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Hank Janssenc88c4e42010-05-04 15:55:05 -07001/*
2 * Copyright (c) 2010, Microsoft Corporation.
3 *
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.
7 *
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
11 * more details.
12 *
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.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 */
Hank Janssenaf7a5b62011-03-29 13:58:49 -070021#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
Hank Janssenc88c4e42010-05-04 15:55:05 -070023#include <linux/kernel.h>
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/slab.h>
27#include <linux/sysctl.h>
Greg Kroah-Hartman9e629072010-05-04 08:26:23 -070028#include <linux/reboot.h>
Greg Kroah-Hartman46a97192011-10-04 12:29:52 -070029#include <linux/hyperv.h>
Hank Janssenc88c4e42010-05-04 15:55:05 -070030
K. Y. Srinivasan013254762014-02-16 11:34:30 -080031#include "hyperv_vmbus.h"
K. Y. Srinivasan67413352013-07-02 10:31:30 -070032
K. Y. Srinivasan3a491602013-09-06 11:49:56 -070033#define SD_MAJOR 3
34#define SD_MINOR 0
35#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
K. Y. Srinivasan67413352013-07-02 10:31:30 -070036
K. Y. Srinivasan3a491602013-09-06 11:49:56 -070037#define SD_WS2008_MAJOR 1
38#define SD_WS2008_VERSION (SD_WS2008_MAJOR << 16 | SD_MINOR)
39
40#define TS_MAJOR 3
41#define TS_MINOR 0
42#define TS_VERSION (TS_MAJOR << 16 | TS_MINOR)
43
44#define TS_WS2008_MAJOR 1
45#define TS_WS2008_VERSION (TS_WS2008_MAJOR << 16 | TS_MINOR)
46
47#define HB_MAJOR 3
48#define HB_MINOR 0
49#define HB_VERSION (HB_MAJOR << 16 | HB_MINOR)
50
51#define HB_WS2008_MAJOR 1
52#define HB_WS2008_VERSION (HB_WS2008_MAJOR << 16 | HB_MINOR)
53
54static int sd_srv_version;
55static int ts_srv_version;
56static int hb_srv_version;
57static int util_fw_version;
K. Y. Srinivasan67413352013-07-02 10:31:30 -070058
K. Y. Srinivasana29b6432011-09-18 10:31:33 -070059static void shutdown_onchannelcallback(void *context);
60static struct hv_util_service util_shutdown = {
61 .util_cb = shutdown_onchannelcallback,
62};
63
64static void timesync_onchannelcallback(void *context);
65static struct hv_util_service util_timesynch = {
66 .util_cb = timesync_onchannelcallback,
67};
68
69static void heartbeat_onchannelcallback(void *context);
70static struct hv_util_service util_heartbeat = {
71 .util_cb = heartbeat_onchannelcallback,
72};
73
74static struct hv_util_service util_kvp = {
75 .util_cb = hv_kvp_onchannelcallback,
76 .util_init = hv_kvp_init,
77 .util_deinit = hv_kvp_deinit,
78};
Hank Janssenc88c4e42010-05-04 15:55:05 -070079
K. Y. Srinivasan96dd86f2013-03-15 12:30:06 -070080static struct hv_util_service util_vss = {
81 .util_cb = hv_vss_onchannelcallback,
82 .util_init = hv_vss_init,
83 .util_deinit = hv_vss_deinit,
84};
85
K. Y. Srinivasan013254762014-02-16 11:34:30 -080086static struct hv_util_service util_fcopy = {
87 .util_cb = hv_fcopy_onchannelcallback,
88 .util_init = hv_fcopy_init,
89 .util_deinit = hv_fcopy_deinit,
90};
91
K. Y. Srinivasan3dd6cb42013-01-23 17:42:45 -080092static void perform_shutdown(struct work_struct *dummy)
93{
94 orderly_poweroff(true);
95}
96
97/*
98 * Perform the shutdown operation in a thread context.
99 */
100static DECLARE_WORK(shutdown_work, perform_shutdown);
101
Greg Kroah-Hartman66109442010-05-04 14:31:18 -0700102static void shutdown_onchannelcallback(void *context)
Hank Janssenc88c4e42010-05-04 15:55:05 -0700103{
104 struct vmbus_channel *channel = context;
Hank Janssen45241e52010-12-13 16:23:36 -0800105 u32 recvlen;
Hank Janssenc88c4e42010-05-04 15:55:05 -0700106 u64 requestid;
Peter Senna Tschudin31734632013-09-22 00:27:34 +0200107 bool execute_shutdown = false;
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700108 u8 *shut_txf_buf = util_shutdown.recv_buffer;
Hank Janssenc88c4e42010-05-04 15:55:05 -0700109
110 struct shutdown_msg_data *shutdown_msg;
111
112 struct icmsg_hdr *icmsghdrp;
113 struct icmsg_negotiate *negop = NULL;
114
Hank Janssen45241e52010-12-13 16:23:36 -0800115 vmbus_recvpacket(channel, shut_txf_buf,
116 PAGE_SIZE, &recvlen, &requestid);
Hank Janssenc88c4e42010-05-04 15:55:05 -0700117
118 if (recvlen > 0) {
Hank Janssen45241e52010-12-13 16:23:36 -0800119 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
Hank Janssenc88c4e42010-05-04 15:55:05 -0700120 sizeof(struct vmbuspipe_hdr)];
121
122 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -0700123 vmbus_prep_negotiate_resp(icmsghdrp, negop,
K. Y. Srinivasan3a491602013-09-06 11:49:56 -0700124 shut_txf_buf, util_fw_version,
125 sd_srv_version);
Hank Janssenc88c4e42010-05-04 15:55:05 -0700126 } else {
Hank Janssen45241e52010-12-13 16:23:36 -0800127 shutdown_msg =
128 (struct shutdown_msg_data *)&shut_txf_buf[
129 sizeof(struct vmbuspipe_hdr) +
130 sizeof(struct icmsg_hdr)];
Hank Janssenc88c4e42010-05-04 15:55:05 -0700131
132 switch (shutdown_msg->flags) {
133 case 0:
134 case 1:
135 icmsghdrp->status = HV_S_OK;
136 execute_shutdown = true;
137
Hank Janssenaf7a5b62011-03-29 13:58:49 -0700138 pr_info("Shutdown request received -"
Greg Kroah-Hartman32235b02011-04-13 12:14:05 -0700139 " graceful shutdown initiated\n");
Hank Janssenc88c4e42010-05-04 15:55:05 -0700140 break;
141 default:
142 icmsghdrp->status = HV_E_FAIL;
143 execute_shutdown = false;
144
Hank Janssenaf7a5b62011-03-29 13:58:49 -0700145 pr_info("Shutdown request received -"
146 " Invalid request\n");
Hank Janssenc88c4e42010-05-04 15:55:05 -0700147 break;
Joe Perches95cd17c2011-04-10 14:31:35 -0700148 }
Hank Janssenc88c4e42010-05-04 15:55:05 -0700149 }
150
151 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
152 | ICMSGHDRFLAG_RESPONSE;
153
Hank Janssen45241e52010-12-13 16:23:36 -0800154 vmbus_sendpacket(channel, shut_txf_buf,
Hank Janssenc88c4e42010-05-04 15:55:05 -0700155 recvlen, requestid,
Haiyang Zhang415f2282011-01-26 12:12:13 -0800156 VM_PKT_DATA_INBAND, 0);
Hank Janssenc88c4e42010-05-04 15:55:05 -0700157 }
158
Hank Janssenc88c4e42010-05-04 15:55:05 -0700159 if (execute_shutdown == true)
K. Y. Srinivasan3dd6cb42013-01-23 17:42:45 -0800160 schedule_work(&shutdown_work);
Hank Janssenc88c4e42010-05-04 15:55:05 -0700161}
162
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000163/*
Haiyang Zhange9ec3602010-05-11 15:11:24 +0000164 * Set guest time to host UTC time.
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000165 */
Haiyang Zhange9ec3602010-05-11 15:11:24 +0000166static inline void do_adj_guesttime(u64 hosttime)
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000167{
168 s64 host_tns;
169 struct timespec host_ts;
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000170
171 host_tns = (hosttime - WLTIMEDELTA) * 100;
172 host_ts = ns_to_timespec(host_tns);
173
Haiyang Zhange9ec3602010-05-11 15:11:24 +0000174 do_settimeofday(&host_ts);
175}
176
177/*
K. Y. Srinivasan95ff7cd2011-08-27 11:31:31 -0700178 * Set the host time in a process context.
179 */
180
181struct adj_time_work {
182 struct work_struct work;
183 u64 host_time;
184};
185
186static void hv_set_host_time(struct work_struct *work)
187{
188 struct adj_time_work *wrk;
189
190 wrk = container_of(work, struct adj_time_work, work);
191 do_adj_guesttime(wrk->host_time);
192 kfree(wrk);
193}
194
195/*
Haiyang Zhange9ec3602010-05-11 15:11:24 +0000196 * Synchronize time with host after reboot, restore, etc.
197 *
198 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
199 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
200 * message after the timesync channel is opened. Since the hv_utils module is
201 * loaded after hv_vmbus, the first message is usually missed. The other
202 * thing is, systime is automatically set to emulated hardware clock which may
203 * not be UTC time or in the same time zone. So, to override these effects, we
204 * use the first 50 time samples for initial system time setting.
205 */
206static inline void adj_guesttime(u64 hosttime, u8 flags)
207{
K. Y. Srinivasan95ff7cd2011-08-27 11:31:31 -0700208 struct adj_time_work *wrk;
Haiyang Zhange9ec3602010-05-11 15:11:24 +0000209 static s32 scnt = 50;
210
K. Y. Srinivasan95ff7cd2011-08-27 11:31:31 -0700211 wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
212 if (wrk == NULL)
213 return;
214
215 wrk->host_time = hosttime;
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000216 if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
K. Y. Srinivasan95ff7cd2011-08-27 11:31:31 -0700217 INIT_WORK(&wrk->work, hv_set_host_time);
218 schedule_work(&wrk->work);
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000219 return;
220 }
221
Haiyang Zhange9ec3602010-05-11 15:11:24 +0000222 if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000223 scnt--;
K. Y. Srinivasan95ff7cd2011-08-27 11:31:31 -0700224 INIT_WORK(&wrk->work, hv_set_host_time);
225 schedule_work(&wrk->work);
226 } else
227 kfree(wrk);
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000228}
229
230/*
231 * Time Sync Channel message handler.
232 */
233static void timesync_onchannelcallback(void *context)
234{
235 struct vmbus_channel *channel = context;
Hank Janssen45241e52010-12-13 16:23:36 -0800236 u32 recvlen;
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000237 u64 requestid;
238 struct icmsg_hdr *icmsghdrp;
239 struct ictimesync_data *timedatap;
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700240 u8 *time_txf_buf = util_timesynch.recv_buffer;
K. Y. Srinivasan3a491602013-09-06 11:49:56 -0700241 struct icmsg_negotiate *negop = NULL;
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000242
Hank Janssen45241e52010-12-13 16:23:36 -0800243 vmbus_recvpacket(channel, time_txf_buf,
244 PAGE_SIZE, &recvlen, &requestid);
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000245
246 if (recvlen > 0) {
Hank Janssen45241e52010-12-13 16:23:36 -0800247 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000248 sizeof(struct vmbuspipe_hdr)];
249
250 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
K. Y. Srinivasan3a491602013-09-06 11:49:56 -0700251 vmbus_prep_negotiate_resp(icmsghdrp, negop,
252 time_txf_buf,
253 util_fw_version,
254 ts_srv_version);
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000255 } else {
Hank Janssen45241e52010-12-13 16:23:36 -0800256 timedatap = (struct ictimesync_data *)&time_txf_buf[
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000257 sizeof(struct vmbuspipe_hdr) +
258 sizeof(struct icmsg_hdr)];
259 adj_guesttime(timedatap->parenttime, timedatap->flags);
260 }
261
262 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
263 | ICMSGHDRFLAG_RESPONSE;
264
Hank Janssen45241e52010-12-13 16:23:36 -0800265 vmbus_sendpacket(channel, time_txf_buf,
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000266 recvlen, requestid,
Haiyang Zhang415f2282011-01-26 12:12:13 -0800267 VM_PKT_DATA_INBAND, 0);
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000268 }
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000269}
270
Hank Janssen9153f7b2010-05-15 14:39:58 -0700271/*
272 * Heartbeat functionality.
273 * Every two seconds, Hyper-V send us a heartbeat request message.
274 * we respond to this message, and Hyper-V knows we are alive.
275 */
276static void heartbeat_onchannelcallback(void *context)
277{
278 struct vmbus_channel *channel = context;
Hank Janssen45241e52010-12-13 16:23:36 -0800279 u32 recvlen;
Hank Janssen9153f7b2010-05-15 14:39:58 -0700280 u64 requestid;
281 struct icmsg_hdr *icmsghdrp;
282 struct heartbeat_msg_data *heartbeat_msg;
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700283 u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
K. Y. Srinivasan3a491602013-09-06 11:49:56 -0700284 struct icmsg_negotiate *negop = NULL;
Hank Janssen9153f7b2010-05-15 14:39:58 -0700285
Hank Janssen45241e52010-12-13 16:23:36 -0800286 vmbus_recvpacket(channel, hbeat_txf_buf,
287 PAGE_SIZE, &recvlen, &requestid);
Hank Janssen9153f7b2010-05-15 14:39:58 -0700288
289 if (recvlen > 0) {
Hank Janssen45241e52010-12-13 16:23:36 -0800290 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
Hank Janssen9153f7b2010-05-15 14:39:58 -0700291 sizeof(struct vmbuspipe_hdr)];
292
293 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
K. Y. Srinivasan3a491602013-09-06 11:49:56 -0700294 vmbus_prep_negotiate_resp(icmsghdrp, negop,
295 hbeat_txf_buf, util_fw_version,
296 hb_srv_version);
Hank Janssen9153f7b2010-05-15 14:39:58 -0700297 } else {
Hank Janssen45241e52010-12-13 16:23:36 -0800298 heartbeat_msg =
299 (struct heartbeat_msg_data *)&hbeat_txf_buf[
300 sizeof(struct vmbuspipe_hdr) +
301 sizeof(struct icmsg_hdr)];
Hank Janssen9153f7b2010-05-15 14:39:58 -0700302
Hank Janssen9153f7b2010-05-15 14:39:58 -0700303 heartbeat_msg->seq_num += 1;
304 }
305
306 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
307 | ICMSGHDRFLAG_RESPONSE;
308
Hank Janssen45241e52010-12-13 16:23:36 -0800309 vmbus_sendpacket(channel, hbeat_txf_buf,
Hank Janssen9153f7b2010-05-15 14:39:58 -0700310 recvlen, requestid,
Haiyang Zhang415f2282011-01-26 12:12:13 -0800311 VM_PKT_DATA_INBAND, 0);
Hank Janssen9153f7b2010-05-15 14:39:58 -0700312 }
Hank Janssen9153f7b2010-05-15 14:39:58 -0700313}
Haiyang Zhang39c4e9c2010-05-05 19:23:46 +0000314
K. Y. Srinivasan84946892011-09-13 10:59:38 -0700315static int util_probe(struct hv_device *dev,
316 const struct hv_vmbus_device_id *dev_id)
K. Y. Srinivasan283f2122011-08-25 09:48:36 -0700317{
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700318 struct hv_util_service *srv =
319 (struct hv_util_service *)dev_id->driver_data;
320 int ret;
321
K. Y. Srinivasan9bd2d0d2014-07-07 16:34:25 -0700322 srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700323 if (!srv->recv_buffer)
324 return -ENOMEM;
325 if (srv->util_init) {
326 ret = srv->util_init(srv);
327 if (ret) {
K. Y. Srinivasan4e65f6e2011-09-18 10:31:34 -0700328 ret = -ENODEV;
329 goto error1;
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700330 }
331 }
332
K. Y. Srinivasan7ae3e032012-12-01 06:46:34 -0800333 /*
334 * The set of services managed by the util driver are not performance
335 * critical and do not need batched reading. Furthermore, some services
336 * such as KVP can only handle one message from the host at a time.
337 * Turn off batched reading for all util drivers before we open the
338 * channel.
339 */
340
341 set_channel_read_state(dev->channel, false);
342
K. Y. Srinivasan9b595782012-08-13 10:06:51 -0700343 ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
K. Y. Srinivasan4e65f6e2011-09-18 10:31:34 -0700344 srv->util_cb, dev->channel);
345 if (ret)
346 goto error;
347
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700348 hv_set_drvdata(dev, srv);
K. Y. Srinivasan3a491602013-09-06 11:49:56 -0700349 /*
350 * Based on the host; initialize the framework and
351 * service version numbers we will negotiate.
352 */
353 switch (vmbus_proto_version) {
354 case (VERSION_WS2008):
355 util_fw_version = UTIL_WS2K8_FW_VERSION;
356 sd_srv_version = SD_WS2008_VERSION;
357 ts_srv_version = TS_WS2008_VERSION;
358 hb_srv_version = HB_WS2008_VERSION;
359 break;
360
361 default:
362 util_fw_version = UTIL_FW_VERSION;
363 sd_srv_version = SD_VERSION;
364 ts_srv_version = TS_VERSION;
365 hb_srv_version = HB_VERSION;
366 }
367
K. Y. Srinivasan283f2122011-08-25 09:48:36 -0700368 return 0;
K. Y. Srinivasan4e65f6e2011-09-18 10:31:34 -0700369
370error:
371 if (srv->util_deinit)
372 srv->util_deinit();
373error1:
374 kfree(srv->recv_buffer);
375 return ret;
K. Y. Srinivasan283f2122011-08-25 09:48:36 -0700376}
377
378static int util_remove(struct hv_device *dev)
379{
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700380 struct hv_util_service *srv = hv_get_drvdata(dev);
381
K. Y. Srinivasan4e65f6e2011-09-18 10:31:34 -0700382 vmbus_close(dev->channel);
K. Y. Srinivasana29b6432011-09-18 10:31:33 -0700383 if (srv->util_deinit)
384 srv->util_deinit();
385 kfree(srv->recv_buffer);
386
K. Y. Srinivasan283f2122011-08-25 09:48:36 -0700387 return 0;
388}
389
390static const struct hv_vmbus_device_id id_table[] = {
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -0700391 /* Shutdown guid */
K. Y. Srinivasand13984e2013-01-23 17:42:41 -0800392 { HV_SHUTDOWN_GUID,
393 .driver_data = (unsigned long)&util_shutdown
394 },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -0700395 /* Time synch guid */
K. Y. Srinivasand13984e2013-01-23 17:42:41 -0800396 { HV_TS_GUID,
397 .driver_data = (unsigned long)&util_timesynch
398 },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -0700399 /* Heartbeat guid */
K. Y. Srinivasand13984e2013-01-23 17:42:41 -0800400 { HV_HEART_BEAT_GUID,
401 .driver_data = (unsigned long)&util_heartbeat
402 },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -0700403 /* KVP guid */
K. Y. Srinivasand13984e2013-01-23 17:42:41 -0800404 { HV_KVP_GUID,
405 .driver_data = (unsigned long)&util_kvp
406 },
K. Y. Srinivasan96dd86f2013-03-15 12:30:06 -0700407 /* VSS GUID */
408 { HV_VSS_GUID,
409 .driver_data = (unsigned long)&util_vss
410 },
K. Y. Srinivasan013254762014-02-16 11:34:30 -0800411 /* File copy GUID */
412 { HV_FCOPY_GUID,
413 .driver_data = (unsigned long)&util_fcopy
414 },
Greg Kroah-Hartmanc45cf2d2011-08-25 11:41:33 -0700415 { },
K. Y. Srinivasan283f2122011-08-25 09:48:36 -0700416};
417
418MODULE_DEVICE_TABLE(vmbus, id_table);
419
420/* The one and only one */
421static struct hv_driver util_drv = {
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -0700422 .name = "hv_util",
K. Y. Srinivasan283f2122011-08-25 09:48:36 -0700423 .id_table = id_table,
424 .probe = util_probe,
425 .remove = util_remove,
426};
427
Hank Janssenc88c4e42010-05-04 15:55:05 -0700428static int __init init_hyperv_utils(void)
429{
Hank Janssenaf7a5b62011-03-29 13:58:49 -0700430 pr_info("Registering HyperV Utility Driver\n");
Hank Janssenc88c4e42010-05-04 15:55:05 -0700431
K. Y. Srinivasan4e65f6e2011-09-18 10:31:34 -0700432 return vmbus_driver_register(&util_drv);
Hank Janssenc88c4e42010-05-04 15:55:05 -0700433}
434
435static void exit_hyperv_utils(void)
436{
Hank Janssenaf7a5b62011-03-29 13:58:49 -0700437 pr_info("De-Registered HyperV Utility Driver\n");
Hank Janssenc88c4e42010-05-04 15:55:05 -0700438
Greg Kroah-Hartman768fa212011-08-25 15:07:32 -0700439 vmbus_driver_unregister(&util_drv);
Hank Janssenc88c4e42010-05-04 15:55:05 -0700440}
441
442module_init(init_hyperv_utils);
443module_exit(exit_hyperv_utils);
444
445MODULE_DESCRIPTION("Hyper-V Utilities");
Hank Janssenc88c4e42010-05-04 15:55:05 -0700446MODULE_LICENSE("GPL");