2 * Copyright (c) 2010, Microsoft Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/reboot.h>
31 #include "vmbus_packet_format.h"
32 #include "vmbus_channel_interface.h"
33 #include "version_info.h"
35 #include "vmbus_private.h"
36 #include "vmbus_api.h"
40 static void shutdown_onchannelcallback(void *context)
42 struct vmbus_channel *channel = context;
46 u8 execute_shutdown = false;
48 struct shutdown_msg_data *shutdown_msg;
50 struct icmsg_hdr *icmsghdrp;
51 struct icmsg_negotiate *negop = NULL;
56 buf = kmalloc(buflen, GFP_ATOMIC);
58 VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
61 DPRINT_DBG(VMBUS, "shutdown packet: len=%d, requestid=%lld",
64 icmsghdrp = (struct icmsg_hdr *)&buf[
65 sizeof(struct vmbuspipe_hdr)];
67 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
68 prep_negotiate_resp(icmsghdrp, negop, buf);
70 shutdown_msg = (struct shutdown_msg_data *)&buf[
71 sizeof(struct vmbuspipe_hdr) +
72 sizeof(struct icmsg_hdr)];
74 switch (shutdown_msg->flags) {
77 icmsghdrp->status = HV_S_OK;
78 execute_shutdown = true;
80 DPRINT_INFO(VMBUS, "Shutdown request received -"
81 " gracefull shutdown initiated");
84 icmsghdrp->status = HV_E_FAIL;
85 execute_shutdown = false;
87 DPRINT_INFO(VMBUS, "Shutdown request received -"
93 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
94 | ICMSGHDRFLAG_RESPONSE;
96 VmbusChannelSendPacket(channel, buf,
98 VmbusPacketTypeDataInBand, 0);
105 if (execute_shutdown == true)
106 orderly_poweroff(false);
110 * Set guest time to host UTC time.
112 static inline void do_adj_guesttime(u64 hosttime)
115 struct timespec host_ts;
117 host_tns = (hosttime - WLTIMEDELTA) * 100;
118 host_ts = ns_to_timespec(host_tns);
120 do_settimeofday(&host_ts);
124 * Synchronize time with host after reboot, restore, etc.
126 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
127 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
128 * message after the timesync channel is opened. Since the hv_utils module is
129 * loaded after hv_vmbus, the first message is usually missed. The other
130 * thing is, systime is automatically set to emulated hardware clock which may
131 * not be UTC time or in the same time zone. So, to override these effects, we
132 * use the first 50 time samples for initial system time setting.
134 static inline void adj_guesttime(u64 hosttime, u8 flags)
136 static s32 scnt = 50;
138 if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
139 do_adj_guesttime(hosttime);
143 if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
145 do_adj_guesttime(hosttime);
150 * Time Sync Channel message handler.
152 static void timesync_onchannelcallback(void *context)
154 struct vmbus_channel *channel = context;
158 struct icmsg_hdr *icmsghdrp;
159 struct ictimesync_data *timedatap;
164 buf = kmalloc(buflen, GFP_ATOMIC);
166 VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
169 DPRINT_DBG(VMBUS, "timesync packet: recvlen=%d, requestid=%lld",
172 icmsghdrp = (struct icmsg_hdr *)&buf[
173 sizeof(struct vmbuspipe_hdr)];
175 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
176 prep_negotiate_resp(icmsghdrp, NULL, buf);
178 timedatap = (struct ictimesync_data *)&buf[
179 sizeof(struct vmbuspipe_hdr) +
180 sizeof(struct icmsg_hdr)];
181 adj_guesttime(timedatap->parenttime, timedatap->flags);
184 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
185 | ICMSGHDRFLAG_RESPONSE;
187 VmbusChannelSendPacket(channel, buf,
189 VmbusPacketTypeDataInBand, 0);
198 * Heartbeat functionality.
199 * Every two seconds, Hyper-V send us a heartbeat request message.
200 * we respond to this message, and Hyper-V knows we are alive.
202 static void heartbeat_onchannelcallback(void *context)
204 struct vmbus_channel *channel = context;
208 struct icmsg_hdr *icmsghdrp;
209 struct heartbeat_msg_data *heartbeat_msg;
214 buf = kmalloc(buflen, GFP_ATOMIC);
216 VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
219 DPRINT_DBG(VMBUS, "heartbeat packet: len=%d, requestid=%lld",
222 icmsghdrp = (struct icmsg_hdr *)&buf[
223 sizeof(struct vmbuspipe_hdr)];
225 icmsghdrp = (struct icmsg_hdr *)&buf[
226 sizeof(struct vmbuspipe_hdr)];
228 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
229 prep_negotiate_resp(icmsghdrp, NULL, buf);
231 heartbeat_msg = (struct heartbeat_msg_data *)&buf[
232 sizeof(struct vmbuspipe_hdr) +
233 sizeof(struct icmsg_hdr)];
235 DPRINT_DBG(VMBUS, "heartbeat seq = %lld",
236 heartbeat_msg->seq_num);
238 heartbeat_msg->seq_num += 1;
241 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
242 | ICMSGHDRFLAG_RESPONSE;
244 VmbusChannelSendPacket(channel, buf,
246 VmbusPacketTypeDataInBand, 0);
254 static int __init init_hyperv_utils(void)
256 printk(KERN_INFO "Registering HyperV Utility Driver\n");
258 hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
259 &shutdown_onchannelcallback;
260 hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
262 hv_cb_utils[HV_TIMESYNC_MSG].channel->OnChannelCallback =
263 ×ync_onchannelcallback;
264 hv_cb_utils[HV_TIMESYNC_MSG].callback = ×ync_onchannelcallback;
266 hv_cb_utils[HV_HEARTBEAT_MSG].channel->OnChannelCallback =
267 &heartbeat_onchannelcallback;
268 hv_cb_utils[HV_HEARTBEAT_MSG].callback = &heartbeat_onchannelcallback;
273 static void exit_hyperv_utils(void)
275 printk(KERN_INFO "De-Registered HyperV Utility Driver\n");
277 hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
279 hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
281 hv_cb_utils[HV_TIMESYNC_MSG].channel->OnChannelCallback =
283 hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate;
285 hv_cb_utils[HV_HEARTBEAT_MSG].channel->OnChannelCallback =
287 hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate;
290 module_init(init_hyperv_utils);
291 module_exit(exit_hyperv_utils);
293 MODULE_DESCRIPTION("Hyper-V Utilities");
294 MODULE_VERSION(HV_DRV_VERSION);
295 MODULE_LICENSE("GPL");