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>
27 #include <linux/dmi.h>
28 #include <linux/pci.h>
33 #include "vmbus_packet_format.h"
34 #include "vmbus_channel_interface.h"
35 #include "version_info.h"
37 #include "vmbus_private.h"
38 #include "vmbus_api.h"
42 static void shutdown_onchannelcallback(void *context
)
44 struct vmbus_channel
*channel
= context
;
48 u8 execute_shutdown
= false;
50 struct shutdown_msg_data
*shutdown_msg
;
52 struct icmsg_hdr
*icmsghdrp
;
53 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);
103 if (execute_shutdown
== true)
104 orderly_poweroff(false);
108 * Set guest time to host UTC time.
110 static inline void do_adj_guesttime(u64 hosttime
)
113 struct timespec host_ts
;
115 host_tns
= (hosttime
- WLTIMEDELTA
) * 100;
116 host_ts
= ns_to_timespec(host_tns
);
118 do_settimeofday(&host_ts
);
122 * Synchronize time with host after reboot, restore, etc.
124 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
125 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
126 * message after the timesync channel is opened. Since the hv_utils module is
127 * loaded after hv_vmbus, the first message is usually missed. The other
128 * thing is, systime is automatically set to emulated hardware clock which may
129 * not be UTC time or in the same time zone. So, to override these effects, we
130 * use the first 50 time samples for initial system time setting.
132 static inline void adj_guesttime(u64 hosttime
, u8 flags
)
134 static s32 scnt
= 50;
136 if ((flags
& ICTIMESYNCFLAG_SYNC
) != 0) {
137 do_adj_guesttime(hosttime
);
141 if ((flags
& ICTIMESYNCFLAG_SAMPLE
) != 0 && scnt
> 0) {
143 do_adj_guesttime(hosttime
);
148 * Time Sync Channel message handler.
150 static void timesync_onchannelcallback(void *context
)
152 struct vmbus_channel
*channel
= context
;
156 struct icmsg_hdr
*icmsghdrp
;
157 struct ictimesync_data
*timedatap
;
160 buf
= kmalloc(buflen
, GFP_ATOMIC
);
162 VmbusChannelRecvPacket(channel
, buf
, buflen
, &recvlen
, &requestid
);
165 DPRINT_DBG(VMBUS
, "timesync packet: recvlen=%d, requestid=%lld",
168 icmsghdrp
= (struct icmsg_hdr
*)&buf
[
169 sizeof(struct vmbuspipe_hdr
)];
171 if (icmsghdrp
->icmsgtype
== ICMSGTYPE_NEGOTIATE
) {
172 prep_negotiate_resp(icmsghdrp
, NULL
, buf
);
174 timedatap
= (struct ictimesync_data
*)&buf
[
175 sizeof(struct vmbuspipe_hdr
) +
176 sizeof(struct icmsg_hdr
)];
177 adj_guesttime(timedatap
->parenttime
, timedatap
->flags
);
180 icmsghdrp
->icflags
= ICMSGHDRFLAG_TRANSACTION
181 | ICMSGHDRFLAG_RESPONSE
;
183 VmbusChannelSendPacket(channel
, buf
,
185 VmbusPacketTypeDataInBand
, 0);
192 * Heartbeat functionality.
193 * Every two seconds, Hyper-V send us a heartbeat request message.
194 * we respond to this message, and Hyper-V knows we are alive.
196 static void heartbeat_onchannelcallback(void *context
)
198 struct vmbus_channel
*channel
= context
;
202 struct icmsg_hdr
*icmsghdrp
;
203 struct heartbeat_msg_data
*heartbeat_msg
;
206 buf
= kmalloc(buflen
, GFP_ATOMIC
);
208 VmbusChannelRecvPacket(channel
, buf
, buflen
, &recvlen
, &requestid
);
211 DPRINT_DBG(VMBUS
, "heartbeat packet: len=%d, requestid=%lld",
214 icmsghdrp
= (struct icmsg_hdr
*)&buf
[
215 sizeof(struct vmbuspipe_hdr
)];
217 icmsghdrp
= (struct icmsg_hdr
*)&buf
[
218 sizeof(struct vmbuspipe_hdr
)];
220 if (icmsghdrp
->icmsgtype
== ICMSGTYPE_NEGOTIATE
) {
221 prep_negotiate_resp(icmsghdrp
, NULL
, buf
);
223 heartbeat_msg
= (struct heartbeat_msg_data
*)&buf
[
224 sizeof(struct vmbuspipe_hdr
) +
225 sizeof(struct icmsg_hdr
)];
227 DPRINT_DBG(VMBUS
, "heartbeat seq = %lld",
228 heartbeat_msg
->seq_num
);
230 heartbeat_msg
->seq_num
+= 1;
233 icmsghdrp
->icflags
= ICMSGHDRFLAG_TRANSACTION
234 | ICMSGHDRFLAG_RESPONSE
;
236 VmbusChannelSendPacket(channel
, buf
,
238 VmbusPacketTypeDataInBand
, 0);
244 static const struct pci_device_id __initconst
245 hv_utils_pci_table
[] __maybe_unused
= {
246 { PCI_DEVICE(0x1414, 0x5353) }, /* Hyper-V emulated VGA controller */
249 MODULE_DEVICE_TABLE(pci
, hv_utils_pci_table
);
252 static const struct dmi_system_id __initconst
253 hv_utils_dmi_table
[] __maybe_unused
= {
257 DMI_MATCH(DMI_SYS_VENDOR
, "Microsoft Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME
, "Virtual Machine"),
259 DMI_MATCH(DMI_BOARD_NAME
, "Virtual Machine"),
264 MODULE_DEVICE_TABLE(dmi
, hv_utils_dmi_table
);
267 static int __init
init_hyperv_utils(void)
269 printk(KERN_INFO
"Registering HyperV Utility Driver\n");
271 if (!dmi_check_system(hv_utils_dmi_table
))
274 hv_cb_utils
[HV_SHUTDOWN_MSG
].channel
->OnChannelCallback
=
275 &shutdown_onchannelcallback
;
276 hv_cb_utils
[HV_SHUTDOWN_MSG
].callback
= &shutdown_onchannelcallback
;
278 hv_cb_utils
[HV_TIMESYNC_MSG
].channel
->OnChannelCallback
=
279 ×ync_onchannelcallback
;
280 hv_cb_utils
[HV_TIMESYNC_MSG
].callback
= ×ync_onchannelcallback
;
282 hv_cb_utils
[HV_HEARTBEAT_MSG
].channel
->OnChannelCallback
=
283 &heartbeat_onchannelcallback
;
284 hv_cb_utils
[HV_HEARTBEAT_MSG
].callback
= &heartbeat_onchannelcallback
;
289 static void exit_hyperv_utils(void)
291 printk(KERN_INFO
"De-Registered HyperV Utility Driver\n");
293 hv_cb_utils
[HV_SHUTDOWN_MSG
].channel
->OnChannelCallback
=
295 hv_cb_utils
[HV_SHUTDOWN_MSG
].callback
= &chn_cb_negotiate
;
297 hv_cb_utils
[HV_TIMESYNC_MSG
].channel
->OnChannelCallback
=
299 hv_cb_utils
[HV_TIMESYNC_MSG
].callback
= &chn_cb_negotiate
;
301 hv_cb_utils
[HV_HEARTBEAT_MSG
].channel
->OnChannelCallback
=
303 hv_cb_utils
[HV_HEARTBEAT_MSG
].callback
= &chn_cb_negotiate
;
306 module_init(init_hyperv_utils
);
307 module_exit(exit_hyperv_utils
);
309 MODULE_DESCRIPTION("Hyper-V Utilities");
310 MODULE_VERSION(HV_DRV_VERSION
);
311 MODULE_LICENSE("GPL");