Loading...
1/*
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 */
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include <linux/kernel.h>
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/slab.h>
27#include <linux/sysctl.h>
28#include <linux/reboot.h>
29#include <linux/hyperv.h>
30
31#include "hyperv_vmbus.h"
32
33#define SD_MAJOR 3
34#define SD_MINOR 0
35#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
36
37#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;
58
59static 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};
79
80static 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
86static 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
92static 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
102static void shutdown_onchannelcallback(void *context)
103{
104 struct vmbus_channel *channel = context;
105 u32 recvlen;
106 u64 requestid;
107 bool execute_shutdown = false;
108 u8 *shut_txf_buf = util_shutdown.recv_buffer;
109
110 struct shutdown_msg_data *shutdown_msg;
111
112 struct icmsg_hdr *icmsghdrp;
113 struct icmsg_negotiate *negop = NULL;
114
115 vmbus_recvpacket(channel, shut_txf_buf,
116 PAGE_SIZE, &recvlen, &requestid);
117
118 if (recvlen > 0) {
119 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
120 sizeof(struct vmbuspipe_hdr)];
121
122 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
123 vmbus_prep_negotiate_resp(icmsghdrp, negop,
124 shut_txf_buf, util_fw_version,
125 sd_srv_version);
126 } else {
127 shutdown_msg =
128 (struct shutdown_msg_data *)&shut_txf_buf[
129 sizeof(struct vmbuspipe_hdr) +
130 sizeof(struct icmsg_hdr)];
131
132 switch (shutdown_msg->flags) {
133 case 0:
134 case 1:
135 icmsghdrp->status = HV_S_OK;
136 execute_shutdown = true;
137
138 pr_info("Shutdown request received -"
139 " graceful shutdown initiated\n");
140 break;
141 default:
142 icmsghdrp->status = HV_E_FAIL;
143 execute_shutdown = false;
144
145 pr_info("Shutdown request received -"
146 " Invalid request\n");
147 break;
148 }
149 }
150
151 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
152 | ICMSGHDRFLAG_RESPONSE;
153
154 vmbus_sendpacket(channel, shut_txf_buf,
155 recvlen, requestid,
156 VM_PKT_DATA_INBAND, 0);
157 }
158
159 if (execute_shutdown == true)
160 schedule_work(&shutdown_work);
161}
162
163/*
164 * Set guest time to host UTC time.
165 */
166static inline void do_adj_guesttime(u64 hosttime)
167{
168 s64 host_tns;
169 struct timespec host_ts;
170
171 host_tns = (hosttime - WLTIMEDELTA) * 100;
172 host_ts = ns_to_timespec(host_tns);
173
174 do_settimeofday(&host_ts);
175}
176
177/*
178 * 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/*
196 * 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{
208 struct adj_time_work *wrk;
209 static s32 scnt = 50;
210
211 wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
212 if (wrk == NULL)
213 return;
214
215 wrk->host_time = hosttime;
216 if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
217 INIT_WORK(&wrk->work, hv_set_host_time);
218 schedule_work(&wrk->work);
219 return;
220 }
221
222 if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
223 scnt--;
224 INIT_WORK(&wrk->work, hv_set_host_time);
225 schedule_work(&wrk->work);
226 } else
227 kfree(wrk);
228}
229
230/*
231 * Time Sync Channel message handler.
232 */
233static void timesync_onchannelcallback(void *context)
234{
235 struct vmbus_channel *channel = context;
236 u32 recvlen;
237 u64 requestid;
238 struct icmsg_hdr *icmsghdrp;
239 struct ictimesync_data *timedatap;
240 u8 *time_txf_buf = util_timesynch.recv_buffer;
241 struct icmsg_negotiate *negop = NULL;
242
243 vmbus_recvpacket(channel, time_txf_buf,
244 PAGE_SIZE, &recvlen, &requestid);
245
246 if (recvlen > 0) {
247 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
248 sizeof(struct vmbuspipe_hdr)];
249
250 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
251 vmbus_prep_negotiate_resp(icmsghdrp, negop,
252 time_txf_buf,
253 util_fw_version,
254 ts_srv_version);
255 } else {
256 timedatap = (struct ictimesync_data *)&time_txf_buf[
257 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
265 vmbus_sendpacket(channel, time_txf_buf,
266 recvlen, requestid,
267 VM_PKT_DATA_INBAND, 0);
268 }
269}
270
271/*
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;
279 u32 recvlen;
280 u64 requestid;
281 struct icmsg_hdr *icmsghdrp;
282 struct heartbeat_msg_data *heartbeat_msg;
283 u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
284 struct icmsg_negotiate *negop = NULL;
285
286 vmbus_recvpacket(channel, hbeat_txf_buf,
287 PAGE_SIZE, &recvlen, &requestid);
288
289 if (recvlen > 0) {
290 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
291 sizeof(struct vmbuspipe_hdr)];
292
293 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
294 vmbus_prep_negotiate_resp(icmsghdrp, negop,
295 hbeat_txf_buf, util_fw_version,
296 hb_srv_version);
297 } else {
298 heartbeat_msg =
299 (struct heartbeat_msg_data *)&hbeat_txf_buf[
300 sizeof(struct vmbuspipe_hdr) +
301 sizeof(struct icmsg_hdr)];
302
303 heartbeat_msg->seq_num += 1;
304 }
305
306 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
307 | ICMSGHDRFLAG_RESPONSE;
308
309 vmbus_sendpacket(channel, hbeat_txf_buf,
310 recvlen, requestid,
311 VM_PKT_DATA_INBAND, 0);
312 }
313}
314
315static int util_probe(struct hv_device *dev,
316 const struct hv_vmbus_device_id *dev_id)
317{
318 struct hv_util_service *srv =
319 (struct hv_util_service *)dev_id->driver_data;
320 int ret;
321
322 srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
323 if (!srv->recv_buffer)
324 return -ENOMEM;
325 srv->channel = dev->channel;
326 if (srv->util_init) {
327 ret = srv->util_init(srv);
328 if (ret) {
329 ret = -ENODEV;
330 goto error1;
331 }
332 }
333
334 /*
335 * The set of services managed by the util driver are not performance
336 * critical and do not need batched reading. Furthermore, some services
337 * such as KVP can only handle one message from the host at a time.
338 * Turn off batched reading for all util drivers before we open the
339 * channel.
340 */
341
342 set_channel_read_state(dev->channel, false);
343
344 hv_set_drvdata(dev, srv);
345
346 /*
347 * Based on the host; initialize the framework and
348 * service version numbers we will negotiate.
349 */
350 switch (vmbus_proto_version) {
351 case (VERSION_WS2008):
352 util_fw_version = UTIL_WS2K8_FW_VERSION;
353 sd_srv_version = SD_WS2008_VERSION;
354 ts_srv_version = TS_WS2008_VERSION;
355 hb_srv_version = HB_WS2008_VERSION;
356 break;
357
358 default:
359 util_fw_version = UTIL_FW_VERSION;
360 sd_srv_version = SD_VERSION;
361 ts_srv_version = TS_VERSION;
362 hb_srv_version = HB_VERSION;
363 }
364
365 ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
366 srv->util_cb, dev->channel);
367 if (ret)
368 goto error;
369
370 return 0;
371
372error:
373 if (srv->util_deinit)
374 srv->util_deinit();
375error1:
376 kfree(srv->recv_buffer);
377 return ret;
378}
379
380static int util_remove(struct hv_device *dev)
381{
382 struct hv_util_service *srv = hv_get_drvdata(dev);
383
384 if (srv->util_deinit)
385 srv->util_deinit();
386 vmbus_close(dev->channel);
387 kfree(srv->recv_buffer);
388
389 return 0;
390}
391
392static const struct hv_vmbus_device_id id_table[] = {
393 /* Shutdown guid */
394 { HV_SHUTDOWN_GUID,
395 .driver_data = (unsigned long)&util_shutdown
396 },
397 /* Time synch guid */
398 { HV_TS_GUID,
399 .driver_data = (unsigned long)&util_timesynch
400 },
401 /* Heartbeat guid */
402 { HV_HEART_BEAT_GUID,
403 .driver_data = (unsigned long)&util_heartbeat
404 },
405 /* KVP guid */
406 { HV_KVP_GUID,
407 .driver_data = (unsigned long)&util_kvp
408 },
409 /* VSS GUID */
410 { HV_VSS_GUID,
411 .driver_data = (unsigned long)&util_vss
412 },
413 /* File copy GUID */
414 { HV_FCOPY_GUID,
415 .driver_data = (unsigned long)&util_fcopy
416 },
417 { },
418};
419
420MODULE_DEVICE_TABLE(vmbus, id_table);
421
422/* The one and only one */
423static struct hv_driver util_drv = {
424 .name = "hv_util",
425 .id_table = id_table,
426 .probe = util_probe,
427 .remove = util_remove,
428};
429
430static int __init init_hyperv_utils(void)
431{
432 pr_info("Registering HyperV Utility Driver\n");
433
434 return vmbus_driver_register(&util_drv);
435}
436
437static void exit_hyperv_utils(void)
438{
439 pr_info("De-Registered HyperV Utility Driver\n");
440
441 vmbus_driver_unregister(&util_drv);
442}
443
444module_init(init_hyperv_utils);
445module_exit(exit_hyperv_utils);
446
447MODULE_DESCRIPTION("Hyper-V Utilities");
448MODULE_LICENSE("GPL");
1/*
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 */
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include <linux/kernel.h>
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/slab.h>
27#include <linux/sysctl.h>
28#include <linux/reboot.h>
29#include <linux/hyperv.h>
30
31#include "hyperv_vmbus.h"
32
33#define SD_MAJOR 3
34#define SD_MINOR 0
35#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
36
37#define SD_MAJOR_1 1
38#define SD_VERSION_1 (SD_MAJOR_1 << 16 | SD_MINOR)
39
40#define TS_MAJOR 4
41#define TS_MINOR 0
42#define TS_VERSION (TS_MAJOR << 16 | TS_MINOR)
43
44#define TS_MAJOR_1 1
45#define TS_VERSION_1 (TS_MAJOR_1 << 16 | TS_MINOR)
46
47#define TS_MAJOR_3 3
48#define TS_VERSION_3 (TS_MAJOR_3 << 16 | TS_MINOR)
49
50#define HB_MAJOR 3
51#define HB_MINOR 0
52#define HB_VERSION (HB_MAJOR << 16 | HB_MINOR)
53
54#define HB_MAJOR_1 1
55#define HB_VERSION_1 (HB_MAJOR_1 << 16 | HB_MINOR)
56
57static int sd_srv_version;
58static int ts_srv_version;
59static int hb_srv_version;
60static int util_fw_version;
61
62static void shutdown_onchannelcallback(void *context);
63static struct hv_util_service util_shutdown = {
64 .util_cb = shutdown_onchannelcallback,
65};
66
67static int hv_timesync_init(struct hv_util_service *srv);
68static void hv_timesync_deinit(void);
69
70static void timesync_onchannelcallback(void *context);
71static struct hv_util_service util_timesynch = {
72 .util_cb = timesync_onchannelcallback,
73 .util_init = hv_timesync_init,
74 .util_deinit = hv_timesync_deinit,
75};
76
77static void heartbeat_onchannelcallback(void *context);
78static struct hv_util_service util_heartbeat = {
79 .util_cb = heartbeat_onchannelcallback,
80};
81
82static struct hv_util_service util_kvp = {
83 .util_cb = hv_kvp_onchannelcallback,
84 .util_init = hv_kvp_init,
85 .util_deinit = hv_kvp_deinit,
86};
87
88static struct hv_util_service util_vss = {
89 .util_cb = hv_vss_onchannelcallback,
90 .util_init = hv_vss_init,
91 .util_deinit = hv_vss_deinit,
92};
93
94static struct hv_util_service util_fcopy = {
95 .util_cb = hv_fcopy_onchannelcallback,
96 .util_init = hv_fcopy_init,
97 .util_deinit = hv_fcopy_deinit,
98};
99
100static void perform_shutdown(struct work_struct *dummy)
101{
102 orderly_poweroff(true);
103}
104
105/*
106 * Perform the shutdown operation in a thread context.
107 */
108static DECLARE_WORK(shutdown_work, perform_shutdown);
109
110static void shutdown_onchannelcallback(void *context)
111{
112 struct vmbus_channel *channel = context;
113 u32 recvlen;
114 u64 requestid;
115 bool execute_shutdown = false;
116 u8 *shut_txf_buf = util_shutdown.recv_buffer;
117
118 struct shutdown_msg_data *shutdown_msg;
119
120 struct icmsg_hdr *icmsghdrp;
121 struct icmsg_negotiate *negop = NULL;
122
123 vmbus_recvpacket(channel, shut_txf_buf,
124 PAGE_SIZE, &recvlen, &requestid);
125
126 if (recvlen > 0) {
127 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
128 sizeof(struct vmbuspipe_hdr)];
129
130 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
131 vmbus_prep_negotiate_resp(icmsghdrp, negop,
132 shut_txf_buf, util_fw_version,
133 sd_srv_version);
134 } else {
135 shutdown_msg =
136 (struct shutdown_msg_data *)&shut_txf_buf[
137 sizeof(struct vmbuspipe_hdr) +
138 sizeof(struct icmsg_hdr)];
139
140 switch (shutdown_msg->flags) {
141 case 0:
142 case 1:
143 icmsghdrp->status = HV_S_OK;
144 execute_shutdown = true;
145
146 pr_info("Shutdown request received -"
147 " graceful shutdown initiated\n");
148 break;
149 default:
150 icmsghdrp->status = HV_E_FAIL;
151 execute_shutdown = false;
152
153 pr_info("Shutdown request received -"
154 " Invalid request\n");
155 break;
156 }
157 }
158
159 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
160 | ICMSGHDRFLAG_RESPONSE;
161
162 vmbus_sendpacket(channel, shut_txf_buf,
163 recvlen, requestid,
164 VM_PKT_DATA_INBAND, 0);
165 }
166
167 if (execute_shutdown == true)
168 schedule_work(&shutdown_work);
169}
170
171/*
172 * Set the host time in a process context.
173 */
174
175struct adj_time_work {
176 struct work_struct work;
177 u64 host_time;
178 u64 ref_time;
179 u8 flags;
180};
181
182static void hv_set_host_time(struct work_struct *work)
183{
184 struct adj_time_work *wrk;
185 s64 host_tns;
186 u64 newtime;
187 struct timespec host_ts;
188
189 wrk = container_of(work, struct adj_time_work, work);
190
191 newtime = wrk->host_time;
192 if (ts_srv_version > TS_VERSION_3) {
193 /*
194 * Some latency has been introduced since Hyper-V generated
195 * its time sample. Take that latency into account before
196 * using TSC reference time sample from Hyper-V.
197 *
198 * This sample is given by TimeSync v4 and above hosts.
199 */
200 u64 current_tick;
201
202 rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
203 newtime += (current_tick - wrk->ref_time);
204 }
205 host_tns = (newtime - WLTIMEDELTA) * 100;
206 host_ts = ns_to_timespec(host_tns);
207
208 do_settimeofday(&host_ts);
209}
210
211/*
212 * Synchronize time with host after reboot, restore, etc.
213 *
214 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
215 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
216 * message after the timesync channel is opened. Since the hv_utils module is
217 * loaded after hv_vmbus, the first message is usually missed. This bit is
218 * considered a hard request to discipline the clock.
219 *
220 * ICTIMESYNCFLAG_SAMPLE bit indicates a time sample from host. This is
221 * typically used as a hint to the guest. The guest is under no obligation
222 * to discipline the clock.
223 */
224static struct adj_time_work wrk;
225static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 flags)
226{
227
228 /*
229 * This check is safe since we are executing in the
230 * interrupt context and time synch messages arre always
231 * delivered on the same CPU.
232 */
233 if (work_pending(&wrk.work))
234 return;
235
236 wrk.host_time = hosttime;
237 wrk.ref_time = reftime;
238 wrk.flags = flags;
239 if ((flags & (ICTIMESYNCFLAG_SYNC | ICTIMESYNCFLAG_SAMPLE)) != 0) {
240 schedule_work(&wrk.work);
241 }
242}
243
244/*
245 * Time Sync Channel message handler.
246 */
247static void timesync_onchannelcallback(void *context)
248{
249 struct vmbus_channel *channel = context;
250 u32 recvlen;
251 u64 requestid;
252 struct icmsg_hdr *icmsghdrp;
253 struct ictimesync_data *timedatap;
254 struct ictimesync_ref_data *refdata;
255 u8 *time_txf_buf = util_timesynch.recv_buffer;
256 struct icmsg_negotiate *negop = NULL;
257
258 vmbus_recvpacket(channel, time_txf_buf,
259 PAGE_SIZE, &recvlen, &requestid);
260
261 if (recvlen > 0) {
262 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
263 sizeof(struct vmbuspipe_hdr)];
264
265 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
266 vmbus_prep_negotiate_resp(icmsghdrp, negop,
267 time_txf_buf,
268 util_fw_version,
269 ts_srv_version);
270 pr_info("Using TimeSync version %d.%d\n",
271 ts_srv_version >> 16, ts_srv_version & 0xFFFF);
272 } else {
273 if (ts_srv_version > TS_VERSION_3) {
274 refdata = (struct ictimesync_ref_data *)
275 &time_txf_buf[
276 sizeof(struct vmbuspipe_hdr) +
277 sizeof(struct icmsg_hdr)];
278
279 adj_guesttime(refdata->parenttime,
280 refdata->vmreferencetime,
281 refdata->flags);
282 } else {
283 timedatap = (struct ictimesync_data *)
284 &time_txf_buf[
285 sizeof(struct vmbuspipe_hdr) +
286 sizeof(struct icmsg_hdr)];
287 adj_guesttime(timedatap->parenttime,
288 0,
289 timedatap->flags);
290 }
291 }
292
293 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
294 | ICMSGHDRFLAG_RESPONSE;
295
296 vmbus_sendpacket(channel, time_txf_buf,
297 recvlen, requestid,
298 VM_PKT_DATA_INBAND, 0);
299 }
300}
301
302/*
303 * Heartbeat functionality.
304 * Every two seconds, Hyper-V send us a heartbeat request message.
305 * we respond to this message, and Hyper-V knows we are alive.
306 */
307static void heartbeat_onchannelcallback(void *context)
308{
309 struct vmbus_channel *channel = context;
310 u32 recvlen;
311 u64 requestid;
312 struct icmsg_hdr *icmsghdrp;
313 struct heartbeat_msg_data *heartbeat_msg;
314 u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
315 struct icmsg_negotiate *negop = NULL;
316
317 while (1) {
318
319 vmbus_recvpacket(channel, hbeat_txf_buf,
320 PAGE_SIZE, &recvlen, &requestid);
321
322 if (!recvlen)
323 break;
324
325 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
326 sizeof(struct vmbuspipe_hdr)];
327
328 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
329 vmbus_prep_negotiate_resp(icmsghdrp, negop,
330 hbeat_txf_buf, util_fw_version,
331 hb_srv_version);
332 } else {
333 heartbeat_msg =
334 (struct heartbeat_msg_data *)&hbeat_txf_buf[
335 sizeof(struct vmbuspipe_hdr) +
336 sizeof(struct icmsg_hdr)];
337
338 heartbeat_msg->seq_num += 1;
339 }
340
341 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
342 | ICMSGHDRFLAG_RESPONSE;
343
344 vmbus_sendpacket(channel, hbeat_txf_buf,
345 recvlen, requestid,
346 VM_PKT_DATA_INBAND, 0);
347 }
348}
349
350static int util_probe(struct hv_device *dev,
351 const struct hv_vmbus_device_id *dev_id)
352{
353 struct hv_util_service *srv =
354 (struct hv_util_service *)dev_id->driver_data;
355 int ret;
356
357 srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
358 if (!srv->recv_buffer)
359 return -ENOMEM;
360 srv->channel = dev->channel;
361 if (srv->util_init) {
362 ret = srv->util_init(srv);
363 if (ret) {
364 ret = -ENODEV;
365 goto error1;
366 }
367 }
368
369 /*
370 * The set of services managed by the util driver are not performance
371 * critical and do not need batched reading. Furthermore, some services
372 * such as KVP can only handle one message from the host at a time.
373 * Turn off batched reading for all util drivers before we open the
374 * channel.
375 */
376
377 set_channel_read_state(dev->channel, false);
378
379 hv_set_drvdata(dev, srv);
380
381 /*
382 * Based on the host; initialize the framework and
383 * service version numbers we will negotiate.
384 */
385 switch (vmbus_proto_version) {
386 case (VERSION_WS2008):
387 util_fw_version = UTIL_WS2K8_FW_VERSION;
388 sd_srv_version = SD_VERSION_1;
389 ts_srv_version = TS_VERSION_1;
390 hb_srv_version = HB_VERSION_1;
391 break;
392 case VERSION_WIN7:
393 case VERSION_WIN8:
394 case VERSION_WIN8_1:
395 util_fw_version = UTIL_FW_VERSION;
396 sd_srv_version = SD_VERSION;
397 ts_srv_version = TS_VERSION_3;
398 hb_srv_version = HB_VERSION;
399 break;
400 case VERSION_WIN10:
401 default:
402 util_fw_version = UTIL_FW_VERSION;
403 sd_srv_version = SD_VERSION;
404 ts_srv_version = TS_VERSION;
405 hb_srv_version = HB_VERSION;
406 }
407
408 ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
409 srv->util_cb, dev->channel);
410 if (ret)
411 goto error;
412
413 return 0;
414
415error:
416 if (srv->util_deinit)
417 srv->util_deinit();
418error1:
419 kfree(srv->recv_buffer);
420 return ret;
421}
422
423static int util_remove(struct hv_device *dev)
424{
425 struct hv_util_service *srv = hv_get_drvdata(dev);
426
427 if (srv->util_deinit)
428 srv->util_deinit();
429 vmbus_close(dev->channel);
430 kfree(srv->recv_buffer);
431
432 return 0;
433}
434
435static const struct hv_vmbus_device_id id_table[] = {
436 /* Shutdown guid */
437 { HV_SHUTDOWN_GUID,
438 .driver_data = (unsigned long)&util_shutdown
439 },
440 /* Time synch guid */
441 { HV_TS_GUID,
442 .driver_data = (unsigned long)&util_timesynch
443 },
444 /* Heartbeat guid */
445 { HV_HEART_BEAT_GUID,
446 .driver_data = (unsigned long)&util_heartbeat
447 },
448 /* KVP guid */
449 { HV_KVP_GUID,
450 .driver_data = (unsigned long)&util_kvp
451 },
452 /* VSS GUID */
453 { HV_VSS_GUID,
454 .driver_data = (unsigned long)&util_vss
455 },
456 /* File copy GUID */
457 { HV_FCOPY_GUID,
458 .driver_data = (unsigned long)&util_fcopy
459 },
460 { },
461};
462
463MODULE_DEVICE_TABLE(vmbus, id_table);
464
465/* The one and only one */
466static struct hv_driver util_drv = {
467 .name = "hv_util",
468 .id_table = id_table,
469 .probe = util_probe,
470 .remove = util_remove,
471};
472
473static int hv_timesync_init(struct hv_util_service *srv)
474{
475 INIT_WORK(&wrk.work, hv_set_host_time);
476 return 0;
477}
478
479static void hv_timesync_deinit(void)
480{
481 cancel_work_sync(&wrk.work);
482}
483
484static int __init init_hyperv_utils(void)
485{
486 pr_info("Registering HyperV Utility Driver\n");
487
488 return vmbus_driver_register(&util_drv);
489}
490
491static void exit_hyperv_utils(void)
492{
493 pr_info("De-Registered HyperV Utility Driver\n");
494
495 vmbus_driver_unregister(&util_drv);
496}
497
498module_init(init_hyperv_utils);
499module_exit(exit_hyperv_utils);
500
501MODULE_DESCRIPTION("Hyper-V Utilities");
502MODULE_LICENSE("GPL");