Linux-2.6.33.2/drivers/staging/hv/Channel.c
/*
* Copyright (c) 2009, Microsoft Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Authors:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include "osd.h"
#include "logging.h"
#include "VmbusPrivate.h"
/* Internal routines */
static int VmbusChannelCreateGpadlHeader(
void *Kbuffer, /* must be phys and virt contiguous */
u32 Size, /* page-size multiple */
struct vmbus_channel_msginfo **msgInfo,
u32 *MessageCount);
static void DumpVmbusChannel(struct vmbus_channel *channel);
static void VmbusChannelSetEvent(struct vmbus_channel *channel);
#if 0
static void DumpMonitorPage(struct hv_monitor_page *MonitorPage)
{
int i = 0;
int j = 0;
DPRINT_DBG(VMBUS, "monitorPage - %p, trigger state - %d",
MonitorPage, MonitorPage->TriggerState);
for (i = 0; i < 4; i++)
DPRINT_DBG(VMBUS, "trigger group (%d) - %llx", i,
MonitorPage->TriggerGroup[i].AsUINT64);
for (i = 0; i < 4; i++) {
for (j = 0; j < 32; j++) {
DPRINT_DBG(VMBUS, "latency (%d)(%d) - %llx", i, j,
MonitorPage->Latency[i][j]);
}
}
for (i = 0; i < 4; i++) {
for (j = 0; j < 32; j++) {
DPRINT_DBG(VMBUS, "param-conn id (%d)(%d) - %d", i, j,
MonitorPage->Parameter[i][j].ConnectionId.Asu32);
DPRINT_DBG(VMBUS, "param-flag (%d)(%d) - %d", i, j,
MonitorPage->Parameter[i][j].FlagNumber);
}
}
}
#endif
/**
* VmbusChannelSetEvent - Trigger an event notification on the specified channel.
*/
static void VmbusChannelSetEvent(struct vmbus_channel *Channel)
{
struct hv_monitor_page *monitorPage;
DPRINT_ENTER(VMBUS);
if (Channel->OfferMsg.MonitorAllocated) {
/* Each u32 represents 32 channels */
set_bit(Channel->OfferMsg.ChildRelId & 31,
(unsigned long *) gVmbusConnection.SendInterruptPage +
(Channel->OfferMsg.ChildRelId >> 5));
monitorPage = gVmbusConnection.MonitorPages;
monitorPage++; /* Get the child to parent monitor page */
set_bit(Channel->MonitorBit,
(unsigned long *)&monitorPage->TriggerGroup
[Channel->MonitorGroup].Pending);
} else {
VmbusSetEvent(Channel->OfferMsg.ChildRelId);
}
DPRINT_EXIT(VMBUS);
}
#if 0
static void VmbusChannelClearEvent(struct vmbus_channel *channel)
{
struct hv_monitor_page *monitorPage;
DPRINT_ENTER(VMBUS);
if (Channel->OfferMsg.MonitorAllocated) {
/* Each u32 represents 32 channels */
clear_bit(Channel->OfferMsg.ChildRelId & 31,
(unsigned long *)gVmbusConnection.SendInterruptPage +
(Channel->OfferMsg.ChildRelId >> 5));
monitorPage =
(struct hv_monitor_page *)gVmbusConnection.MonitorPages;
monitorPage++; /* Get the child to parent monitor page */
clear_bit(Channel->MonitorBit,
(unsigned long *)&monitorPage->TriggerGroup
[Channel->MonitorGroup].Pending);
}
DPRINT_EXIT(VMBUS);
}
#endif
/**
* VmbusChannelGetDebugInfo -Retrieve various channel debug info
*/
void VmbusChannelGetDebugInfo(struct vmbus_channel *Channel,
struct vmbus_channel_debug_info *DebugInfo)
{
struct hv_monitor_page *monitorPage;
u8 monitorGroup = (u8)Channel->OfferMsg.MonitorId / 32;
u8 monitorOffset = (u8)Channel->OfferMsg.MonitorId % 32;
/* u32 monitorBit = 1 << monitorOffset; */
DebugInfo->RelId = Channel->OfferMsg.ChildRelId;
DebugInfo->State = Channel->State;
memcpy(&DebugInfo->InterfaceType,
&Channel->OfferMsg.Offer.InterfaceType, sizeof(struct hv_guid));
memcpy(&DebugInfo->InterfaceInstance,
&Channel->OfferMsg.Offer.InterfaceInstance,
sizeof(struct hv_guid));
monitorPage = (struct hv_monitor_page *)gVmbusConnection.MonitorPages;
DebugInfo->MonitorId = Channel->OfferMsg.MonitorId;
DebugInfo->ServerMonitorPending =
monitorPage->TriggerGroup[monitorGroup].Pending;
DebugInfo->ServerMonitorLatency =
monitorPage->Latency[monitorGroup][monitorOffset];
DebugInfo->ServerMonitorConnectionId =
monitorPage->Parameter[monitorGroup]
[monitorOffset].ConnectionId.u.Id;
monitorPage++;
DebugInfo->ClientMonitorPending =
monitorPage->TriggerGroup[monitorGroup].Pending;
DebugInfo->ClientMonitorLatency =
monitorPage->Latency[monitorGroup][monitorOffset];
DebugInfo->ClientMonitorConnectionId =
monitorPage->Parameter[monitorGroup]
[monitorOffset].ConnectionId.u.Id;
RingBufferGetDebugInfo(&Channel->Inbound, &DebugInfo->Inbound);
RingBufferGetDebugInfo(&Channel->Outbound, &DebugInfo->Outbound);
}
/**
* VmbusChannelOpen - Open the specified channel.
*/
int VmbusChannelOpen(struct vmbus_channel *NewChannel, u32 SendRingBufferSize,
u32 RecvRingBufferSize, void *UserData, u32 UserDataLen,
void (*OnChannelCallback)(void *context), void *Context)
{
struct vmbus_channel_open_channel *openMsg;
struct vmbus_channel_msginfo *openInfo;
void *in, *out;
unsigned long flags;
int ret;
DPRINT_ENTER(VMBUS);
/* Aligned to page size */
ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1)));
ASSERT(!(RecvRingBufferSize & (PAGE_SIZE - 1)));
NewChannel->OnChannelCallback = OnChannelCallback;
NewChannel->ChannelCallbackContext = Context;
/* Allocate the ring buffer */
out = osd_PageAlloc((SendRingBufferSize + RecvRingBufferSize)
>> PAGE_SHIFT);
ASSERT(out);
ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0);
in = (void *)((unsigned long)out + SendRingBufferSize);
NewChannel->RingBufferPages = out;
NewChannel->RingBufferPageCount = (SendRingBufferSize +
RecvRingBufferSize) >> PAGE_SHIFT;
RingBufferInit(&NewChannel->Outbound, out, SendRingBufferSize);
RingBufferInit(&NewChannel->Inbound, in, RecvRingBufferSize);
/* Establish the gpadl for the ring buffer */
DPRINT_DBG(VMBUS, "Establishing ring buffer's gpadl for channel %p...",
NewChannel);
NewChannel->RingBufferGpadlHandle = 0;
ret = VmbusChannelEstablishGpadl(NewChannel,
NewChannel->Outbound.RingBuffer,
SendRingBufferSize +
RecvRingBufferSize,
&NewChannel->RingBufferGpadlHandle);
DPRINT_DBG(VMBUS, "channel %p <relid %d gpadl 0x%x send ring %p "
"size %d recv ring %p size %d, downstreamoffset %d>",
NewChannel, NewChannel->OfferMsg.ChildRelId,
NewChannel->RingBufferGpadlHandle,
NewChannel->Outbound.RingBuffer,
NewChannel->Outbound.RingSize,
NewChannel->Inbound.RingBuffer,
NewChannel->Inbound.RingSize,
SendRingBufferSize);
/* Create and init the channel open message */
openInfo = kmalloc(sizeof(*openInfo) +
sizeof(struct vmbus_channel_open_channel),
GFP_KERNEL);
ASSERT(openInfo != NULL);
openInfo->WaitEvent = osd_WaitEventCreate();
openMsg = (struct vmbus_channel_open_channel *)openInfo->Msg;
openMsg->Header.MessageType = ChannelMessageOpenChannel;
openMsg->OpenId = NewChannel->OfferMsg.ChildRelId; /* FIXME */
openMsg->ChildRelId = NewChannel->OfferMsg.ChildRelId;
openMsg->RingBufferGpadlHandle = NewChannel->RingBufferGpadlHandle;
ASSERT(openMsg->RingBufferGpadlHandle);
openMsg->DownstreamRingBufferPageOffset = SendRingBufferSize >>
PAGE_SHIFT;
openMsg->ServerContextAreaGpadlHandle = 0; /* TODO */
ASSERT(UserDataLen <= MAX_USER_DEFINED_BYTES);
if (UserDataLen)
memcpy(openMsg->UserData, UserData, UserDataLen);
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
list_add_tail(&openInfo->MsgListEntry,
&gVmbusConnection.ChannelMsgList);
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
DPRINT_DBG(VMBUS, "Sending channel open msg...");
ret = VmbusPostMessage(openMsg,
sizeof(struct vmbus_channel_open_channel));
if (ret != 0) {
DPRINT_ERR(VMBUS, "unable to open channel - %d", ret);
goto Cleanup;
}
/* FIXME: Need to time-out here */
osd_WaitEventWait(openInfo->WaitEvent);
if (openInfo->Response.OpenResult.Status == 0)
DPRINT_INFO(VMBUS, "channel <%p> open success!!", NewChannel);
else
DPRINT_INFO(VMBUS, "channel <%p> open failed - %d!!",
NewChannel, openInfo->Response.OpenResult.Status);
Cleanup:
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
list_del(&openInfo->MsgListEntry);
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
kfree(openInfo->WaitEvent);
kfree(openInfo);
DPRINT_EXIT(VMBUS);
return 0;
}
/**
* DumpGpadlBody - Dump the gpadl body message to the console for debugging purposes.
*/
static void DumpGpadlBody(struct vmbus_channel_gpadl_body *Gpadl, u32 Len)
{
int i;
int pfnCount;
pfnCount = (Len - sizeof(struct vmbus_channel_gpadl_body)) /
sizeof(u64);
DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", Len, pfnCount);
for (i = 0; i < pfnCount; i++)
DPRINT_DBG(VMBUS, "gpadl body - %d) pfn %llu",
i, Gpadl->Pfn[i]);
}
/**
* DumpGpadlHeader - Dump the gpadl header message to the console for debugging purposes.
*/
static void DumpGpadlHeader(struct vmbus_channel_gpadl_header *Gpadl)
{
int i, j;
int pageCount;
DPRINT_DBG(VMBUS,
"gpadl header - relid %d, range count %d, range buflen %d",
Gpadl->ChildRelId, Gpadl->RangeCount, Gpadl->RangeBufLen);
for (i = 0; i < Gpadl->RangeCount; i++) {
pageCount = Gpadl->Range[i].ByteCount >> PAGE_SHIFT;
pageCount = (pageCount > 26) ? 26 : pageCount;
DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d "
"page count %d", i, Gpadl->Range[i].ByteCount,
Gpadl->Range[i].ByteOffset, pageCount);
for (j = 0; j < pageCount; j++)
DPRINT_DBG(VMBUS, "%d) pfn %llu", j,
Gpadl->Range[i].PfnArray[j]);
}
}
/**
* VmbusChannelCreateGpadlHeader - Creates a gpadl for the specified buffer
*/
static int VmbusChannelCreateGpadlHeader(void *Kbuffer, u32 Size,
struct vmbus_channel_msginfo **MsgInfo,
u32 *MessageCount)
{
int i;
int pageCount;
unsigned long long pfn;
struct vmbus_channel_gpadl_header *gpaHeader;
struct vmbus_channel_gpadl_body *gpadlBody;
struct vmbus_channel_msginfo *msgHeader;
struct vmbus_channel_msginfo *msgBody;
u32 msgSize;
int pfnSum, pfnCount, pfnLeft, pfnCurr, pfnSize;
/* ASSERT((kbuffer & (PAGE_SIZE-1)) == 0); */
ASSERT((Size & (PAGE_SIZE-1)) == 0);
pageCount = Size >> PAGE_SHIFT;
pfn = virt_to_phys(Kbuffer) >> PAGE_SHIFT;
/* do we need a gpadl body msg */
pfnSize = MAX_SIZE_CHANNEL_MESSAGE -
sizeof(struct vmbus_channel_gpadl_header) -
sizeof(struct gpa_range);
pfnCount = pfnSize / sizeof(u64);
if (pageCount > pfnCount) {
/* we need a gpadl body */
/* fill in the header */
msgSize = sizeof(struct vmbus_channel_msginfo) +
sizeof(struct vmbus_channel_gpadl_header) +
sizeof(struct gpa_range) + pfnCount * sizeof(u64);
msgHeader = kzalloc(msgSize, GFP_KERNEL);
INIT_LIST_HEAD(&msgHeader->SubMsgList);
msgHeader->MessageSize = msgSize;
gpaHeader = (struct vmbus_channel_gpadl_header *)msgHeader->Msg;
gpaHeader->RangeCount = 1;
gpaHeader->RangeBufLen = sizeof(struct gpa_range) +
pageCount * sizeof(u64);
gpaHeader->Range[0].ByteOffset = 0;
gpaHeader->Range[0].ByteCount = Size;
for (i = 0; i < pfnCount; i++)
gpaHeader->Range[0].PfnArray[i] = pfn+i;
*MsgInfo = msgHeader;
*MessageCount = 1;
pfnSum = pfnCount;
pfnLeft = pageCount - pfnCount;
/* how many pfns can we fit */
pfnSize = MAX_SIZE_CHANNEL_MESSAGE -
sizeof(struct vmbus_channel_gpadl_body);
pfnCount = pfnSize / sizeof(u64);
/* fill in the body */
while (pfnLeft) {
if (pfnLeft > pfnCount)
pfnCurr = pfnCount;
else
pfnCurr = pfnLeft;
msgSize = sizeof(struct vmbus_channel_msginfo) +
sizeof(struct vmbus_channel_gpadl_body) +
pfnCurr * sizeof(u64);
msgBody = kzalloc(msgSize, GFP_KERNEL);
ASSERT(msgBody);
msgBody->MessageSize = msgSize;
(*MessageCount)++;
gpadlBody =
(struct vmbus_channel_gpadl_body *)msgBody->Msg;
/*
* FIXME:
* Gpadl is u32 and we are using a pointer which could
* be 64-bit
*/
/* gpadlBody->Gpadl = kbuffer; */
for (i = 0; i < pfnCurr; i++)
gpadlBody->Pfn[i] = pfn + pfnSum + i;
/* add to msg header */
list_add_tail(&msgBody->MsgListEntry,
&msgHeader->SubMsgList);
pfnSum += pfnCurr;
pfnLeft -= pfnCurr;
}
} else {
/* everything fits in a header */
msgSize = sizeof(struct vmbus_channel_msginfo) +
sizeof(struct vmbus_channel_gpadl_header) +
sizeof(struct gpa_range) + pageCount * sizeof(u64);
msgHeader = kzalloc(msgSize, GFP_KERNEL);
msgHeader->MessageSize = msgSize;
gpaHeader = (struct vmbus_channel_gpadl_header *)msgHeader->Msg;
gpaHeader->RangeCount = 1;
gpaHeader->RangeBufLen = sizeof(struct gpa_range) +
pageCount * sizeof(u64);
gpaHeader->Range[0].ByteOffset = 0;
gpaHeader->Range[0].ByteCount = Size;
for (i = 0; i < pageCount; i++)
gpaHeader->Range[0].PfnArray[i] = pfn+i;
*MsgInfo = msgHeader;
*MessageCount = 1;
}
return 0;
}
/**
* VmbusChannelEstablishGpadl - Estabish a GPADL for the specified buffer
*
* @Channel: a channel
* @Kbuffer: from kmalloc
* @Size: page-size multiple
* @GpadlHandle: some funky thing
*/
int VmbusChannelEstablishGpadl(struct vmbus_channel *Channel, void *Kbuffer,
u32 Size, u32 *GpadlHandle)
{
struct vmbus_channel_gpadl_header *gpadlMsg;
struct vmbus_channel_gpadl_body *gpadlBody;
/* struct vmbus_channel_gpadl_created *gpadlCreated; */
struct vmbus_channel_msginfo *msgInfo;
struct vmbus_channel_msginfo *subMsgInfo;
u32 msgCount;
struct list_head *curr;
u32 nextGpadlHandle;
unsigned long flags;
int ret;
DPRINT_ENTER(VMBUS);
nextGpadlHandle = atomic_read(&gVmbusConnection.NextGpadlHandle);
atomic_inc(&gVmbusConnection.NextGpadlHandle);
VmbusChannelCreateGpadlHeader(Kbuffer, Size, &msgInfo, &msgCount);
ASSERT(msgInfo != NULL);
ASSERT(msgCount > 0);
msgInfo->WaitEvent = osd_WaitEventCreate();
gpadlMsg = (struct vmbus_channel_gpadl_header *)msgInfo->Msg;
gpadlMsg->Header.MessageType = ChannelMessageGpadlHeader;
gpadlMsg->ChildRelId = Channel->OfferMsg.ChildRelId;
gpadlMsg->Gpadl = nextGpadlHandle;
DumpGpadlHeader(gpadlMsg);
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
list_add_tail(&msgInfo->MsgListEntry,
&gVmbusConnection.ChannelMsgList);
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
DPRINT_DBG(VMBUS, "buffer %p, size %d msg cnt %d",
Kbuffer, Size, msgCount);
DPRINT_DBG(VMBUS, "Sending GPADL Header - len %zd",
msgInfo->MessageSize - sizeof(*msgInfo));
ret = VmbusPostMessage(gpadlMsg, msgInfo->MessageSize -
sizeof(*msgInfo));
if (ret != 0) {
DPRINT_ERR(VMBUS, "Unable to open channel - %d", ret);
goto Cleanup;
}
if (msgCount > 1) {
list_for_each(curr, &msgInfo->SubMsgList) {
/* FIXME: should this use list_entry() instead ? */
subMsgInfo = (struct vmbus_channel_msginfo *)curr;
gpadlBody =
(struct vmbus_channel_gpadl_body *)subMsgInfo->Msg;
gpadlBody->Header.MessageType = ChannelMessageGpadlBody;
gpadlBody->Gpadl = nextGpadlHandle;
DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd",
subMsgInfo->MessageSize -
sizeof(*subMsgInfo));
DumpGpadlBody(gpadlBody, subMsgInfo->MessageSize -
sizeof(*subMsgInfo));
ret = VmbusPostMessage(gpadlBody,
subMsgInfo->MessageSize -
sizeof(*subMsgInfo));
ASSERT(ret == 0);
}
}
osd_WaitEventWait(msgInfo->WaitEvent);
/* At this point, we received the gpadl created msg */
DPRINT_DBG(VMBUS, "Received GPADL created "
"(relid %d, status %d handle %x)",
Channel->OfferMsg.ChildRelId,
msgInfo->Response.GpadlCreated.CreationStatus,
gpadlMsg->Gpadl);
*GpadlHandle = gpadlMsg->Gpadl;
Cleanup:
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
list_del(&msgInfo->MsgListEntry);
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
kfree(msgInfo->WaitEvent);
kfree(msgInfo);
DPRINT_EXIT(VMBUS);
return ret;
}
/**
* VmbusChannelTeardownGpadl -Teardown the specified GPADL handle
*/
int VmbusChannelTeardownGpadl(struct vmbus_channel *Channel, u32 GpadlHandle)
{
struct vmbus_channel_gpadl_teardown *msg;
struct vmbus_channel_msginfo *info;
unsigned long flags;
int ret;
DPRINT_ENTER(VMBUS);
ASSERT(GpadlHandle != 0);
info = kmalloc(sizeof(*info) +
sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
ASSERT(info != NULL);
info->WaitEvent = osd_WaitEventCreate();
msg = (struct vmbus_channel_gpadl_teardown *)info->Msg;
msg->Header.MessageType = ChannelMessageGpadlTeardown;
msg->ChildRelId = Channel->OfferMsg.ChildRelId;
msg->Gpadl = GpadlHandle;
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
list_add_tail(&info->MsgListEntry,
&gVmbusConnection.ChannelMsgList);
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
ret = VmbusPostMessage(msg,
sizeof(struct vmbus_channel_gpadl_teardown));
if (ret != 0) {
/* TODO: */
/* something... */
}
osd_WaitEventWait(info->WaitEvent);
/* Received a torndown response */
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
list_del(&info->MsgListEntry);
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
kfree(info->WaitEvent);
kfree(info);
DPRINT_EXIT(VMBUS);
return ret;
}
/**
* VmbusChannelClose - Close the specified channel
*/
void VmbusChannelClose(struct vmbus_channel *Channel)
{
struct vmbus_channel_close_channel *msg;
struct vmbus_channel_msginfo *info;
unsigned long flags;
int ret;
DPRINT_ENTER(VMBUS);
/* Stop callback and cancel the timer asap */
Channel->OnChannelCallback = NULL;
del_timer_sync(&Channel->poll_timer);
/* Send a closing message */
info = kmalloc(sizeof(*info) +
sizeof(struct vmbus_channel_close_channel), GFP_KERNEL);
ASSERT(info != NULL);
/* info->waitEvent = osd_WaitEventCreate(); */
msg = (struct vmbus_channel_close_channel *)info->Msg;
msg->Header.MessageType = ChannelMessageCloseChannel;
msg->ChildRelId = Channel->OfferMsg.ChildRelId;
ret = VmbusPostMessage(msg, sizeof(struct vmbus_channel_close_channel));
if (ret != 0) {
/* TODO: */
/* something... */
}
/* Tear down the gpadl for the channel's ring buffer */
if (Channel->RingBufferGpadlHandle)
VmbusChannelTeardownGpadl(Channel,
Channel->RingBufferGpadlHandle);
/* TODO: Send a msg to release the childRelId */
/* Cleanup the ring buffers for this channel */
RingBufferCleanup(&Channel->Outbound);
RingBufferCleanup(&Channel->Inbound);
osd_PageFree(Channel->RingBufferPages, Channel->RingBufferPageCount);
kfree(info);
/*
* If we are closing the channel during an error path in
* opening the channel, don't free the channel since the
* caller will free the channel
*/
if (Channel->State == CHANNEL_OPEN_STATE) {
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
list_del(&Channel->ListEntry);
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
FreeVmbusChannel(Channel);
}
DPRINT_EXIT(VMBUS);
}
/**
* VmbusChannelSendPacket - Send the specified buffer on the given channel
*/
int VmbusChannelSendPacket(struct vmbus_channel *Channel, const void *Buffer,
u32 BufferLen, u64 RequestId,
enum vmbus_packet_type Type, u32 Flags)
{
struct vmpacket_descriptor desc;
u32 packetLen = sizeof(struct vmpacket_descriptor) + BufferLen;
u32 packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
struct scatterlist bufferList[3];
u64 alignedData = 0;
int ret;
DPRINT_ENTER(VMBUS);
DPRINT_DBG(VMBUS, "channel %p buffer %p len %d",
Channel, Buffer, BufferLen);
DumpVmbusChannel(Channel);
ASSERT((packetLenAligned - packetLen) < sizeof(u64));
/* Setup the descriptor */
desc.Type = Type; /* VmbusPacketTypeDataInBand; */
desc.Flags = Flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
/* in 8-bytes granularity */
desc.DataOffset8 = sizeof(struct vmpacket_descriptor) >> 3;
desc.Length8 = (u16)(packetLenAligned >> 3);
desc.TransactionId = RequestId;
sg_init_table(bufferList, 3);
sg_set_buf(&bufferList[0], &desc, sizeof(struct vmpacket_descriptor));
sg_set_buf(&bufferList[1], Buffer, BufferLen);
sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
ret = RingBufferWrite(&Channel->Outbound, bufferList, 3);
/* TODO: We should determine if this is optional */
if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
VmbusChannelSetEvent(Channel);
DPRINT_EXIT(VMBUS);
return ret;
}
/**
* VmbusChannelSendPacketPageBuffer - Send a range of single-page buffer packets using a GPADL Direct packet type.
*/
int VmbusChannelSendPacketPageBuffer(struct vmbus_channel *Channel,
struct hv_page_buffer PageBuffers[],
u32 PageCount, void *Buffer, u32 BufferLen,
u64 RequestId)
{
int ret;
int i;
struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER desc;
u32 descSize;
u32 packetLen;
u32 packetLenAligned;
struct scatterlist bufferList[3];
u64 alignedData = 0;
DPRINT_ENTER(VMBUS);
ASSERT(PageCount <= MAX_PAGE_BUFFER_COUNT);
DumpVmbusChannel(Channel);
/*
* Adjust the size down since VMBUS_CHANNEL_PACKET_PAGE_BUFFER is the
* largest size we support
*/
descSize = sizeof(struct VMBUS_CHANNEL_PACKET_PAGE_BUFFER) -
((MAX_PAGE_BUFFER_COUNT - PageCount) *
sizeof(struct hv_page_buffer));
packetLen = descSize + BufferLen;
packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
ASSERT((packetLenAligned - packetLen) < sizeof(u64));
/* Setup the descriptor */
desc.Type = VmbusPacketTypeDataUsingGpaDirect;
desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */
desc.Length8 = (u16)(packetLenAligned >> 3);
desc.TransactionId = RequestId;
desc.RangeCount = PageCount;
for (i = 0; i < PageCount; i++) {
desc.Range[i].Length = PageBuffers[i].Length;
desc.Range[i].Offset = PageBuffers[i].Offset;
desc.Range[i].Pfn = PageBuffers[i].Pfn;
}
sg_init_table(bufferList, 3);
sg_set_buf(&bufferList[0], &desc, descSize);
sg_set_buf(&bufferList[1], Buffer, BufferLen);
sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
ret = RingBufferWrite(&Channel->Outbound, bufferList, 3);
/* TODO: We should determine if this is optional */
if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
VmbusChannelSetEvent(Channel);
DPRINT_EXIT(VMBUS);
return ret;
}
/**
* VmbusChannelSendPacketMultiPageBuffer - Send a multi-page buffer packet using a GPADL Direct packet type.
*/
int VmbusChannelSendPacketMultiPageBuffer(struct vmbus_channel *Channel,
struct hv_multipage_buffer *MultiPageBuffer,
void *Buffer, u32 BufferLen, u64 RequestId)
{
int ret;
struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER desc;
u32 descSize;
u32 packetLen;
u32 packetLenAligned;
struct scatterlist bufferList[3];
u64 alignedData = 0;
u32 PfnCount = NUM_PAGES_SPANNED(MultiPageBuffer->Offset,
MultiPageBuffer->Length);
DPRINT_ENTER(VMBUS);
DumpVmbusChannel(Channel);
DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u",
MultiPageBuffer->Offset, MultiPageBuffer->Length, PfnCount);
ASSERT(PfnCount > 0);
ASSERT(PfnCount <= MAX_MULTIPAGE_BUFFER_COUNT);
/*
* Adjust the size down since VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER is
* the largest size we support
*/
descSize = sizeof(struct VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER) -
((MAX_MULTIPAGE_BUFFER_COUNT - PfnCount) *
sizeof(u64));
packetLen = descSize + BufferLen;
packetLenAligned = ALIGN_UP(packetLen, sizeof(u64));
ASSERT((packetLenAligned - packetLen) < sizeof(u64));
/* Setup the descriptor */
desc.Type = VmbusPacketTypeDataUsingGpaDirect;
desc.Flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
desc.DataOffset8 = descSize >> 3; /* in 8-bytes grandularity */
desc.Length8 = (u16)(packetLenAligned >> 3);
desc.TransactionId = RequestId;
desc.RangeCount = 1;
desc.Range.Length = MultiPageBuffer->Length;
desc.Range.Offset = MultiPageBuffer->Offset;
memcpy(desc.Range.PfnArray, MultiPageBuffer->PfnArray,
PfnCount * sizeof(u64));
sg_init_table(bufferList, 3);
sg_set_buf(&bufferList[0], &desc, descSize);
sg_set_buf(&bufferList[1], Buffer, BufferLen);
sg_set_buf(&bufferList[2], &alignedData, packetLenAligned - packetLen);
ret = RingBufferWrite(&Channel->Outbound, bufferList, 3);
/* TODO: We should determine if this is optional */
if (ret == 0 && !GetRingBufferInterruptMask(&Channel->Outbound))
VmbusChannelSetEvent(Channel);
DPRINT_EXIT(VMBUS);
return ret;
}
/**
* VmbusChannelRecvPacket - Retrieve the user packet on the specified channel
*/
/* TODO: Do we ever receive a gpa direct packet other than the ones we send ? */
int VmbusChannelRecvPacket(struct vmbus_channel *Channel, void *Buffer,
u32 BufferLen, u32 *BufferActualLen, u64 *RequestId)
{
struct vmpacket_descriptor desc;
u32 packetLen;
u32 userLen;
int ret;
unsigned long flags;
DPRINT_ENTER(VMBUS);
*BufferActualLen = 0;
*RequestId = 0;
spin_lock_irqsave(&Channel->inbound_lock, flags);
ret = RingBufferPeek(&Channel->Inbound, &desc,
sizeof(struct vmpacket_descriptor));
if (ret != 0) {
spin_unlock_irqrestore(&Channel->inbound_lock, flags);
/* DPRINT_DBG(VMBUS, "nothing to read!!"); */
DPRINT_EXIT(VMBUS);
return 0;
}
/* VmbusChannelClearEvent(Channel); */
packetLen = desc.Length8 << 3;
userLen = packetLen - (desc.DataOffset8 << 3);
/* ASSERT(userLen > 0); */
DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d "
"flag %d tid %llx pktlen %d datalen %d> ",
Channel, Channel->OfferMsg.ChildRelId, desc.Type,
desc.Flags, desc.TransactionId, packetLen, userLen);
*BufferActualLen = userLen;
if (userLen > BufferLen) {
spin_unlock_irqrestore(&Channel->inbound_lock, flags);
DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d",
BufferLen, userLen);
DPRINT_EXIT(VMBUS);
return -1;
}
*RequestId = desc.TransactionId;
/* Copy over the packet to the user buffer */
ret = RingBufferRead(&Channel->Inbound, Buffer, userLen,
(desc.DataOffset8 << 3));
spin_unlock_irqrestore(&Channel->inbound_lock, flags);
DPRINT_EXIT(VMBUS);
return 0;
}
/**
* VmbusChannelRecvPacketRaw - Retrieve the raw packet on the specified channel
*/
int VmbusChannelRecvPacketRaw(struct vmbus_channel *Channel, void *Buffer,
u32 BufferLen, u32 *BufferActualLen,
u64 *RequestId)
{
struct vmpacket_descriptor desc;
u32 packetLen;
u32 userLen;
int ret;
unsigned long flags;
DPRINT_ENTER(VMBUS);
*BufferActualLen = 0;
*RequestId = 0;
spin_lock_irqsave(&Channel->inbound_lock, flags);
ret = RingBufferPeek(&Channel->Inbound, &desc,
sizeof(struct vmpacket_descriptor));
if (ret != 0) {
spin_unlock_irqrestore(&Channel->inbound_lock, flags);
/* DPRINT_DBG(VMBUS, "nothing to read!!"); */
DPRINT_EXIT(VMBUS);
return 0;
}
/* VmbusChannelClearEvent(Channel); */
packetLen = desc.Length8 << 3;
userLen = packetLen - (desc.DataOffset8 << 3);
DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d "
"flag %d tid %llx pktlen %d datalen %d> ",
Channel, Channel->OfferMsg.ChildRelId, desc.Type,
desc.Flags, desc.TransactionId, packetLen, userLen);
*BufferActualLen = packetLen;
if (packetLen > BufferLen) {
spin_unlock_irqrestore(&Channel->inbound_lock, flags);
DPRINT_ERR(VMBUS, "buffer too small - needed %d bytes but "
"got space for only %d bytes", packetLen, BufferLen);
DPRINT_EXIT(VMBUS);
return -2;
}
*RequestId = desc.TransactionId;
/* Copy over the entire packet to the user buffer */
ret = RingBufferRead(&Channel->Inbound, Buffer, packetLen, 0);
spin_unlock_irqrestore(&Channel->inbound_lock, flags);
DPRINT_EXIT(VMBUS);
return 0;
}
/**
* VmbusChannelOnChannelEvent - Channel event callback
*/
void VmbusChannelOnChannelEvent(struct vmbus_channel *Channel)
{
DumpVmbusChannel(Channel);
ASSERT(Channel->OnChannelCallback);
Channel->OnChannelCallback(Channel->ChannelCallbackContext);
mod_timer(&Channel->poll_timer, jiffies + usecs_to_jiffies(100));
}
/**
* VmbusChannelOnTimer - Timer event callback
*/
void VmbusChannelOnTimer(unsigned long data)
{
struct vmbus_channel *channel = (struct vmbus_channel *)data;
if (channel->OnChannelCallback) {
channel->OnChannelCallback(channel->ChannelCallbackContext);
}
}
/**
* DumpVmbusChannel - Dump vmbus channel info to the console
*/
static void DumpVmbusChannel(struct vmbus_channel *Channel)
{
DPRINT_DBG(VMBUS, "Channel (%d)", Channel->OfferMsg.ChildRelId);
DumpRingInfo(&Channel->Outbound, "Outbound ");
DumpRingInfo(&Channel->Inbound, "Inbound ");
}