![Haiyang Zhang](/assets/img/avatar_default.png)
There is a possible race condition when hv_utils starts to load immediately after hv_vmbus is loading - null pointer error could happen. This patch added wait/completion to ensure all channels are ready before vmbus loading completes. So another module won't have any uninitialized channel. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: Hank Janssen <hjanssen@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
895 lines
25 KiB
C
895 lines
25 KiB
C
/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/completion.h>
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#include "osd.h"
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#include "logging.h"
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#include "vmbus_private.h"
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#include "utils.h"
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struct vmbus_channel_message_table_entry {
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enum vmbus_channel_message_type messageType;
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void (*messageHandler)(struct vmbus_channel_message_header *msg);
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};
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#define MAX_MSG_TYPES 3
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#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 7
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static const struct hv_guid
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gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
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/* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
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/* Storage - SCSI */
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{
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.data = {
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0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
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0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
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}
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},
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/* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
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/* Network */
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{
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.data = {
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0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
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0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
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}
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},
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/* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
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/* Input */
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{
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.data = {
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0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
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0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
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}
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},
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/* {32412632-86cb-44a2-9b5c-50d1417354f5} */
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/* IDE */
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{
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.data = {
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0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
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0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
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}
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},
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/* 0E0B6031-5213-4934-818B-38D90CED39DB */
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/* Shutdown */
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{
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.data = {
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0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
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0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
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}
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},
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/* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
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/* TimeSync */
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{
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.data = {
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0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
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0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
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}
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},
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/* {57164f39-9115-4e78-ab55-382f3bd5422d} */
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/* Heartbeat */
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{
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.data = {
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0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
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0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
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}
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},
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};
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/**
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* prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
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* @icmsghdrp: Pointer to msg header structure
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* @icmsg_negotiate: Pointer to negotiate message structure
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* @buf: Raw buffer channel data
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*
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* @icmsghdrp is of type &struct icmsg_hdr.
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* @negop is of type &struct icmsg_negotiate.
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* Set up and fill in default negotiate response message. This response can
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* come from both the vmbus driver and the hv_utils driver. The current api
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* will respond properly to both Windows 2008 and Windows 2008-R2 operating
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* systems.
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*
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* Mainly used by Hyper-V drivers.
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*/
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void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
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struct icmsg_negotiate *negop,
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u8 *buf)
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{
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if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
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icmsghdrp->icmsgsize = 0x10;
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negop = (struct icmsg_negotiate *)&buf[
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sizeof(struct vmbuspipe_hdr) +
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sizeof(struct icmsg_hdr)];
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if (negop->icframe_vercnt == 2 &&
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negop->icversion_data[1].major == 3) {
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negop->icversion_data[0].major = 3;
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negop->icversion_data[0].minor = 0;
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negop->icversion_data[1].major = 3;
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negop->icversion_data[1].minor = 0;
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} else {
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negop->icversion_data[0].major = 1;
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negop->icversion_data[0].minor = 0;
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negop->icversion_data[1].major = 1;
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negop->icversion_data[1].minor = 0;
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}
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negop->icframe_vercnt = 1;
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negop->icmsg_vercnt = 1;
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}
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}
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EXPORT_SYMBOL(prep_negotiate_resp);
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/**
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* chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
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* Hyper-V requests
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* @context: Pointer to argument structure.
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*
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* Set up the default handler for non device driver specific requests
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* from Hyper-V. This stub responds to the default negotiate messages
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* that come in for every non IDE/SCSI/Network request.
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* This behavior is normally overwritten in the hv_utils driver. That
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* driver handles requests like gracefull shutdown, heartbeats etc.
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*
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* Mainly used by Hyper-V drivers.
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*/
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void chn_cb_negotiate(void *context)
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{
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struct vmbus_channel *channel = context;
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u8 *buf;
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u32 buflen, recvlen;
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u64 requestid;
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struct icmsg_hdr *icmsghdrp;
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struct icmsg_negotiate *negop = NULL;
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buflen = PAGE_SIZE;
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buf = kmalloc(buflen, GFP_ATOMIC);
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VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
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if (recvlen > 0) {
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icmsghdrp = (struct icmsg_hdr *)&buf[
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sizeof(struct vmbuspipe_hdr)];
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prep_negotiate_resp(icmsghdrp, negop, buf);
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icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
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| ICMSGHDRFLAG_RESPONSE;
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VmbusChannelSendPacket(channel, buf,
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recvlen, requestid,
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VmbusPacketTypeDataInBand, 0);
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}
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kfree(buf);
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}
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EXPORT_SYMBOL(chn_cb_negotiate);
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/*
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* Function table used for message responses for non IDE/SCSI/Network type
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* messages. (Such as KVP/Shutdown etc)
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*/
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struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
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/* 0E0B6031-5213-4934-818B-38D90CED39DB */
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/* Shutdown */
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{
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.msg_type = HV_SHUTDOWN_MSG,
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.data = {
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0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
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0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
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},
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.callback = chn_cb_negotiate,
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.log_msg = "Shutdown channel functionality initialized"
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},
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/* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
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/* TimeSync */
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{
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.msg_type = HV_TIMESYNC_MSG,
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.data = {
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0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
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0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
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},
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.callback = chn_cb_negotiate,
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.log_msg = "Timesync channel functionality initialized"
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},
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/* {57164f39-9115-4e78-ab55-382f3bd5422d} */
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/* Heartbeat */
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{
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.msg_type = HV_HEARTBEAT_MSG,
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.data = {
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0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
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0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
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},
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.callback = chn_cb_negotiate,
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.log_msg = "Heartbeat channel functionality initialized"
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},
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};
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EXPORT_SYMBOL(hv_cb_utils);
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/*
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* AllocVmbusChannel - Allocate and initialize a vmbus channel object
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*/
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struct vmbus_channel *AllocVmbusChannel(void)
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{
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struct vmbus_channel *channel;
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channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
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if (!channel)
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return NULL;
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spin_lock_init(&channel->inbound_lock);
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init_timer(&channel->poll_timer);
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channel->poll_timer.data = (unsigned long)channel;
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channel->poll_timer.function = VmbusChannelOnTimer;
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channel->ControlWQ = create_workqueue("hv_vmbus_ctl");
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if (!channel->ControlWQ) {
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kfree(channel);
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return NULL;
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}
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return channel;
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}
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/*
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* ReleaseVmbusChannel - Release the vmbus channel object itself
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*/
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static inline void ReleaseVmbusChannel(void *context)
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{
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struct vmbus_channel *channel = context;
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DPRINT_ENTER(VMBUS);
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DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
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destroy_workqueue(channel->ControlWQ);
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DPRINT_DBG(VMBUS, "channel released (%p)", channel);
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kfree(channel);
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DPRINT_EXIT(VMBUS);
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}
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/*
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* FreeVmbusChannel - Release the resources used by the vmbus channel object
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*/
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void FreeVmbusChannel(struct vmbus_channel *Channel)
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{
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del_timer_sync(&Channel->poll_timer);
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/*
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* We have to release the channel's workqueue/thread in the vmbus's
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* workqueue/thread context
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* ie we can't destroy ourselves.
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*/
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osd_schedule_callback(gVmbusConnection.WorkQueue, ReleaseVmbusChannel,
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Channel);
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}
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DECLARE_COMPLETION(hv_channel_ready);
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/*
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* Count initialized channels, and ensure all channels are ready when hv_vmbus
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* module loading completes.
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*/
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static void count_hv_channel(void)
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{
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static int counter;
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unsigned long flags;
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spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
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if (++counter == MAX_MSG_TYPES)
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complete(&hv_channel_ready);
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spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
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}
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/*
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* VmbusChannelProcessOffer - Process the offer by creating a channel/device
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* associated with this offer
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*/
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static void VmbusChannelProcessOffer(void *context)
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{
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struct vmbus_channel *newChannel = context;
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struct vmbus_channel *channel;
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bool fNew = true;
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int ret;
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int cnt;
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unsigned long flags;
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DPRINT_ENTER(VMBUS);
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/* Make sure this is a new offer */
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spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
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list_for_each_entry(channel, &gVmbusConnection.ChannelList, ListEntry) {
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if (!memcmp(&channel->OfferMsg.Offer.InterfaceType,
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&newChannel->OfferMsg.Offer.InterfaceType,
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sizeof(struct hv_guid)) &&
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!memcmp(&channel->OfferMsg.Offer.InterfaceInstance,
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&newChannel->OfferMsg.Offer.InterfaceInstance,
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sizeof(struct hv_guid))) {
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fNew = false;
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break;
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}
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}
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if (fNew)
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list_add_tail(&newChannel->ListEntry,
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&gVmbusConnection.ChannelList);
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spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
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if (!fNew) {
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DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
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newChannel->OfferMsg.ChildRelId);
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FreeVmbusChannel(newChannel);
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DPRINT_EXIT(VMBUS);
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return;
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}
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/*
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* Start the process of binding this offer to the driver
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* We need to set the DeviceObject field before calling
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* VmbusChildDeviceAdd()
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*/
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newChannel->DeviceObject = VmbusChildDeviceCreate(
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&newChannel->OfferMsg.Offer.InterfaceType,
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&newChannel->OfferMsg.Offer.InterfaceInstance,
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newChannel);
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DPRINT_DBG(VMBUS, "child device object allocated - %p",
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newChannel->DeviceObject);
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/*
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* Add the new device to the bus. This will kick off device-driver
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* binding which eventually invokes the device driver's AddDevice()
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* method.
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*/
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ret = VmbusChildDeviceAdd(newChannel->DeviceObject);
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if (ret != 0) {
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DPRINT_ERR(VMBUS,
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"unable to add child device object (relid %d)",
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newChannel->OfferMsg.ChildRelId);
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spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
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list_del(&newChannel->ListEntry);
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spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
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FreeVmbusChannel(newChannel);
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} else {
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/*
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* This state is used to indicate a successful open
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* so that when we do close the channel normally, we
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* can cleanup properly
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*/
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newChannel->State = CHANNEL_OPEN_STATE;
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/* Open IC channels */
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for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
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if (memcmp(&newChannel->OfferMsg.Offer.InterfaceType,
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&hv_cb_utils[cnt].data,
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sizeof(struct hv_guid)) == 0 &&
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VmbusChannelOpen(newChannel, 2 * PAGE_SIZE,
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2 * PAGE_SIZE, NULL, 0,
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hv_cb_utils[cnt].callback,
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newChannel) == 0) {
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hv_cb_utils[cnt].channel = newChannel;
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DPRINT_INFO(VMBUS, "%s",
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hv_cb_utils[cnt].log_msg);
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count_hv_channel();
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}
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}
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}
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DPRINT_EXIT(VMBUS);
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}
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/*
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* VmbusChannelProcessRescindOffer - Rescind the offer by initiating a device removal
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*/
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static void VmbusChannelProcessRescindOffer(void *context)
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{
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struct vmbus_channel *channel = context;
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|
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DPRINT_ENTER(VMBUS);
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VmbusChildDeviceRemove(channel->DeviceObject);
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DPRINT_EXIT(VMBUS);
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}
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|
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/*
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* VmbusChannelOnOffer - Handler for channel offers from vmbus in parent partition.
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*
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* We ignore all offers except network and storage offers. For each network and
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* storage offers, we create a channel object and queue a work item to the
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* channel object to process the offer synchronously
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*/
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static void VmbusChannelOnOffer(struct vmbus_channel_message_header *hdr)
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{
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struct vmbus_channel_offer_channel *offer;
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struct vmbus_channel *newChannel;
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struct hv_guid *guidType;
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struct hv_guid *guidInstance;
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int i;
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int fSupported = 0;
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|
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DPRINT_ENTER(VMBUS);
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offer = (struct vmbus_channel_offer_channel *)hdr;
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for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
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if (memcmp(&offer->Offer.InterfaceType,
|
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&gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
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fSupported = 1;
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break;
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}
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}
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|
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if (!fSupported) {
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DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
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"child relid %d", offer->ChildRelId);
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DPRINT_EXIT(VMBUS);
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return;
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}
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guidType = &offer->Offer.InterfaceType;
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guidInstance = &offer->Offer.InterfaceInstance;
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|
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DPRINT_INFO(VMBUS, "Channel offer notification - "
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"child relid %d monitor id %d allocated %d, "
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"type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
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"%02x%02x%02x%02x%02x%02x%02x%02x} "
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"instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
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"%02x%02x%02x%02x%02x%02x%02x%02x}",
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offer->ChildRelId, offer->MonitorId,
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offer->MonitorAllocated,
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guidType->data[3], guidType->data[2],
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guidType->data[1], guidType->data[0],
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guidType->data[5], guidType->data[4],
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guidType->data[7], guidType->data[6],
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guidType->data[8], guidType->data[9],
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guidType->data[10], guidType->data[11],
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|
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 = AllocVmbusChannel();
|
|
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->MonitorGroup = (u8)offer->MonitorId / 32;
|
|
newChannel->MonitorBit = (u8)offer->MonitorId % 32;
|
|
|
|
/* TODO: Make sure the offer comes from our parent partition */
|
|
osd_schedule_callback(newChannel->ControlWQ, VmbusChannelProcessOffer,
|
|
newChannel);
|
|
|
|
DPRINT_EXIT(VMBUS);
|
|
}
|
|
|
|
/*
|
|
* VmbusChannelOnOfferRescind - Rescind offer handler.
|
|
*
|
|
* We queue a work item to process this offer synchronously
|
|
*/
|
|
static void VmbusChannelOnOfferRescind(struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_rescind_offer *rescind;
|
|
struct vmbus_channel *channel;
|
|
|
|
DPRINT_ENTER(VMBUS);
|
|
|
|
rescind = (struct vmbus_channel_rescind_offer *)hdr;
|
|
channel = GetChannelFromRelId(rescind->ChildRelId);
|
|
if (channel == NULL) {
|
|
DPRINT_DBG(VMBUS, "channel not found for relId %d",
|
|
rescind->ChildRelId);
|
|
return;
|
|
}
|
|
|
|
osd_schedule_callback(channel->ControlWQ,
|
|
VmbusChannelProcessRescindOffer,
|
|
channel);
|
|
|
|
DPRINT_EXIT(VMBUS);
|
|
}
|
|
|
|
/*
|
|
* VmbusChannelOnOffersDelivered - This is invoked when all offers have been delivered.
|
|
*
|
|
* Nothing to do here.
|
|
*/
|
|
static void VmbusChannelOnOffersDelivered(
|
|
struct vmbus_channel_message_header *hdr)
|
|
{
|
|
DPRINT_ENTER(VMBUS);
|
|
DPRINT_EXIT(VMBUS);
|
|
}
|
|
|
|
/*
|
|
* VmbusChannelOnOpenResult - 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 VmbusChannelOnOpenResult(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;
|
|
|
|
DPRINT_ENTER(VMBUS);
|
|
|
|
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(&gVmbusConnection.channelmsg_lock, flags);
|
|
|
|
list_for_each(curr, &gVmbusConnection.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->MessageType == ChannelMessageOpenChannel) {
|
|
openMsg = (struct vmbus_channel_open_channel *)msgInfo->Msg;
|
|
if (openMsg->ChildRelId == result->ChildRelId &&
|
|
openMsg->OpenId == result->OpenId) {
|
|
memcpy(&msgInfo->Response.OpenResult,
|
|
result,
|
|
sizeof(struct vmbus_channel_open_result));
|
|
osd_WaitEventSet(msgInfo->WaitEvent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
|
|
|
|
DPRINT_EXIT(VMBUS);
|
|
}
|
|
|
|
/*
|
|
* VmbusChannelOnGpadlCreated - 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 VmbusChannelOnGpadlCreated(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;
|
|
|
|
DPRINT_ENTER(VMBUS);
|
|
|
|
gpadlCreated = (struct vmbus_channel_gpadl_created *)hdr;
|
|
DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
|
|
gpadlCreated->CreationStatus);
|
|
|
|
/*
|
|
* Find the establish msg, copy the result and signal/unblock the wait
|
|
* event
|
|
*/
|
|
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
|
|
|
|
list_for_each(curr, &gVmbusConnection.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->MessageType == ChannelMessageGpadlHeader) {
|
|
gpadlHeader = (struct vmbus_channel_gpadl_header *)requestHeader;
|
|
|
|
if ((gpadlCreated->ChildRelId ==
|
|
gpadlHeader->ChildRelId) &&
|
|
(gpadlCreated->Gpadl == gpadlHeader->Gpadl)) {
|
|
memcpy(&msgInfo->Response.GpadlCreated,
|
|
gpadlCreated,
|
|
sizeof(struct vmbus_channel_gpadl_created));
|
|
osd_WaitEventSet(msgInfo->WaitEvent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
|
|
|
|
DPRINT_EXIT(VMBUS);
|
|
}
|
|
|
|
/*
|
|
* VmbusChannelOnGpadlTorndown - 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 VmbusChannelOnGpadlTorndown(
|
|
struct vmbus_channel_message_header *hdr)
|
|
{
|
|
struct vmbus_channel_gpadl_torndown *gpadlTorndown;
|
|
struct list_head *curr;
|
|
struct vmbus_channel_msginfo *msgInfo;
|
|
struct vmbus_channel_message_header *requestHeader;
|
|
struct vmbus_channel_gpadl_teardown *gpadlTeardown;
|
|
unsigned long flags;
|
|
|
|
DPRINT_ENTER(VMBUS);
|
|
|
|
gpadlTorndown = (struct vmbus_channel_gpadl_torndown *)hdr;
|
|
|
|
/*
|
|
* Find the open msg, copy the result and signal/unblock the wait event
|
|
*/
|
|
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
|
|
|
|
list_for_each(curr, &gVmbusConnection.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->MessageType == ChannelMessageGpadlTeardown) {
|
|
gpadlTeardown = (struct vmbus_channel_gpadl_teardown *)requestHeader;
|
|
|
|
if (gpadlTorndown->Gpadl == gpadlTeardown->Gpadl) {
|
|
memcpy(&msgInfo->Response.GpadlTorndown,
|
|
gpadlTorndown,
|
|
sizeof(struct vmbus_channel_gpadl_torndown));
|
|
osd_WaitEventSet(msgInfo->WaitEvent);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
|
|
|
|
DPRINT_EXIT(VMBUS);
|
|
}
|
|
|
|
/*
|
|
* VmbusChannelOnVersionResponse - 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 VmbusChannelOnVersionResponse(
|
|
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 *versionResponse;
|
|
unsigned long flags;
|
|
|
|
DPRINT_ENTER(VMBUS);
|
|
|
|
versionResponse = (struct vmbus_channel_version_response *)hdr;
|
|
spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
|
|
|
|
list_for_each(curr, &gVmbusConnection.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->MessageType ==
|
|
ChannelMessageInitiateContact) {
|
|
initiate = (struct vmbus_channel_initiate_contact *)requestHeader;
|
|
memcpy(&msgInfo->Response.VersionResponse,
|
|
versionResponse,
|
|
sizeof(struct vmbus_channel_version_response));
|
|
osd_WaitEventSet(msgInfo->WaitEvent);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
|
|
|
|
DPRINT_EXIT(VMBUS);
|
|
}
|
|
|
|
/* Channel message dispatch table */
|
|
static struct vmbus_channel_message_table_entry
|
|
gChannelMessageTable[ChannelMessageCount] = {
|
|
{ChannelMessageInvalid, NULL},
|
|
{ChannelMessageOfferChannel, VmbusChannelOnOffer},
|
|
{ChannelMessageRescindChannelOffer, VmbusChannelOnOfferRescind},
|
|
{ChannelMessageRequestOffers, NULL},
|
|
{ChannelMessageAllOffersDelivered, VmbusChannelOnOffersDelivered},
|
|
{ChannelMessageOpenChannel, NULL},
|
|
{ChannelMessageOpenChannelResult, VmbusChannelOnOpenResult},
|
|
{ChannelMessageCloseChannel, NULL},
|
|
{ChannelMessageGpadlHeader, NULL},
|
|
{ChannelMessageGpadlBody, NULL},
|
|
{ChannelMessageGpadlCreated, VmbusChannelOnGpadlCreated},
|
|
{ChannelMessageGpadlTeardown, NULL},
|
|
{ChannelMessageGpadlTorndown, VmbusChannelOnGpadlTorndown},
|
|
{ChannelMessageRelIdReleased, NULL},
|
|
{ChannelMessageInitiateContact, NULL},
|
|
{ChannelMessageVersionResponse, VmbusChannelOnVersionResponse},
|
|
{ChannelMessageUnload, NULL},
|
|
};
|
|
|
|
/*
|
|
* VmbusOnChannelMessage - Handler for channel protocol messages.
|
|
*
|
|
* This is invoked in the vmbus worker thread context.
|
|
*/
|
|
void VmbusOnChannelMessage(void *Context)
|
|
{
|
|
struct hv_message *msg = Context;
|
|
struct vmbus_channel_message_header *hdr;
|
|
int size;
|
|
|
|
DPRINT_ENTER(VMBUS);
|
|
|
|
hdr = (struct vmbus_channel_message_header *)msg->u.Payload;
|
|
size = msg->Header.PayloadSize;
|
|
|
|
DPRINT_DBG(VMBUS, "message type %d size %d", hdr->MessageType, size);
|
|
|
|
if (hdr->MessageType >= ChannelMessageCount) {
|
|
DPRINT_ERR(VMBUS,
|
|
"Received invalid channel message type %d size %d",
|
|
hdr->MessageType, size);
|
|
print_hex_dump_bytes("", DUMP_PREFIX_NONE,
|
|
(unsigned char *)msg->u.Payload, size);
|
|
kfree(msg);
|
|
return;
|
|
}
|
|
|
|
if (gChannelMessageTable[hdr->MessageType].messageHandler)
|
|
gChannelMessageTable[hdr->MessageType].messageHandler(hdr);
|
|
else
|
|
DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
|
|
hdr->MessageType);
|
|
|
|
/* Free the msg that was allocated in VmbusOnMsgDPC() */
|
|
kfree(msg);
|
|
DPRINT_EXIT(VMBUS);
|
|
}
|
|
|
|
/*
|
|
* VmbusChannelRequestOffers - Send a request to get all our pending offers.
|
|
*/
|
|
int VmbusChannelRequestOffers(void)
|
|
{
|
|
struct vmbus_channel_message_header *msg;
|
|
struct vmbus_channel_msginfo *msgInfo;
|
|
int ret;
|
|
|
|
DPRINT_ENTER(VMBUS);
|
|
|
|
msgInfo = kmalloc(sizeof(*msgInfo) +
|
|
sizeof(struct vmbus_channel_message_header),
|
|
GFP_KERNEL);
|
|
if (!msgInfo)
|
|
return -ENOMEM;
|
|
|
|
msgInfo->WaitEvent = osd_WaitEventCreate();
|
|
if (!msgInfo->WaitEvent) {
|
|
kfree(msgInfo);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
msg = (struct vmbus_channel_message_header *)msgInfo->Msg;
|
|
|
|
msg->MessageType = ChannelMessageRequestOffers;
|
|
|
|
/*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_WaitEventWait(msgInfo->waitEvent); */
|
|
|
|
/*SpinlockAcquire(gVmbusConnection.channelMsgLock);
|
|
REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
|
|
SpinlockRelease(gVmbusConnection.channelMsgLock);*/
|
|
|
|
|
|
Cleanup:
|
|
if (msgInfo) {
|
|
kfree(msgInfo->WaitEvent);
|
|
kfree(msgInfo);
|
|
}
|
|
|
|
DPRINT_EXIT(VMBUS);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* VmbusChannelReleaseUnattachedChannels - Release channels that are
|
|
* unattached/unconnected ie (no drivers associated)
|
|
*/
|
|
void VmbusChannelReleaseUnattachedChannels(void)
|
|
{
|
|
struct vmbus_channel *channel, *pos;
|
|
struct vmbus_channel *start = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
|
|
|
|
list_for_each_entry_safe(channel, pos, &gVmbusConnection.ChannelList,
|
|
ListEntry) {
|
|
if (channel == start)
|
|
break;
|
|
|
|
if (!channel->DeviceObject->Driver) {
|
|
list_del(&channel->ListEntry);
|
|
DPRINT_INFO(VMBUS,
|
|
"Releasing unattached device object %p",
|
|
channel->DeviceObject);
|
|
|
|
VmbusChildDeviceRemove(channel->DeviceObject);
|
|
FreeVmbusChannel(channel);
|
|
} else {
|
|
if (!start)
|
|
start = channel;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
|
|
}
|
|
|
|
/* eof */
|