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"
41 static u8 *shut_txf_buf;
42 static u8 *time_txf_buf;
43 static u8 *hbeat_txf_buf;
45 static void shutdown_onchannelcallback(void *context)
47 struct vmbus_channel *channel = context;
50 u8 execute_shutdown = false;
52 struct shutdown_msg_data *shutdown_msg;
54 struct icmsg_hdr *icmsghdrp;
55 struct icmsg_negotiate *negop = NULL;
57 vmbus_recvpacket(channel, shut_txf_buf,
58 PAGE_SIZE, &recvlen, &requestid);
61 DPRINT_DBG(VMBUS, "shutdown packet: len=%d, requestid=%lld",
64 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
65 sizeof(struct vmbuspipe_hdr)];
67 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
68 prep_negotiate_resp(icmsghdrp, negop, shut_txf_buf);
71 (struct shutdown_msg_data *)&shut_txf_buf[
72 sizeof(struct vmbuspipe_hdr) +
73 sizeof(struct icmsg_hdr)];
75 switch (shutdown_msg->flags) {
78 icmsghdrp->status = HV_S_OK;
79 execute_shutdown = true;
81 DPRINT_INFO(VMBUS, "Shutdown request received -"
82 " gracefull shutdown initiated");
85 icmsghdrp->status = HV_E_FAIL;
86 execute_shutdown = false;
88 DPRINT_INFO(VMBUS, "Shutdown request received -"
94 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
95 | ICMSGHDRFLAG_RESPONSE;
97 vmbus_sendpacket(channel, shut_txf_buf,
99 VmbusPacketTypeDataInBand, 0);
102 if (execute_shutdown == true)
103 orderly_poweroff(false);
107 * Set guest time to host UTC time.
109 static inline void do_adj_guesttime(u64 hosttime)
112 struct timespec host_ts;
114 host_tns = (hosttime - WLTIMEDELTA) * 100;
115 host_ts = ns_to_timespec(host_tns);
117 do_settimeofday(&host_ts);
121 * Synchronize time with host after reboot, restore, etc.
123 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
124 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
125 * message after the timesync channel is opened. Since the hv_utils module is
126 * loaded after hv_vmbus, the first message is usually missed. The other
127 * thing is, systime is automatically set to emulated hardware clock which may
128 * not be UTC time or in the same time zone. So, to override these effects, we
129 * use the first 50 time samples for initial system time setting.
131 static inline void adj_guesttime(u64 hosttime, u8 flags)
133 static s32 scnt = 50;
135 if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
136 do_adj_guesttime(hosttime);
140 if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
142 do_adj_guesttime(hosttime);
147 * Time Sync Channel message handler.
149 static void timesync_onchannelcallback(void *context)
151 struct vmbus_channel *channel = context;
154 struct icmsg_hdr *icmsghdrp;
155 struct ictimesync_data *timedatap;
157 vmbus_recvpacket(channel, time_txf_buf,
158 PAGE_SIZE, &recvlen, &requestid);
161 DPRINT_DBG(VMBUS, "timesync packet: recvlen=%d, requestid=%lld",
164 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
165 sizeof(struct vmbuspipe_hdr)];
167 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
168 prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf);
170 timedatap = (struct ictimesync_data *)&time_txf_buf[
171 sizeof(struct vmbuspipe_hdr) +
172 sizeof(struct icmsg_hdr)];
173 adj_guesttime(timedatap->parenttime, timedatap->flags);
176 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
177 | ICMSGHDRFLAG_RESPONSE;
179 vmbus_sendpacket(channel, time_txf_buf,
181 VmbusPacketTypeDataInBand, 0);
186 * Heartbeat functionality.
187 * Every two seconds, Hyper-V send us a heartbeat request message.
188 * we respond to this message, and Hyper-V knows we are alive.
190 static void heartbeat_onchannelcallback(void *context)
192 struct vmbus_channel *channel = context;
195 struct icmsg_hdr *icmsghdrp;
196 struct heartbeat_msg_data *heartbeat_msg;
198 vmbus_recvpacket(channel, hbeat_txf_buf,
199 PAGE_SIZE, &recvlen, &requestid);
202 DPRINT_DBG(VMBUS, "heartbeat packet: len=%d, requestid=%lld",
205 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
206 sizeof(struct vmbuspipe_hdr)];
208 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
209 prep_negotiate_resp(icmsghdrp, NULL, hbeat_txf_buf);
212 (struct heartbeat_msg_data *)&hbeat_txf_buf[
213 sizeof(struct vmbuspipe_hdr) +
214 sizeof(struct icmsg_hdr)];
216 DPRINT_DBG(VMBUS, "heartbeat seq = %lld",
217 heartbeat_msg->seq_num);
219 heartbeat_msg->seq_num += 1;
222 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
223 | ICMSGHDRFLAG_RESPONSE;
225 vmbus_sendpacket(channel, hbeat_txf_buf,
227 VmbusPacketTypeDataInBand, 0);
231 static const struct pci_device_id __initconst
232 hv_utils_pci_table[] __maybe_unused = {
233 { PCI_DEVICE(0x1414, 0x5353) }, /* Hyper-V emulated VGA controller */
236 MODULE_DEVICE_TABLE(pci, hv_utils_pci_table);
239 static const struct dmi_system_id __initconst
240 hv_utils_dmi_table[] __maybe_unused = {
244 DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
245 DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
246 DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
251 MODULE_DEVICE_TABLE(dmi, hv_utils_dmi_table);
254 static int __init init_hyperv_utils(void)
256 printk(KERN_INFO "Registering HyperV Utility Driver\n");
258 if (!dmi_check_system(hv_utils_dmi_table))
261 shut_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
262 time_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
263 hbeat_txf_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
265 if (!shut_txf_buf || !time_txf_buf || !hbeat_txf_buf) {
267 "Unable to allocate memory for receive buffer\n");
270 kfree(hbeat_txf_buf);
274 hv_cb_utils[HV_SHUTDOWN_MSG].channel->onchannel_callback =
275 &shutdown_onchannelcallback;
276 hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
278 hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
279 ×ync_onchannelcallback;
280 hv_cb_utils[HV_TIMESYNC_MSG].callback = ×ync_onchannelcallback;
282 hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
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->onchannel_callback =
295 hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
297 hv_cb_utils[HV_TIMESYNC_MSG].channel->onchannel_callback =
299 hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate;
301 hv_cb_utils[HV_HEARTBEAT_MSG].channel->onchannel_callback =
303 hv_cb_utils[HV_HEARTBEAT_MSG].callback = &chn_cb_negotiate;
307 kfree(hbeat_txf_buf);
310 module_init(init_hyperv_utils);
311 module_exit(exit_hyperv_utils);
313 MODULE_DESCRIPTION("Hyper-V Utilities");
314 MODULE_VERSION(HV_DRV_VERSION);
315 MODULE_LICENSE("GPL");