2 * Copyright (c) 2009, Microsoft Corporation.
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.
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
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.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
21 #include <linux/kernel.h>
23 #include <linux/slab.h>
26 #include "VmbusPrivate.h"
28 /* Internal routines */
29 static int VmbusChannelCreateGpadlHeader(
30 void *Kbuffer, /* must be phys and virt contiguous */
31 u32 Size, /* page-size multiple */
32 struct vmbus_channel_msginfo **msgInfo,
34 static void DumpVmbusChannel(struct vmbus_channel *channel);
35 static void VmbusChannelSetEvent(struct vmbus_channel *channel);
39 static void DumpMonitorPage(struct hv_monitor_page *MonitorPage)
44 DPRINT_DBG(VMBUS, "monitorPage - %p, trigger state - %d",
45 MonitorPage, MonitorPage->TriggerState);
47 for (i = 0; i < 4; i++)
48 DPRINT_DBG(VMBUS, "trigger group (%d) - %llx", i,
49 MonitorPage->TriggerGroup[i].AsUINT64);
51 for (i = 0; i < 4; i++) {
52 for (j = 0; j < 32; j++) {
53 DPRINT_DBG(VMBUS, "latency (%d)(%d) - %llx", i, j,
54 MonitorPage->Latency[i][j]);
57 for (i = 0; i < 4; i++) {
58 for (j = 0; j < 32; j++) {
59 DPRINT_DBG(VMBUS, "param-conn id (%d)(%d) - %d", i, j,
60 MonitorPage->Parameter[i][j].ConnectionId.Asu32);
61 DPRINT_DBG(VMBUS, "param-flag (%d)(%d) - %d", i, j,
62 MonitorPage->Parameter[i][j].FlagNumber);
69 * VmbusChannelSetEvent - Trigger an event notification on the specified channel.
71 static void VmbusChannelSetEvent(struct vmbus_channel *Channel)
73 struct hv_monitor_page *monitorPage;
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));
83 monitorPage = gVmbusConnection.MonitorPages;
84 monitorPage++; /* Get the child to parent monitor page */
86 set_bit(Channel->MonitorBit,
87 (unsigned long *)&monitorPage->TriggerGroup
88 [Channel->MonitorGroup].Pending);
91 VmbusSetEvent(Channel->OfferMsg.ChildRelId);
98 static void VmbusChannelClearEvent(struct vmbus_channel *channel)
100 struct hv_monitor_page *monitorPage;
104 if (Channel->OfferMsg.MonitorAllocated) {
105 /* Each u32 represents 32 channels */
106 clear_bit(Channel->OfferMsg.ChildRelId & 31,
107 (unsigned long *)gVmbusConnection.SendInterruptPage +
108 (Channel->OfferMsg.ChildRelId >> 5));
111 (struct hv_monitor_page *)gVmbusConnection.MonitorPages;
112 monitorPage++; /* Get the child to parent monitor page */
114 clear_bit(Channel->MonitorBit,
115 (unsigned long *)&monitorPage->TriggerGroup
116 [Channel->MonitorGroup].Pending);
124 * VmbusChannelGetDebugInfo -Retrieve various channel debug info
126 void VmbusChannelGetDebugInfo(struct vmbus_channel *Channel,
127 struct vmbus_channel_debug_info *DebugInfo)
129 struct hv_monitor_page *monitorPage;
130 u8 monitorGroup = (u8)Channel->OfferMsg.MonitorId / 32;
131 u8 monitorOffset = (u8)Channel->OfferMsg.MonitorId % 32;
132 /* u32 monitorBit = 1 << monitorOffset; */
134 DebugInfo->RelId = Channel->OfferMsg.ChildRelId;
135 DebugInfo->State = Channel->State;
136 memcpy(&DebugInfo->InterfaceType,
137 &Channel->OfferMsg.Offer.InterfaceType, sizeof(struct hv_guid));
138 memcpy(&DebugInfo->InterfaceInstance,
139 &Channel->OfferMsg.Offer.InterfaceInstance,
140 sizeof(struct hv_guid));
142 monitorPage = (struct hv_monitor_page *)gVmbusConnection.MonitorPages;
144 DebugInfo->MonitorId = Channel->OfferMsg.MonitorId;
146 DebugInfo->ServerMonitorPending =
147 monitorPage->TriggerGroup[monitorGroup].Pending;
148 DebugInfo->ServerMonitorLatency =
149 monitorPage->Latency[monitorGroup][monitorOffset];
150 DebugInfo->ServerMonitorConnectionId =
151 monitorPage->Parameter[monitorGroup]
152 [monitorOffset].ConnectionId.u.Id;
156 DebugInfo->ClientMonitorPending =
157 monitorPage->TriggerGroup[monitorGroup].Pending;
158 DebugInfo->ClientMonitorLatency =
159 monitorPage->Latency[monitorGroup][monitorOffset];
160 DebugInfo->ClientMonitorConnectionId =
161 monitorPage->Parameter[monitorGroup]
162 [monitorOffset].ConnectionId.u.Id;
164 RingBufferGetDebugInfo(&Channel->Inbound, &DebugInfo->Inbound);
165 RingBufferGetDebugInfo(&Channel->Outbound, &DebugInfo->Outbound);
169 * VmbusChannelOpen - Open the specified channel.
171 int VmbusChannelOpen(struct vmbus_channel *NewChannel, u32 SendRingBufferSize,
172 u32 RecvRingBufferSize, void *UserData, u32 UserDataLen,
173 void (*OnChannelCallback)(void *context), void *Context)
175 struct vmbus_channel_open_channel *openMsg;
176 struct vmbus_channel_msginfo *openInfo;
183 /* Aligned to page size */
184 ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1)));
185 ASSERT(!(RecvRingBufferSize & (PAGE_SIZE - 1)));
187 NewChannel->OnChannelCallback = OnChannelCallback;
188 NewChannel->ChannelCallbackContext = Context;
190 /* Allocate the ring buffer */
191 out = osd_PageAlloc((SendRingBufferSize + RecvRingBufferSize)
194 ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0);
196 in = (void *)((unsigned long)out + SendRingBufferSize);
198 NewChannel->RingBufferPages = out;
199 NewChannel->RingBufferPageCount = (SendRingBufferSize +
200 RecvRingBufferSize) >> PAGE_SHIFT;
202 RingBufferInit(&NewChannel->Outbound, out, SendRingBufferSize);
204 RingBufferInit(&NewChannel->Inbound, in, RecvRingBufferSize);
206 /* Establish the gpadl for the ring buffer */
207 DPRINT_DBG(VMBUS, "Establishing ring buffer's gpadl for channel %p...",
210 NewChannel->RingBufferGpadlHandle = 0;
212 ret = VmbusChannelEstablishGpadl(NewChannel,
213 NewChannel->Outbound.RingBuffer,
216 &NewChannel->RingBufferGpadlHandle);
218 DPRINT_DBG(VMBUS, "channel %p <relid %d gpadl 0x%x send ring %p "
219 "size %d recv ring %p size %d, downstreamoffset %d>",
220 NewChannel, NewChannel->OfferMsg.ChildRelId,
221 NewChannel->RingBufferGpadlHandle,
222 NewChannel->Outbound.RingBuffer,
223 NewChannel->Outbound.RingSize,
224 NewChannel->Inbound.RingBuffer,
225 NewChannel->Inbound.RingSize,
228 /* Create and init the channel open message */
229 openInfo = kmalloc(sizeof(*openInfo) +
230 sizeof(struct vmbus_channel_open_channel),
232 ASSERT(openInfo != NULL);
234 openInfo->WaitEvent = osd_WaitEventCreate();
236 openMsg = (struct vmbus_channel_open_channel *)openInfo->Msg;
237 openMsg->Header.MessageType = ChannelMessageOpenChannel;
238 openMsg->OpenId = NewChannel->OfferMsg.ChildRelId; /* FIXME */
239 openMsg->ChildRelId = NewChannel->OfferMsg.ChildRelId;
240 openMsg->RingBufferGpadlHandle = NewChannel->RingBufferGpadlHandle;
241 ASSERT(openMsg->RingBufferGpadlHandle);
242 openMsg->DownstreamRingBufferPageOffset = SendRingBufferSize >>
244 openMsg->ServerContextAreaGpadlHandle = 0; /* TODO */
246 ASSERT(UserDataLen <= MAX_USER_DEFINED_BYTES);
248 memcpy(openMsg->UserData, UserData, UserDataLen);
250 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
251 list_add_tail(&openInfo->MsgListEntry,
252 &gVmbusConnection.ChannelMsgList);
253 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
255 DPRINT_DBG(VMBUS, "Sending channel open msg...");
257 ret = VmbusPostMessage(openMsg,
258 sizeof(struct vmbus_channel_open_channel));
260 DPRINT_ERR(VMBUS, "unable to open channel - %d", ret);
264 /* FIXME: Need to time-out here */
265 osd_WaitEventWait(openInfo->WaitEvent);
267 if (openInfo->Response.OpenResult.Status == 0)
268 DPRINT_INFO(VMBUS, "channel <%p> open success!!", NewChannel);
270 DPRINT_INFO(VMBUS, "channel <%p> open failed - %d!!",
271 NewChannel, openInfo->Response.OpenResult.Status);
274 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
275 list_del(&openInfo->MsgListEntry);
276 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
278 kfree(openInfo->WaitEvent);
287 * DumpGpadlBody - Dump the gpadl body message to the console for debugging purposes.
289 static void DumpGpadlBody(struct vmbus_channel_gpadl_body *Gpadl, u32 Len)
294 pfnCount = (Len - sizeof(struct vmbus_channel_gpadl_body)) /
296 DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", Len, pfnCount);
298 for (i = 0; i < pfnCount; i++)
299 DPRINT_DBG(VMBUS, "gpadl body - %d) pfn %llu",
304 * DumpGpadlHeader - Dump the gpadl header message to the console for debugging purposes.
306 static void DumpGpadlHeader(struct vmbus_channel_gpadl_header *Gpadl)
312 "gpadl header - relid %d, range count %d, range buflen %d",
313 Gpadl->ChildRelId, Gpadl->RangeCount, Gpadl->RangeBufLen);
314 for (i = 0; i < Gpadl->RangeCount; i++) {
315 pageCount = Gpadl->Range[i].ByteCount >> PAGE_SHIFT;
316 pageCount = (pageCount > 26) ? 26 : pageCount;
318 DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d "
319 "page count %d", i, Gpadl->Range[i].ByteCount,
320 Gpadl->Range[i].ByteOffset, pageCount);
322 for (j = 0; j < pageCount; j++)
323 DPRINT_DBG(VMBUS, "%d) pfn %llu", j,
324 Gpadl->Range[i].PfnArray[j]);
329 * VmbusChannelCreateGpadlHeader - Creates a gpadl for the specified buffer
331 static int VmbusChannelCreateGpadlHeader(void *Kbuffer, u32 Size,
332 struct vmbus_channel_msginfo **MsgInfo,
337 unsigned long long pfn;
338 struct vmbus_channel_gpadl_header *gpaHeader;
339 struct vmbus_channel_gpadl_body *gpadlBody;
340 struct vmbus_channel_msginfo *msgHeader;
341 struct vmbus_channel_msginfo *msgBody;
344 int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize;
346 /* ASSERT((kbuffer & (PAGE_SIZE-1)) == 0); */
347 ASSERT((Size & (PAGE_SIZE-1)) == 0);
349 pageCount = Size >> PAGE_SHIFT;
350 pfn = virt_to_phys(Kbuffer) >> PAGE_SHIFT;
352 /* do we need a gpadl body msg */
353 pfnSize = MAX_SIZE_CHANNEL_MESSAGE -
354 sizeof(struct vmbus_channel_gpadl_header) -
355 sizeof(struct gpa_range);
356 pfnCount = pfnSize / sizeof(u64);
358 if (pageCount > pfnCount) {
359 /* we need a gpadl body */
360 /* fill in the header */
361 msgSize = sizeof(struct vmbus_channel_msginfo) +
362 sizeof(struct vmbus_channel_gpadl_header) +
363 sizeof(struct gpa_range) + pfnCount * sizeof(u64);
364 msgHeader = kzalloc(msgSize, GFP_KERNEL);
366 INIT_LIST_HEAD(&msgHeader->SubMsgList);
367 msgHeader->MessageSize = msgSize;
369 gpaHeader = (struct vmbus_channel_gpadl_header *)msgHeader->Msg;
370 gpaHeader->RangeCount = 1;
371 gpaHeader->RangeBufLen = sizeof(struct gpa_range) +
372 pageCount * sizeof(u64);
373 gpaHeader->Range[0].ByteOffset = 0;
374 gpaHeader->Range[0].ByteCount = Size;
375 for (i = 0; i < pfnCount; i++)
376 gpaHeader->Range[0].PfnArray[i] = pfn+i;
377 *MsgInfo = msgHeader;
381 pfnLeft = pageCount - pfnCount;
383 /* how many pfns can we fit */
384 pfnSize = MAX_SIZE_CHANNEL_MESSAGE -
385 sizeof(struct vmbus_channel_gpadl_body);
386 pfnCount = pfnSize / sizeof(u64);
388 /* fill in the body */
390 if (pfnLeft > pfnCount)
395 msgSize = sizeof(struct vmbus_channel_msginfo) +
396 sizeof(struct vmbus_channel_gpadl_body) +
397 pfnCurr * sizeof(u64);
398 msgBody = kzalloc(msgSize, GFP_KERNEL);
400 msgBody->MessageSize = msgSize;
403 (struct vmbus_channel_gpadl_body *)msgBody->Msg;
407 * Gpadl is u32 and we are using a pointer which could
410 /* gpadlBody->Gpadl = kbuffer; */
411 for (i = 0; i < pfnCurr; i++)
412 gpadlBody->Pfn[i] = pfn + pfnSum + i;
414 /* add to msg header */
415 list_add_tail(&msgBody->MsgListEntry,
416 &msgHeader->SubMsgList);
421 /* everything fits in a header */
422 msgSize = sizeof(struct vmbus_channel_msginfo) +
423 sizeof(struct vmbus_channel_gpadl_header) +
424 sizeof(struct gpa_range) + pageCount * sizeof(u64);
425 msgHeader = kzalloc(msgSize, GFP_KERNEL);
426 msgHeader->MessageSize = msgSize;
428 gpaHeader = (struct vmbus_channel_gpadl_header *)msgHeader->Msg;
429 gpaHeader->RangeCount = 1;
430 gpaHeader->RangeBufLen = sizeof(struct gpa_range) +
431 pageCount * sizeof(u64);
432 gpaHeader->Range[0].ByteOffset = 0;
433 gpaHeader->Range[0].ByteCount = Size;
434 for (i = 0; i < pageCount; i++)
435 gpaHeader->Range[0].PfnArray[i] = pfn+i;
437 *MsgInfo = msgHeader;
445 * VmbusChannelEstablishGpadl - Estabish a GPADL for the specified buffer
447 * @Channel: a channel
448 * @Kbuffer: from kmalloc
449 * @Size: page-size multiple
450 * @GpadlHandle: some funky thing
452 int VmbusChannelEstablishGpadl(struct vmbus_channel *Channel, void *Kbuffer,
453 u32 Size, u32 *GpadlHandle)
455 struct vmbus_channel_gpadl_header *gpadlMsg;
456 struct vmbus_channel_gpadl_body *gpadlBody;
457 /* struct vmbus_channel_gpadl_created *gpadlCreated; */
458 struct vmbus_channel_msginfo *msgInfo;
459 struct vmbus_channel_msginfo *subMsgInfo;
461 struct list_head *curr;
468 nextGpadlHandle = atomic_read(&gVmbusConnection.NextGpadlHandle);
469 atomic_inc(&gVmbusConnection.NextGpadlHandle);
471 VmbusChannelCreateGpadlHeader(Kbuffer, Size, &msgInfo, &msgCount);
472 ASSERT(msgInfo != NULL);
473 ASSERT(msgCount > 0);
475 msgInfo->WaitEvent = osd_WaitEventCreate();
476 gpadlMsg = (struct vmbus_channel_gpadl_header *)msgInfo->Msg;
477 gpadlMsg->Header.MessageType = ChannelMessageGpadlHeader;
478 gpadlMsg->ChildRelId = Channel->OfferMsg.ChildRelId;
479 gpadlMsg->Gpadl = nextGpadlHandle;
481 DumpGpadlHeader(gpadlMsg);
483 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
484 list_add_tail(&msgInfo->MsgListEntry,
485 &gVmbusConnection.ChannelMsgList);
487 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
488 DPRINT_DBG(VMBUS, "buffer %p, size %d msg cnt %d",
489 Kbuffer, Size, msgCount);
491 DPRINT_DBG(VMBUS, "Sending GPADL Header - len %zd",
492 msgInfo->MessageSize - sizeof(*msgInfo));
494 ret = VmbusPostMessage(gpadlMsg, msgInfo->MessageSize -
497 DPRINT_ERR(VMBUS, "Unable to open channel - %d", ret);
502 list_for_each(curr, &msgInfo->SubMsgList) {
504 /* FIXME: should this use list_entry() instead ? */
505 subMsgInfo = (struct vmbus_channel_msginfo *)curr;
507 (struct vmbus_channel_gpadl_body *)subMsgInfo->Msg;
509 gpadlBody->Header.MessageType = ChannelMessageGpadlBody;
510 gpadlBody->Gpadl = nextGpadlHandle;
512 DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd",
513 subMsgInfo->MessageSize -
514 sizeof(*subMsgInfo));
516 DumpGpadlBody(gpadlBody, subMsgInfo->MessageSize -
517 sizeof(*subMsgInfo));
518 ret = VmbusPostMessage(gpadlBody,
519 subMsgInfo->MessageSize -
520 sizeof(*subMsgInfo));
524 osd_WaitEventWait(msgInfo->WaitEvent);
526 /* At this point, we received the gpadl created msg */
527 DPRINT_DBG(VMBUS, "Received GPADL created "
528 "(relid %d, status %d handle %x)",
529 Channel->OfferMsg.ChildRelId,
530 msgInfo->Response.GpadlCreated.CreationStatus,
533 *GpadlHandle = gpadlMsg->Gpadl;
536 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
537 list_del(&msgInfo->MsgListEntry);
538 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
540 kfree(msgInfo->WaitEvent);
549 * VmbusChannelTeardownGpadl -Teardown the specified GPADL handle
551 int VmbusChannelTeardownGpadl(struct vmbus_channel *Channel, u32 GpadlHandle)
553 struct vmbus_channel_gpadl_teardown *msg;
554 struct vmbus_channel_msginfo *info;
560 ASSERT(GpadlHandle != 0);
562 info = kmalloc(sizeof(*info) +
563 sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
564 ASSERT(info != NULL);
566 info->WaitEvent = osd_WaitEventCreate();
568 msg = (struct vmbus_channel_gpadl_teardown *)info->Msg;
570 msg->Header.MessageType = ChannelMessageGpadlTeardown;
571 msg->ChildRelId = Channel->OfferMsg.ChildRelId;
572 msg->Gpadl = GpadlHandle;
574 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
575 list_add_tail(&info->MsgListEntry,
576 &gVmbusConnection.ChannelMsgList);
577 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
579 ret = VmbusPostMessage(msg,
580 sizeof(struct vmbus_channel_gpadl_teardown));
586 osd_WaitEventWait(info->WaitEvent);
588 /* Received a torndown response */
589 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
590 list_del(&info->MsgListEntry);
591 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
593 kfree(info->WaitEvent);
602 * VmbusChannelClose - Close the specified channel
604 void VmbusChannelClose(struct vmbus_channel *Channel)
606 struct vmbus_channel_close_channel *msg;
607 struct vmbus_channel_msginfo *info;
613 /* Stop callback and cancel the timer asap */
614 Channel->OnChannelCallback = NULL;
615 del_timer_sync(&Channel->poll_timer);
617 /* Send a closing message */
618 info = kmalloc(sizeof(*info) +
619 sizeof(struct vmbus_channel_close_channel), GFP_KERNEL);
620 ASSERT(info != NULL);
622 /* info->waitEvent = osd_WaitEventCreate(); */
624 msg = (struct vmbus_channel_close_channel *)info->Msg;
625 msg->Header.MessageType = ChannelMessageCloseChannel;
626 msg->ChildRelId = Channel->OfferMsg.ChildRelId;
628 ret = VmbusPostMessage(msg, sizeof(struct vmbus_channel_close_channel));
634 /* Tear down the gpadl for the channel's ring buffer */
635 if (Channel->RingBufferGpadlHandle)
636 VmbusChannelTeardownGpadl(Channel,
637 Channel->RingBufferGpadlHandle);
639 /* TODO: Send a msg to release the childRelId */
641 /* Cleanup the ring buffers for this channel */
642 RingBufferCleanup(&Channel->Outbound);
643 RingBufferCleanup(&Channel->Inbound);
645 osd_PageFree(Channel->RingBufferPages, Channel->RingBufferPageCount);
650 * If we are closing the channel during an error path in
651 * opening the channel, don't free the channel since the
652 * caller will free the channel
655 if (Channel->State == CHANNEL_OPEN_STATE) {
656 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
657 list_del(&Channel->ListEntry);
658 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
660 FreeVmbusChannel(Channel);
667 * VmbusChannelSendPacket - Send the specified buffer on the given channel
669 int VmbusChannelSendPacket(struct vmbus_channel *Channel, const void *Buffer,
670 u32 BufferLen, u64 RequestId,
671 enum vmbus_packet_type Type, u32 Flags)
673 struct vmpacket_descriptor desc;
674 u32 packetLen = sizeof(struct vmpacket_descriptor) + BufferLen;
675 u32 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
676 struct scatterlist bufferList[3];
681 DPRINT_DBG(VMBUS, "channel %p buffer %p len %d",
682 Channel, Buffer, BufferLen);
684 DumpVmbusChannel(Channel);
686 ASSERT((packetLenAligned - packetLen) < sizeof(u64));
688 /* Setup the descriptor */
689 desc.Type = Type; /* VmbusPacketTypeDataInBand; */
690 desc.Flags = Flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
691 /* in 8-bytes granularity */
692 desc.DataOffset8 = sizeof(struct vmpacket_descriptor) >> 3;
693 desc.Length8 = (u16)(packetLenAligned >> 3);
694 desc.TransactionId = RequestId;
696 sg_init_table(bufferList, 3);
697 sg_set_buf(&bufferList[0], &desc, sizeof(struct vmpacket_descriptor));
698 sg_set_buf(&bufferList[1], Buffer, BufferLen);
699 sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
701 ret = RingBufferWrite(&Channel->Outbound, bufferList, 3);
703 /* TODO: We should determine if this is optional */
704 if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
705 VmbusChannelSetEvent(Channel);
713 * VmbusChannelSendPacketPageBuffer - Send a range of single-page buffer packets using a GPADL Direct packet type.
715 int VmbusChannelSendPacketPageBuffer(struct vmbus_channel *Channel,
716 struct hv_page_buffer PageBuffers[],
717 u32 PageCount, void *Buffer, u32 BufferLen,
722 struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER desc;
725 u32 packetLenAligned;
726 struct scatterlist bufferList[3];
731 ASSERT(PageCount <= MAX_PAGE_BUFFER_COUNT);
733 DumpVmbusChannel(Channel);
736 * Adjust the size down since VMBUS_CHANNEL_PACKET_PAGE_BUFFER is the
737 * largest size we support
739 descSize = sizeof(struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER) -
740 ((MAX_PAGE_BUFFER_COUNT - PageCount) *
741 sizeof(struct hv_page_buffer));
742 packetLen = descSize + BufferLen;
743 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
745 ASSERT((packetLenAligned - packetLen) < sizeof(u64));
747 /* Setup the descriptor */
748 desc.Type = VmbusPacketTypeDataUsingGpaDirect;
749 desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
750 desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */
751 desc.Length8 = (u16)(packetLenAligned >> 3);
752 desc.TransactionId = RequestId;
753 desc.RangeCount = PageCount;
755 for (i = 0; i < PageCount; i++) {
756 desc.Range[i].Length = PageBuffers[i].Length;
757 desc.Range[i].Offset = PageBuffers[i].Offset;
758 desc.Range[i].Pfn = PageBuffers[i].Pfn;
761 sg_init_table(bufferList, 3);
762 sg_set_buf(&bufferList[0], &desc, descSize);
763 sg_set_buf(&bufferList[1], Buffer, BufferLen);
764 sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
766 ret = RingBufferWrite(&Channel->Outbound, bufferList, 3);
768 /* TODO: We should determine if this is optional */
769 if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
770 VmbusChannelSetEvent(Channel);
778 * VmbusChannelSendPacketMultiPageBuffer - Send a multi-page buffer packet using a GPADL Direct packet type.
780 int VmbusChannelSendPacketMultiPageBuffer(struct vmbus_channel *Channel,
781 struct hv_multipage_buffer *MultiPageBuffer,
782 void *Buffer, u32 BufferLen, u64 RequestId)
785 struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER desc;
788 u32 packetLenAligned;
789 struct scatterlist bufferList[3];
791 u32 PfnCount = NUM_PAGES_SPANNED(MultiPageBuffer->Offset,
792 MultiPageBuffer->Length);
796 DumpVmbusChannel(Channel);
798 DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u",
799 MultiPageBuffer->Offset, MultiPageBuffer->Length, PfnCount);
801 ASSERT(PfnCount > 0);
802 ASSERT(PfnCount <= MAX_MULTIPAGE_BUFFER_COUNT);
805 * Adjust the size down since VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER is
806 * the largest size we support
808 descSize = sizeof(struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER) -
809 ((MAX_MULTIPAGE_BUFFER_COUNT - PfnCount) *
811 packetLen = descSize + BufferLen;
812 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
814 ASSERT((packetLenAligned - packetLen) < sizeof(u64));
816 /* Setup the descriptor */
817 desc.Type = VmbusPacketTypeDataUsingGpaDirect;
818 desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
819 desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */
820 desc.Length8 = (u16)(packetLenAligned >> 3);
821 desc.TransactionId = RequestId;
824 desc.Range.Length = MultiPageBuffer->Length;
825 desc.Range.Offset = MultiPageBuffer->Offset;
827 memcpy(desc.Range.PfnArray, MultiPageBuffer->PfnArray,
828 PfnCount * sizeof(u64));
830 sg_init_table(bufferList, 3);
831 sg_set_buf(&bufferList[0], &desc, descSize);
832 sg_set_buf(&bufferList[1], Buffer, BufferLen);
833 sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
835 ret = RingBufferWrite(&Channel->Outbound, bufferList, 3);
837 /* TODO: We should determine if this is optional */
838 if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
839 VmbusChannelSetEvent(Channel);
847 * VmbusChannelRecvPacket - Retrieve the user packet on the specified channel
849 /* TODO: Do we ever receive a gpa direct packet other than the ones we send ? */
850 int VmbusChannelRecvPacket(struct vmbus_channel *Channel, void *Buffer,
851 u32 BufferLen, u32 *BufferActualLen, u64 *RequestId)
853 struct vmpacket_descriptor desc;
861 *BufferActualLen = 0;
864 spin_lock_irqsave(&Channel->inbound_lock, flags);
866 ret = RingBufferPeek(&Channel->Inbound, &desc,
867 sizeof(struct vmpacket_descriptor));
869 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
871 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
876 /* VmbusChannelClearEvent(Channel); */
878 packetLen = desc.Length8 << 3;
879 userLen = packetLen - (desc.DataOffset8 << 3);
880 /* ASSERT(userLen > 0); */
882 DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d "
883 "flag %d tid %llx pktlen %d datalen %d> ",
884 Channel, Channel->OfferMsg.ChildRelId, desc.Type,
885 desc.Flags, desc.TransactionId, packetLen, userLen);
887 *BufferActualLen = userLen;
889 if (userLen > BufferLen) {
890 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
892 DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d",
899 *RequestId = desc.TransactionId;
901 /* Copy over the packet to the user buffer */
902 ret = RingBufferRead(&Channel->Inbound, Buffer, userLen,
903 (desc.DataOffset8 << 3));
905 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
913 * VmbusChannelRecvPacketRaw - Retrieve the raw packet on the specified channel
915 int VmbusChannelRecvPacketRaw(struct vmbus_channel *Channel, void *Buffer,
916 u32 BufferLen, u32 *BufferActualLen,
919 struct vmpacket_descriptor desc;
927 *BufferActualLen = 0;
930 spin_lock_irqsave(&Channel->inbound_lock, flags);
932 ret = RingBufferPeek(&Channel->Inbound, &desc,
933 sizeof(struct vmpacket_descriptor));
935 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
937 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
942 /* VmbusChannelClearEvent(Channel); */
944 packetLen = desc.Length8 << 3;
945 userLen = packetLen - (desc.DataOffset8 << 3);
947 DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d "
948 "flag %d tid %llx pktlen %d datalen %d> ",
949 Channel, Channel->OfferMsg.ChildRelId, desc.Type,
950 desc.Flags, desc.TransactionId, packetLen, userLen);
952 *BufferActualLen = packetLen;
954 if (packetLen > BufferLen) {
955 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
957 DPRINT_ERR(VMBUS, "buffer too small - needed %d bytes but "
958 "got space for only %d bytes", packetLen, BufferLen);
963 *RequestId = desc.TransactionId;
965 /* Copy over the entire packet to the user buffer */
966 ret = RingBufferRead(&Channel->Inbound, Buffer, packetLen, 0);
968 spin_unlock_irqrestore(&Channel->inbound_lock, flags);
976 * VmbusChannelOnChannelEvent - Channel event callback
978 void VmbusChannelOnChannelEvent(struct vmbus_channel *Channel)
980 DumpVmbusChannel(Channel);
981 ASSERT(Channel->OnChannelCallback);
983 Channel->OnChannelCallback(Channel->ChannelCallbackContext);
985 mod_timer(&Channel->poll_timer, jiffies + usecs_to_jiffies(100));
989 * VmbusChannelOnTimer - Timer event callback
991 void VmbusChannelOnTimer(unsigned long data)
993 struct vmbus_channel *channel = (struct vmbus_channel *)data;
995 if (channel->OnChannelCallback)
996 channel->OnChannelCallback(channel->ChannelCallbackContext);
1000 * DumpVmbusChannel - Dump vmbus channel info to the console
1002 static void DumpVmbusChannel(struct vmbus_channel *Channel)
1004 DPRINT_DBG(VMBUS, "Channel (%d)", Channel->OfferMsg.ChildRelId);
1005 DumpRingInfo(&Channel->Outbound, "Outbound ");
1006 DumpRingInfo(&Channel->Inbound, "Inbound ");