/*
* 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 <linux/slab.h>
#include <linux/module.h>
#include "osd.h"
#include "logging.h"
#include "vmbus_private.h"
/* Internal routines */
static int create_gpadl_header(
void *kbuffer, /* must be phys and virt contiguous */
u32 size, /* page-size multiple */
struct vmbus_channel_msginfo **msginfo,
u32 *messagecount);
static void dump_vmbus_channel(struct vmbus_channel *channel);
static void vmbus_setevent(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
/*
* vmbus_setevent- Trigger an event notification on the specified
* channel.
*/
static void vmbus_setevent(struct vmbus_channel *channel)
{
struct hv_monitor_page *monitorpage;
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);
}
}
#if 0
static void VmbusChannelClearEvent(struct vmbus_channel *channel)
{
struct hv_monitor_page *monitorPage;
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);
}
}
#endif
/*
* vmbus_get_debug_info -Retrieve various channel debug info
*/
void vmbus_get_debug_info(struct vmbus_channel *channel,
struct vmbus_channel_debug_info *debuginfo)
{
struct hv_monitor_page *monitorpage;
u8 monitor_group = (u8)channel->OfferMsg.MonitorId / 32;
u8 monitor_offset = (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[monitor_group].Pending;
debuginfo->ServerMonitorLatency =
monitorpage->Latency[monitor_group][monitor_offset];
debuginfo->ServerMonitorConnectionId =
monitorpage->Parameter[monitor_group]
[monitor_offset].ConnectionId.u.Id;
monitorpage++;
debuginfo->ClientMonitorPending =
monitorpage->TriggerGroup[monitor_group].Pending;
debuginfo->ClientMonitorLatency =
monitorpage->Latency[monitor_group][monitor_offset];
debuginfo->ClientMonitorConnectionId =
monitorpage->Parameter[monitor_group]
[monitor_offset].ConnectionId.u.Id;
RingBufferGetDebugInfo(&channel->Inbound, &debuginfo->Inbound);
RingBufferGetDebugInfo(&channel->Outbound, &debuginfo->Outbound);
}
/*
* vmbus_open - Open the specified channel.
*/
int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
u32 recv_ringbuffer_size, void *userdata, u32 userdatalen,
void (*onchannelcallback)(void *context), void *context)
{
struct vmbus_channel_open_channel *openMsg;
struct vmbus_channel_msginfo *openInfo = NULL;
void *in, *out;
unsigned long flags;
int ret, err = 0;
/* 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((send_ringbuffer_size + recv_ringbuffer_size)
>> PAGE_SHIFT);
if (!out)
return -ENOMEM;
/* ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0); */
in = (void *)((unsigned long)out + send_ringbuffer_size);
newchannel->RingBufferPages = out;
newchannel->RingBufferPageCount = (send_ringbuffer_size +
recv_ringbuffer_size) >> PAGE_SHIFT;
ret = RingBufferInit(&newchannel->Outbound, out, send_ringbuffer_size);
if (ret != 0) {
err = ret;
goto errorout;
}
ret = RingBufferInit(&newchannel->Inbound, in, recv_ringbuffer_size);
if (ret != 0) {
err = ret;
goto errorout;
}
/* Establish the gpadl for the ring buffer */
DPRINT_DBG(VMBUS, "Establishing ring buffer's gpadl for channel %p...",
newchannel);
newchannel->RingBufferGpadlHandle = 0;
ret = vmbus_establish_gpadl(newchannel,
newchannel->Outbound.RingBuffer,
send_ringbuffer_size +
recv_ringbuffer_size,
&newchannel->RingBufferGpadlHandle);
if (ret != 0) {
err = ret;
goto errorout;
}
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,
send_ringbuffer_size);
/* Create and init the channel open message */
openInfo = kmalloc(sizeof(*openInfo) +
sizeof(struct vmbus_channel_open_channel),
GFP_KERNEL);
if (!openInfo) {
err = -ENOMEM;
goto errorout;
}
openInfo->WaitEvent = osd_WaitEventCreate();
if (!openInfo->WaitEvent) {
err = -ENOMEM;
goto errorout;
}
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;
openMsg->DownstreamRingBufferPageOffset = send_ringbuffer_size >>
PAGE_SHIFT;
openMsg->ServerContextAreaGpadlHandle = 0; /* TODO */
if (userdatalen > MAX_USER_DEFINED_BYTES) {
err = -EINVAL;
goto errorout;
}
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);
return 0;
errorout:
RingBufferCleanup(&newchannel->Outbound);
RingBufferCleanup(&newchannel->Inbound);
osd_PageFree(out, (send_ringbuffer_size + recv_ringbuffer_size)
>> PAGE_SHIFT);
kfree(openInfo);
return err;
}
EXPORT_SYMBOL_GPL(vmbus_open);
/*
* dump_gpadl_body - Dump the gpadl body message to the console for
* debugging purposes.
*/
static void dump_gpadl_body(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]);
}
/*
* dump_gpadl_header - Dump the gpadl header message to the console for
* debugging purposes.
*/
static void dump_gpadl_header(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]);
}
}
/*
* create_gpadl_header - Creates a gpadl for the specified buffer
*/
static int create_gpadl_header(void *kbuffer, u32 size,
struct vmbus_channel_msginfo **msginfo,
u32 *messagecount)
{
int i;
int pagecount;
unsigned long long pfn;
struct vmbus_channel_gpadl_header *gpadl_header;
struct vmbus_channel_gpadl_body *gpadl_body;
struct vmbus_channel_msginfo *msgheader;
struct vmbus_channel_msginfo *msgbody = NULL;
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);
if (!msgheader)
goto nomem;
INIT_LIST_HEAD(&msgheader->SubMsgList);
msgheader->MessageSize = msgsize;
gpadl_header = (struct vmbus_channel_gpadl_header *)
msgheader->Msg;
gpadl_header->RangeCount = 1;
gpadl_header->RangeBufLen = sizeof(struct gpa_range) +
pagecount * sizeof(u64);
gpadl_header->Range[0].ByteOffset = 0;
gpadl_header->Range[0].ByteCount = size;
for (i = 0; i < pfncount; i++)
gpadl_header->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);
/* FIXME: we probably need to more if this fails */
if (!msgbody)
goto nomem;
msgbody->MessageSize = msgsize;
(*messagecount)++;
gpadl_body =
(struct vmbus_channel_gpadl_body *)msgbody->Msg;
/*
* FIXME:
* Gpadl is u32 and we are using a pointer which could
* be 64-bit
*/
/* gpadl_body->Gpadl = kbuffer; */
for (i = 0; i < pfncurr; i++)
gpadl_body->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);
if (msgheader == NULL)
goto nomem;
msgheader->MessageSize = msgsize;
gpadl_header = (struct vmbus_channel_gpadl_header *)
msgheader->Msg;
gpadl_header->RangeCount = 1;
gpadl_header->RangeBufLen = sizeof(struct gpa_range) +
pagecount * sizeof(u64);
gpadl_header->Range[0].ByteOffset = 0;
gpadl_header->Range[0].ByteCount = size;
for (i = 0; i < pagecount; i++)
gpadl_header->Range[0].PfnArray[i] = pfn+i;
*msginfo = msgheader;
*messagecount = 1;
}
return 0;
nomem:
kfree(msgheader);
kfree(msgbody);
return -ENOMEM;
}
/*
* vmbus_establish_gpadl - Estabish a GPADL for the specified buffer
*
* @channel: a channel
* @kbuffer: from kmalloc
* @size: page-size multiple
* @gpadl_handle: some funky thing
*/
int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
u32 size, u32 *gpadl_handle)
{
struct vmbus_channel_gpadl_header *gpadlmsg;
struct vmbus_channel_gpadl_body *gpadl_body;
/* struct vmbus_channel_gpadl_created *gpadlCreated; */
struct vmbus_channel_msginfo *msginfo = NULL;
struct vmbus_channel_msginfo *submsginfo;
u32 msgcount;
struct list_head *curr;
u32 next_gpadl_handle;
unsigned long flags;
int ret = 0;
next_gpadl_handle = atomic_read(&gVmbusConnection.NextGpadlHandle);
atomic_inc(&gVmbusConnection.NextGpadlHandle);
ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount);
if (ret)
return ret;
msginfo->WaitEvent = osd_WaitEventCreate();
if (!msginfo->WaitEvent) {
ret = -ENOMEM;
goto Cleanup;
}
gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->Msg;
gpadlmsg->Header.MessageType = ChannelMessageGpadlHeader;
gpadlmsg->ChildRelId = channel->OfferMsg.ChildRelId;
gpadlmsg->Gpadl = next_gpadl_handle;
dump_gpadl_header(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;
gpadl_body =
(struct vmbus_channel_gpadl_body *)submsginfo->Msg;
gpadl_body->Header.MessageType =
ChannelMessageGpadlBody;
gpadl_body->Gpadl = next_gpadl_handle;
DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd",
submsginfo->MessageSize -
sizeof(*submsginfo));
dump_gpadl_body(gpadl_body, submsginfo->MessageSize -
sizeof(*submsginfo));
ret = VmbusPostMessage(gpadl_body,
submsginfo->MessageSize -
sizeof(*submsginfo));
if (ret != 0)
goto Cleanup;
}
}
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);
*gpadl_handle = 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);
return ret;
}
EXPORT_SYMBOL_GPL(vmbus_establish_gpadl);
/*
* vmbus_teardown_gpadl -Teardown the specified GPADL handle
*/
int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
{
struct vmbus_channel_gpadl_teardown *msg;
struct vmbus_channel_msginfo *info;
unsigned long flags;
int ret;
/* ASSERT(gpadl_handle != 0); */
info = kmalloc(sizeof(*info) +
sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->WaitEvent = osd_WaitEventCreate();
if (!info->WaitEvent) {
kfree(info);
return -ENOMEM;
}
msg = (struct vmbus_channel_gpadl_teardown *)info->Msg;
msg->Header.MessageType = ChannelMessageGpadlTeardown;
msg->ChildRelId = channel->OfferMsg.ChildRelId;
msg->Gpadl = gpadl_handle;
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);
return ret;
}
EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
/*
* vmbus_close - Close the specified channel
*/
void vmbus_close(struct vmbus_channel *channel)
{
struct vmbus_channel_close_channel *msg;
struct vmbus_channel_msginfo *info;
unsigned long flags;
int ret;
/* 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);
/* FIXME: can't do anything other than return here because the
* function is void */
if (!info)
return;
/* 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)
vmbus_teardown_gpadl(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);
free_channel(channel);
}
}
EXPORT_SYMBOL_GPL(vmbus_close);
/**
* vmbus_sendpacket() - Send the specified buffer on the given channel
* @channel: Pointer to vmbus_channel structure.
* @buffer: Pointer to the buffer you want to receive the data into.
* @bufferlen: Maximum size of what the the buffer will hold
* @requestid: Identifier of the request
* @type: Type of packet that is being send e.g. negotiate, time
* packet etc.
*
* Sends data in @buffer directly to hyper-v via the vmbus
* This will send the data unparsed to hyper-v.
*
* Mainly used by Hyper-V drivers.
*/
int vmbus_sendpacket(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 packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64));
struct scatterlist bufferlist[3];
u64 aligned_data = 0;
int ret;
DPRINT_DBG(VMBUS, "channel %p buffer %p len %d",
channel, buffer, bufferlen);
dump_vmbus_channel(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)(packetlen_aligned >> 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], &aligned_data,
packetlen_aligned - packetlen);
ret = RingBufferWrite(&channel->Outbound, bufferlist, 3);
/* TODO: We should determine if this is optional */
if (ret == 0 && !GetRingBufferInterruptMask(&channel->Outbound))
vmbus_setevent(channel);
return ret;
}
EXPORT_SYMBOL(vmbus_sendpacket);
/*
* vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
* packets using a GPADL Direct packet type.
*/
int vmbus_sendpacket_pagebuffer(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 packetlen_aligned;
struct scatterlist bufferlist[3];
u64 aligned_data = 0;
if (pagecount > MAX_PAGE_BUFFER_COUNT)
return -EINVAL;
dump_vmbus_channel(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;
packetlen_aligned = 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)(packetlen_aligned >> 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], &aligned_data,
packetlen_aligned - packetlen);
ret = RingBufferWrite(&channel->Outbound, bufferlist, 3);
/* TODO: We should determine if this is optional */
if (ret == 0 && !GetRingBufferInterruptMask(&channel->Outbound))
vmbus_setevent(channel);
return ret;
}
EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
/*
* vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
* using a GPADL Direct packet type.
*/
int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
struct hv_multipage_buffer *multi_pagebuffer,
void *buffer, u32 bufferlen, u64 requestid)
{
int ret;
struct vmbus_channel_packet_multipage_buffer desc;
u32 descsize;
u32 packetlen;
u32 packetlen_aligned;
struct scatterlist bufferlist[3];
u64 aligned_data = 0;
u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->Offset,
multi_pagebuffer->Length);
dump_vmbus_channel(channel);
DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u",
multi_pagebuffer->Offset,
multi_pagebuffer->Length, pfncount);
if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT))
return -EINVAL;
/*
* Adjust the size down since vmbus_channel_packet_multipage_buffer is
* the largest size we support
*/
descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) -
((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) *
sizeof(u64));
packetlen = descsize + bufferlen;
packetlen_aligned = 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)(packetlen_aligned >> 3);
desc.transactionid = requestid;
desc.rangecount = 1;
desc.range.Length = multi_pagebuffer->Length;
desc.range.Offset = multi_pagebuffer->Offset;
memcpy(desc.range.PfnArray, multi_pagebuffer->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], &aligned_data,
packetlen_aligned - packetlen);
ret = RingBufferWrite(&channel->Outbound, bufferlist, 3);
/* TODO: We should determine if this is optional */
if (ret == 0 && !GetRingBufferInterruptMask(&channel->Outbound))
vmbus_setevent(channel);
return ret;
}
EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer);
/**
* vmbus_recvpacket() - Retrieve the user packet on the specified channel
* @channel: Pointer to vmbus_channel structure.
* @buffer: Pointer to the buffer you want to receive the data into.
* @bufferlen: Maximum size of what the the buffer will hold
* @buffer_actual_len: The actual size of the data after it was received
* @requestid: Identifier of the request
*
* Receives directly from the hyper-v vmbus and puts the data it received
* into Buffer. This will receive the data unparsed from hyper-v.
*
* Mainly used by Hyper-V drivers.
*/
int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
u32 bufferlen, u32 *buffer_actual_len, u64 *requestid)
{
struct vmpacket_descriptor desc;
u32 packetlen;
u32 userlen;
int ret;
unsigned long flags;
*buffer_actual_len = 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!!"); */
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);
*buffer_actual_len = userlen;
if (userlen > bufferlen) {
spin_unlock_irqrestore(&channel->inbound_lock, flags);
DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d",
bufferlen, userlen);
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);
return 0;
}
EXPORT_SYMBOL(vmbus_recvpacket);
/*
* vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel
*/
int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
u32 bufferlen, u32 *buffer_actual_len,
u64 *requestid)
{
struct vmpacket_descriptor desc;
u32 packetlen;
u32 userlen;
int ret;
unsigned long flags;
*buffer_actual_len = 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!!"); */
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);
*buffer_actual_len = 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);
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);
return 0;
}
EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);
/*
* vmbus_onchannel_event - Channel event callback
*/
void vmbus_onchannel_event(struct vmbus_channel *channel)
{
dump_vmbus_channel(channel);
/* ASSERT(Channel->OnChannelCallback); */
channel->OnChannelCallback(channel->ChannelCallbackContext);
mod_timer(&channel->poll_timer, jiffies + usecs_to_jiffies(100));
}
/*
* vmbus_ontimer - Timer event callback
*/
void vmbus_ontimer(unsigned long data)
{
struct vmbus_channel *channel = (struct vmbus_channel *)data;
if (channel->OnChannelCallback)
channel->OnChannelCallback(channel->ChannelCallbackContext);
}
/*
* dump_vmbus_channel- Dump vmbus channel info to the console
*/
static void dump_vmbus_channel(struct vmbus_channel *channel)
{
DPRINT_DBG(VMBUS, "Channel (%d)", channel->OfferMsg.ChildRelId);
DumpRingInfo(&channel->Outbound, "Outbound ");
DumpRingInfo(&channel->Inbound, "Inbound ");
}
