/*
* 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/list.h>
#include <linux/module.h>
#include <linux/completion.h>
#include "osd.h"
#include "logging.h"
#include "vmbus_private.h"
#include "utils.h"
struct vmbus_channel_message_table_entry {
enum vmbus_channel_message_type messageType;
void (*messageHandler)(struct vmbus_channel_message_header *msg);
};
#define MAX_MSG_TYPES 4
#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 8
static const struct hv_guid
gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
/* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
/* Storage - SCSI */
{
.data = {
0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
}
},
/* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
/* Network */
{
.data = {
0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
}
},
/* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
/* Input */
{
.data = {
0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
}
},
/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
/* IDE */
{
.data = {
0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
}
},
/* 0E0B6031-5213-4934-818B-38D90CED39DB */
/* Shutdown */
{
.data = {
0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
}
},
/* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
/* TimeSync */
{
.data = {
0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
}
},
/* {57164f39-9115-4e78-ab55-382f3bd5422d} */
/* Heartbeat */
{
.data = {
0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
}
},
/* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
/* KVP */
{
.data = {
0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
}
},
};
/**
* prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
* @icmsghdrp: Pointer to msg header structure
* @icmsg_negotiate: Pointer to negotiate message structure
* @buf: Raw buffer channel data
*
* @icmsghdrp is of type &struct icmsg_hdr.
* @negop is of type &struct icmsg_negotiate.
* Set up and fill in default negotiate response message. This response can
* come from both the vmbus driver and the hv_utils driver. The current api
* will respond properly to both Windows 2008 and Windows 2008-R2 operating
* systems.
*
* Mainly used by Hyper-V drivers.
*/
void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
struct icmsg_negotiate *negop,
u8 *buf)
{
if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
icmsghdrp->icmsgsize = 0x10;
negop = (struct icmsg_negotiate *)&buf[
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
if (negop->icframe_vercnt == 2 &&
negop->icversion_data[1].major == 3) {
negop->icversion_data[0].major = 3;
negop->icversion_data[0].minor = 0;
negop->icversion_data[1].major = 3;
negop->icversion_data[1].minor = 0;
} else {
negop->icversion_data[0].major = 1;
negop->icversion_data[0].minor = 0;
negop->icversion_data[1].major = 1;
negop->icversion_data[1].minor = 0;
}
negop->icframe_vercnt = 1;
negop->icmsg_vercnt = 1;
}
}
EXPORT_SYMBOL(prep_negotiate_resp);
/**
* chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
* Hyper-V requests
* @context: Pointer to argument structure.
*
* Set up the default handler for non device driver specific requests
* from Hyper-V. This stub responds to the default negotiate messages
* that come in for every non IDE/SCSI/Network request.
* This behavior is normally overwritten in the hv_utils driver. That
* driver handles requests like gracefull shutdown, heartbeats etc.
*
* Mainly used by Hyper-V drivers.
*/
void chn_cb_negotiate(void *context)
{
struct vmbus_channel *channel = context;
u8 *buf;
u32 buflen, recvlen;
u64 requestid;
struct icmsg_hdr *icmsghdrp;
struct icmsg_negotiate *negop = NULL;
buflen = PAGE_SIZE;
buf = kmalloc(buflen, GFP_ATOMIC);
vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
if (recvlen > 0) {
icmsghdrp = (struct icmsg_hdr *)&buf[
sizeof(struct vmbuspipe_hdr)];
prep_negotiate_resp(icmsghdrp, negop, buf);
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
| ICMSGHDRFLAG_RESPONSE;
vmbus_sendpacket(channel, buf,
recvlen, requestid,
VmbusPacketTypeDataInBand, 0);
}
kfree(buf);
}
EXPORT_SYMBOL(chn_cb_negotiate);
/*
* Function table used for message responses for non IDE/SCSI/Network type
* messages. (Such as KVP/Shutdown etc)
*/
struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
/* 0E0B6031-5213-4934-818B-38D90CED39DB */
/* Shutdown */
{
.msg_type = HV_SHUTDOWN_MSG,
.data = {
0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
},
.callback = chn_cb_negotiate,
.log_msg = "Shutdown channel functionality initialized"
},
/* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
/* TimeSync */
{
.msg_type = HV_TIMESYNC_MSG,
.data = {
0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
},
.callback = chn_cb_negotiate,
.log_msg = "Timesync channel functionality initialized"
},
/* {57164f39-9115-4e78-ab55-382f3bd5422d} */
/* Heartbeat */
{
.msg_type = HV_HEARTBEAT_MSG,
.data = {
0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
},
.callback = chn_cb_negotiate,
.log_msg = "Heartbeat channel functionality initialized"
},
/* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
/* KVP */
{
.data = {
0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
},
.callback = chn_cb_negotiate,
.log_msg = "KVP channel functionality initialized"
},
};
EXPORT_SYMBOL(hv_cb_utils);
/*
* alloc_channel - Allocate and initialize a vmbus channel object
*/
static struct vmbus_channel *alloc_channel(void)
{
struct vmbus_channel *channel;
channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
if (!channel)
return NULL;
spin_lock_init(&channel->inbound_lock);
init_timer(&channel->poll_timer);
channel->poll_timer.data = (unsigned long)channel;
channel->poll_timer.function = vmbus_ontimer;
channel->controlwq = create_workqueue("hv_vmbus_ctl");
if (!channel->controlwq) {
kfree(channel);
return NULL;
}
return channel;
}
/*
* release_hannel - Release the vmbus channel object itself
*/
static void release_channel(struct work_struct *work)
{
struct vmbus_channel *channel = container_of(work,
struct vmbus_channel,
work);
DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
destroy_workqueue(channel->controlwq);
DPRINT_DBG(VMBUS, "channel released (%p)", channel);
kfree(channel);
}
/*
* free_channel - Release the resources used by the vmbus channel object
*/
void free_channel(struct vmbus_channel *channel)
{
del_timer_sync(&channel->poll_timer);
/*
* We have to release the channel's workqueue/thread in the vmbus's
* workqueue/thread context
* ie we can't destroy ourselves.
*/
INIT_WORK(&channel->work, release_channel);
queue_work(vmbus_connection.WorkQueue, &channel->work);
}
DECLARE_COMPLETION(hv_channel_ready);
/*
* Count initialized channels, and ensure all channels are ready when hv_vmbus
* module loading completes.
*/
static void count_hv_channel(void)
{
static int counter;
unsigned long flags;
spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
if (++counter == MAX_MSG_TYPES)
complete(&hv_channel_ready);
spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
}
/*
* vmbus_process_rescind_offer -
* Rescind the offer by initiating a device removal
*/
static void vmbus_process_rescind_offer(struct work_struct *work)
{
struct vmbus_channel *channel = container_of(work,
struct vmbus_channel,
work);
vmbus_child_device_unregister(channel->device_obj);
}
/*
* vmbus_process_offer - Process the offer by creating a channel/device
* associated with this offer
*/
static void vmbus_process_offer(struct work_struct *work)
{
struct vmbus_channel *newchannel = container_of(work,
struct vmbus_channel,
work);
struct vmbus_channel *channel;
bool fnew = true;
int ret;
int cnt;
unsigned long flags;
/* The next possible work is rescind handling */
INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
/* Make sure this is a new offer */
spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
list_for_each_entry(channel, &vmbus_connection.ChannelList, listentry) {
if (!memcmp(&channel->offermsg.offer.InterfaceType,
&newchannel->offermsg.offer.InterfaceType,
sizeof(struct hv_guid)) &&
!memcmp(&channel->offermsg.offer.InterfaceInstance,
&newchannel->offermsg.offer.InterfaceInstance,
sizeof(struct hv_guid))) {
fnew = false;
break;
}
}
if (fnew)
list_add_tail(&newchannel->listentry,
&vmbus_connection.ChannelList);
spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
if (!fnew) {
DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
newchannel->offermsg.child_relid);
free_channel(newchannel);
return;
}
/*
* Start the process of binding this offer to the driver
* We need to set the DeviceObject field before calling
* VmbusChildDeviceAdd()
*/
newchannel->device_obj = vmbus_child_device_create(
&newchannel->offermsg.offer.InterfaceType,
&newchannel->offermsg.offer.InterfaceInstance,
newchannel);
DPRINT_DBG(VMBUS, "child device object allocated - %p",
newchannel->device_obj);
/*
* Add the new device to the bus. This will kick off device-driver
* binding which eventually invokes the device driver's AddDevice()
* method.
*/
ret = VmbusChildDeviceAdd(newchannel->device_obj);
if (ret != 0) {
DPRINT_ERR(VMBUS,
"unable to add child device object (relid %d)",
newchannel->offermsg.child_relid);
spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
list_del(&newchannel->listentry);
spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
free_channel(newchannel);
} else {
/*
* This state is used to indicate a successful open
* so that when we do close the channel normally, we
* can cleanup properly
*/
newchannel->state = CHANNEL_OPEN_STATE;
/* Open IC channels */
for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
if (memcmp(&newchannel->offermsg.offer.InterfaceType,
&hv_cb_utils[cnt].data,
sizeof(struct hv_guid)) == 0 &&
vmbus_open(newchannel, 2 * PAGE_SIZE,
2 * PAGE_SIZE, NULL, 0,
hv_cb_utils[cnt].callback,
newchannel) == 0) {
hv_cb_utils[cnt].channel = newchannel;
DPRINT_INFO(VMBUS, "%s",
hv_cb_utils[cnt].log_msg);
count_hv_channel();
}
}
}
}
/*
* vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
*
* We ignore all offers except network and storage offers. For each network and
* storage offers, we create a channel object and queue a work item to the
* channel object to process the offer synchronously
*/
static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
{
struct vmbus_channel_offer_channel *offer;
struct vmbus_channel *newchannel;
struct hv_guid *guidtype;
struct hv_guid *guidinstance;
int i;
int fsupported = 0;
offer = (struct vmbus_channel_offer_channel *)hdr;
for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
if (memcmp(&offer->offer.InterfaceType,
&gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
fsupported = 1;
break;
}
}
if (!fsupported) {
DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
"child relid %d", offer->child_relid);
return;
}
guidtype = &offer->offer.InterfaceType;
guidinstance = &offer->offer.InterfaceInstance;
DPRINT_INFO(VMBUS, "Channel offer notification - "
"child relid %d monitor id %d allocated %d, "
"type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
"%02x%02x%02x%02x%02x%02x%02x%02x} "
"instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
"%02x%02x%02x%02x%02x%02x%02x%02x}",
offer->child_relid, offer->monitorid,
offer->monitor_allocated,
guidtype->data[3], guidtype->data[2],
guidtype->data[1], guidtype->data[0],
guidtype->data[5], guidtype->data[4],
guidtype->data[7], guidtype->data[6],
guidtype->data[8], guidtype->data[9],
guidtype->data[10], guidtype->data[11],
guidtype->data[12], guidtype->data[13],
guidtype->data[14], guidtype->data[15],
guidinstance->data[3], guidinstance->data[2],
guidinstance->data[1], guidinstance->data[0],
guidinstance->data[5], guidinstance->data[4],
guidinstance->data[7], guidinstance->data[6],
guidinstance->data[8], guidinstance->data[9],
guidinstance->data[10], guidinstance->data[11],
guidinstance->data[12], guidinstance->data[13],
guidinstance->data[14], guidinstance->data[15]);
/* Allocate the channel object and save this offer. */
newchannel = alloc_channel();
if (!newchannel) {
DPRINT_ERR(VMBUS, "unable to allocate channel object");
return;
}
DPRINT_DBG(VMBUS, "channel object allocated - %p", newchannel);
memcpy(&newchannel->offermsg, offer,
sizeof(struct vmbus_channel_offer_channel));
newchannel->monitor_grp = (u8)offer->monitorid / 32;
newchannel->monitor_bit = (u8)offer->monitorid % 32;
/* TODO: Make sure the offer comes from our parent partition */
INIT_WORK(&newchannel->work, vmbus_process_offer);
queue_work(newchannel->controlwq, &newchannel->work);
}
/*
* vmbus_onoffer_rescind - Rescind offer handler.
*
* We queue a work item to process this offer synchronously
*/
static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
{
struct vmbus_channel_rescind_offer *rescind;
struct vmbus_channel *channel;
rescind = (struct vmbus_channel_rescind_offer *)hdr;
channel = GetChannelFromRelId(rescind->child_relid);
if (channel == NULL) {
DPRINT_DBG(VMBUS, "channel not found for relId %d",
rescind->child_relid);
return;
}
/* work is initialized for vmbus_process_rescind_offer() from
* vmbus_process_offer() where the channel got created */
queue_work(channel->controlwq, &channel->work);
}
/*
* vmbus_onoffers_delivered -
* This is invoked when all offers have been delivered.
*
* Nothing to do here.
*/
static void vmbus_onoffers_delivered(
struct vmbus_channel_message_header *hdr)
{
}
/*
* vmbus_onopen_result - Open result handler.
*
* This is invoked when we received a response to our channel open request.
* Find the matching request, copy the response and signal the requesting
* thread.
*/
static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
{
struct vmbus_channel_open_result *result;
struct list_head *curr;
struct vmbus_channel_msginfo *msginfo;
struct vmbus_channel_message_header *requestheader;
struct vmbus_channel_open_channel *openmsg;
unsigned long flags;
result = (struct vmbus_channel_open_result *)hdr;
DPRINT_DBG(VMBUS, "vmbus open result - %d", result->status);
/*
* Find the open msg, copy the result and signal/unblock the wait event
*/
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
list_for_each(curr, &vmbus_connection.ChannelMsgList) {
/* FIXME: this should probably use list_entry() instead */
msginfo = (struct vmbus_channel_msginfo *)curr;
requestheader =
(struct vmbus_channel_message_header *)msginfo->msg;
if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
openmsg =
(struct vmbus_channel_open_channel *)msginfo->msg;
if (openmsg->child_relid == result->child_relid &&
openmsg->openid == result->openid) {
memcpy(&msginfo->response.open_result,
result,
sizeof(struct vmbus_channel_open_result));
osd_waitevent_set(msginfo->waitevent);
break;
}
}
}
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
}
/*
* vmbus_ongpadl_created - GPADL created handler.
*
* This is invoked when we received a response to our gpadl create request.
* Find the matching request, copy the response and signal the requesting
* thread.
*/
static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
{
struct vmbus_channel_gpadl_created *gpadlcreated;
struct list_head *curr;
struct vmbus_channel_msginfo *msginfo;
struct vmbus_channel_message_header *requestheader;
struct vmbus_channel_gpadl_header *gpadlheader;
unsigned long flags;
gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
gpadlcreated->creation_status);
/*
* Find the establish msg, copy the result and signal/unblock the wait
* event
*/
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
list_for_each(curr, &vmbus_connection.ChannelMsgList) {
/* FIXME: this should probably use list_entry() instead */
msginfo = (struct vmbus_channel_msginfo *)curr;
requestheader =
(struct vmbus_channel_message_header *)msginfo->msg;
if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
gpadlheader =
(struct vmbus_channel_gpadl_header *)requestheader;
if ((gpadlcreated->child_relid ==
gpadlheader->child_relid) &&
(gpadlcreated->gpadl == gpadlheader->gpadl)) {
memcpy(&msginfo->response.gpadl_created,
gpadlcreated,
sizeof(struct vmbus_channel_gpadl_created));
osd_waitevent_set(msginfo->waitevent);
break;
}
}
}
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
}
/*
* vmbus_ongpadl_torndown - GPADL torndown handler.
*
* This is invoked when we received a response to our gpadl teardown request.
* Find the matching request, copy the response and signal the requesting
* thread.
*/
static void vmbus_ongpadl_torndown(
struct vmbus_channel_message_header *hdr)
{
struct vmbus_channel_gpadl_torndown *gpadl_torndown;
struct list_head *curr;
struct vmbus_channel_msginfo *msginfo;
struct vmbus_channel_message_header *requestheader;
struct vmbus_channel_gpadl_teardown *gpadl_teardown;
unsigned long flags;
gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
/*
* Find the open msg, copy the result and signal/unblock the wait event
*/
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
list_for_each(curr, &vmbus_connection.ChannelMsgList) {
/* FIXME: this should probably use list_entry() instead */
msginfo = (struct vmbus_channel_msginfo *)curr;
requestheader =
(struct vmbus_channel_message_header *)msginfo->msg;
if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
gpadl_teardown =
(struct vmbus_channel_gpadl_teardown *)requestheader;
if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
memcpy(&msginfo->response.gpadl_torndown,
gpadl_torndown,
sizeof(struct vmbus_channel_gpadl_torndown));
osd_waitevent_set(msginfo->waitevent);
break;
}
}
}
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
}
/*
* vmbus_onversion_response - Version response handler
*
* This is invoked when we received a response to our initiate contact request.
* Find the matching request, copy the response and signal the requesting
* thread.
*/
static void vmbus_onversion_response(
struct vmbus_channel_message_header *hdr)
{
struct list_head *curr;
struct vmbus_channel_msginfo *msginfo;
struct vmbus_channel_message_header *requestheader;
struct vmbus_channel_initiate_contact *initiate;
struct vmbus_channel_version_response *version_response;
unsigned long flags;
version_response = (struct vmbus_channel_version_response *)hdr;
spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
list_for_each(curr, &vmbus_connection.ChannelMsgList) {
/* FIXME: this should probably use list_entry() instead */
msginfo = (struct vmbus_channel_msginfo *)curr;
requestheader =
(struct vmbus_channel_message_header *)msginfo->msg;
if (requestheader->msgtype ==
CHANNELMSG_INITIATE_CONTACT) {
initiate =
(struct vmbus_channel_initiate_contact *)requestheader;
memcpy(&msginfo->response.version_response,
version_response,
sizeof(struct vmbus_channel_version_response));
osd_waitevent_set(msginfo->waitevent);
}
}
spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
}
/* Channel message dispatch table */
static struct vmbus_channel_message_table_entry
gChannelMessageTable[CHANNELMSG_COUNT] = {
{CHANNELMSG_INVALID, NULL},
{CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
{CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
{CHANNELMSG_REQUESTOFFERS, NULL},
{CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
{CHANNELMSG_OPENCHANNEL, NULL},
{CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
{CHANNELMSG_CLOSECHANNEL, NULL},
{CHANNELMSG_GPADL_HEADER, NULL},
{CHANNELMSG_GPADL_BODY, NULL},
{CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
{CHANNELMSG_GPADL_TEARDOWN, NULL},
{CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
{CHANNELMSG_RELID_RELEASED, NULL},
{CHANNELMSG_INITIATE_CONTACT, NULL},
{CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
{CHANNELMSG_UNLOAD, NULL},
};
/*
* vmbus_onmessage - Handler for channel protocol messages.
*
* This is invoked in the vmbus worker thread context.
*/
void vmbus_onmessage(void *context)
{
struct hv_message *msg = context;
struct vmbus_channel_message_header *hdr;
int size;
hdr = (struct vmbus_channel_message_header *)msg->u.payload;
size = msg->header.payload_size;
DPRINT_DBG(VMBUS, "message type %d size %d", hdr->msgtype, size);
if (hdr->msgtype >= CHANNELMSG_COUNT) {
DPRINT_ERR(VMBUS,
"Received invalid channel message type %d size %d",
hdr->msgtype, size);
print_hex_dump_bytes("", DUMP_PREFIX_NONE,
(unsigned char *)msg->u.payload, size);
return;
}
if (gChannelMessageTable[hdr->msgtype].messageHandler)
gChannelMessageTable[hdr->msgtype].messageHandler(hdr);
else
DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
hdr->msgtype);
}
/*
* vmbus_request_offers - Send a request to get all our pending offers.
*/
int vmbus_request_offers(void)
{
struct vmbus_channel_message_header *msg;
struct vmbus_channel_msginfo *msginfo;
int ret;
msginfo = kmalloc(sizeof(*msginfo) +
sizeof(struct vmbus_channel_message_header),
GFP_KERNEL);
if (!msginfo)
return -ENOMEM;
msginfo->waitevent = osd_waitevent_create();
if (!msginfo->waitevent) {
kfree(msginfo);
return -ENOMEM;
}
msg = (struct vmbus_channel_message_header *)msginfo->msg;
msg->msgtype = CHANNELMSG_REQUESTOFFERS;
/*SpinlockAcquire(gVmbusConnection.channelMsgLock);
INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
&msgInfo->msgListEntry);
SpinlockRelease(gVmbusConnection.channelMsgLock);*/
ret = VmbusPostMessage(msg,
sizeof(struct vmbus_channel_message_header));
if (ret != 0) {
DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
/*SpinlockAcquire(gVmbusConnection.channelMsgLock);
REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
SpinlockRelease(gVmbusConnection.channelMsgLock);*/
goto Cleanup;
}
/* osd_waitevent_wait(msgInfo->waitEvent); */
/*SpinlockAcquire(gVmbusConnection.channelMsgLock);
REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
SpinlockRelease(gVmbusConnection.channelMsgLock);*/
Cleanup:
if (msginfo) {
kfree(msginfo->waitevent);
kfree(msginfo);
}
return ret;
}
/*
* vmbus_release_unattached_channels - Release channels that are
* unattached/unconnected ie (no drivers associated)
*/
void vmbus_release_unattached_channels(void)
{
struct vmbus_channel *channel, *pos;
struct vmbus_channel *start = NULL;
unsigned long flags;
spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
list_for_each_entry_safe(channel, pos, &vmbus_connection.ChannelList,
listentry) {
if (channel == start)
break;
if (!channel->device_obj->Driver) {
list_del(&channel->listentry);
DPRINT_INFO(VMBUS,
"Releasing unattached device object %p",
channel->device_obj);
vmbus_child_device_unregister(channel->device_obj);
free_channel(channel);
} else {
if (!start)
start = channel;
}
}
spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
}
/* eof */
