channel = (VMBUS_CHANNEL*)data;
1161 if (channel->OnChannelCallback)
1163 channel->OnChannelCallback(channel->ChannelCallbackContext);
1164 #ifdef ENABLE_POLLING
1165 channel->poll_timer.expires(jiffies + usecs_to_jiffies(100);
1166 add_timer(&channel->poll_timer);
1178 Dump vmbus channel info to the console
1183 VMBUS_CHANNEL *Channel
1186 DPRINT_DBG(VMBUS, "Channel (%d)", Channel->OfferMsg.ChildRelId);
1187 DumpRingInfo(&Channel->Outbound, "Outbound ");
1188 DumpRingInfo(&Channel->Inbound, "Inbound ");