1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2010, Microsoft Corporation.
4 *
5 * Authors:
6 * Haiyang Zhang <haiyangz@microsoft.com>
7 * Hank Janssen <hjanssen@microsoft.com>
8 */
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/sysctl.h>
16 #include <linux/reboot.h>
17 #include <linux/hyperv.h>
18 #include <linux/clockchips.h>
19 #include <linux/ptp_clock_kernel.h>
20 #include <clocksource/hyperv_timer.h>
21 #include <asm/mshyperv.h>
22
23 #include "hyperv_vmbus.h"
24
25 #define SD_MAJOR 3
26 #define SD_MINOR 0
27 #define SD_MINOR_1 1
28 #define SD_MINOR_2 2
29 #define SD_VERSION_3_1 (SD_MAJOR << 16 | SD_MINOR_1)
30 #define SD_VERSION_3_2 (SD_MAJOR << 16 | SD_MINOR_2)
31 #define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)
32
33 #define SD_MAJOR_1 1
34 #define SD_VERSION_1 (SD_MAJOR_1 << 16 | SD_MINOR)
35
36 #define TS_MAJOR 4
37 #define TS_MINOR 0
38 #define TS_VERSION (TS_MAJOR << 16 | TS_MINOR)
39
40 #define TS_MAJOR_1 1
41 #define TS_VERSION_1 (TS_MAJOR_1 << 16 | TS_MINOR)
42
43 #define TS_MAJOR_3 3
44 #define TS_VERSION_3 (TS_MAJOR_3 << 16 | TS_MINOR)
45
46 #define HB_MAJOR 3
47 #define HB_MINOR 0
48 #define HB_VERSION (HB_MAJOR << 16 | HB_MINOR)
49
50 #define HB_MAJOR_1 1
51 #define HB_VERSION_1 (HB_MAJOR_1 << 16 | HB_MINOR)
52
53 static int sd_srv_version;
54 static int ts_srv_version;
55 static int hb_srv_version;
56
57 #define SD_VER_COUNT 4
58 static const int sd_versions[] = {
59 SD_VERSION_3_2,
60 SD_VERSION_3_1,
61 SD_VERSION,
62 SD_VERSION_1
63 };
64
65 #define TS_VER_COUNT 3
66 static const int ts_versions[] = {
67 TS_VERSION,
68 TS_VERSION_3,
69 TS_VERSION_1
70 };
71
72 #define HB_VER_COUNT 2
73 static const int hb_versions[] = {
74 HB_VERSION,
75 HB_VERSION_1
76 };
77
78 #define FW_VER_COUNT 2
79 static const int fw_versions[] = {
80 UTIL_FW_VERSION,
81 UTIL_WS2K8_FW_VERSION
82 };
83
84 /*
85 * Send the "hibernate" udev event in a thread context.
86 */
87 struct hibernate_work_context {
88 struct work_struct work;
89 struct hv_device *dev;
90 };
91
92 static struct hibernate_work_context hibernate_context;
93 static bool hibernation_supported;
94
send_hibernate_uevent(struct work_struct * work)95 static void send_hibernate_uevent(struct work_struct *work)
96 {
97 char *uevent_env[2] = { "EVENT=hibernate", NULL };
98 struct hibernate_work_context *ctx;
99
100 ctx = container_of(work, struct hibernate_work_context, work);
101
102 kobject_uevent_env(&ctx->dev->device.kobj, KOBJ_CHANGE, uevent_env);
103
104 pr_info("Sent hibernation uevent\n");
105 }
106
hv_shutdown_init(struct hv_util_service * srv)107 static int hv_shutdown_init(struct hv_util_service *srv)
108 {
109 struct vmbus_channel *channel = srv->channel;
110
111 INIT_WORK(&hibernate_context.work, send_hibernate_uevent);
112 hibernate_context.dev = channel->device_obj;
113
114 hibernation_supported = hv_is_hibernation_supported();
115
116 return 0;
117 }
118
119 static void shutdown_onchannelcallback(void *context);
120 static struct hv_util_service util_shutdown = {
121 .util_cb = shutdown_onchannelcallback,
122 .util_init = hv_shutdown_init,
123 };
124
125 static int hv_timesync_init(struct hv_util_service *srv);
126 static int hv_timesync_pre_suspend(void);
127 static void hv_timesync_deinit(void);
128
129 static void timesync_onchannelcallback(void *context);
130 static struct hv_util_service util_timesynch = {
131 .util_cb = timesync_onchannelcallback,
132 .util_init = hv_timesync_init,
133 .util_pre_suspend = hv_timesync_pre_suspend,
134 .util_deinit = hv_timesync_deinit,
135 };
136
137 static void heartbeat_onchannelcallback(void *context);
138 static struct hv_util_service util_heartbeat = {
139 .util_cb = heartbeat_onchannelcallback,
140 };
141
142 static struct hv_util_service util_kvp = {
143 .util_cb = hv_kvp_onchannelcallback,
144 .util_init = hv_kvp_init,
145 .util_pre_suspend = hv_kvp_pre_suspend,
146 .util_pre_resume = hv_kvp_pre_resume,
147 .util_deinit = hv_kvp_deinit,
148 };
149
150 static struct hv_util_service util_vss = {
151 .util_cb = hv_vss_onchannelcallback,
152 .util_init = hv_vss_init,
153 .util_pre_suspend = hv_vss_pre_suspend,
154 .util_pre_resume = hv_vss_pre_resume,
155 .util_deinit = hv_vss_deinit,
156 };
157
158 static struct hv_util_service util_fcopy = {
159 .util_cb = hv_fcopy_onchannelcallback,
160 .util_init = hv_fcopy_init,
161 .util_pre_suspend = hv_fcopy_pre_suspend,
162 .util_pre_resume = hv_fcopy_pre_resume,
163 .util_deinit = hv_fcopy_deinit,
164 };
165
perform_shutdown(struct work_struct * dummy)166 static void perform_shutdown(struct work_struct *dummy)
167 {
168 orderly_poweroff(true);
169 }
170
perform_restart(struct work_struct * dummy)171 static void perform_restart(struct work_struct *dummy)
172 {
173 orderly_reboot();
174 }
175
176 /*
177 * Perform the shutdown operation in a thread context.
178 */
179 static DECLARE_WORK(shutdown_work, perform_shutdown);
180
181 /*
182 * Perform the restart operation in a thread context.
183 */
184 static DECLARE_WORK(restart_work, perform_restart);
185
shutdown_onchannelcallback(void * context)186 static void shutdown_onchannelcallback(void *context)
187 {
188 struct vmbus_channel *channel = context;
189 struct work_struct *work = NULL;
190 u32 recvlen;
191 u64 requestid;
192 u8 *shut_txf_buf = util_shutdown.recv_buffer;
193
194 struct shutdown_msg_data *shutdown_msg;
195
196 struct icmsg_hdr *icmsghdrp;
197
198 vmbus_recvpacket(channel, shut_txf_buf,
199 HV_HYP_PAGE_SIZE, &recvlen, &requestid);
200
201 if (recvlen > 0) {
202 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
203 sizeof(struct vmbuspipe_hdr)];
204
205 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
206 if (vmbus_prep_negotiate_resp(icmsghdrp, shut_txf_buf,
207 fw_versions, FW_VER_COUNT,
208 sd_versions, SD_VER_COUNT,
209 NULL, &sd_srv_version)) {
210 pr_info("Shutdown IC version %d.%d\n",
211 sd_srv_version >> 16,
212 sd_srv_version & 0xFFFF);
213 }
214 } else {
215 shutdown_msg =
216 (struct shutdown_msg_data *)&shut_txf_buf[
217 sizeof(struct vmbuspipe_hdr) +
218 sizeof(struct icmsg_hdr)];
219
220 /*
221 * shutdown_msg->flags can be 0(shut down), 2(reboot),
222 * or 4(hibernate). It may bitwise-OR 1, which means
223 * performing the request by force. Linux always tries
224 * to perform the request by force.
225 */
226 switch (shutdown_msg->flags) {
227 case 0:
228 case 1:
229 icmsghdrp->status = HV_S_OK;
230 work = &shutdown_work;
231 pr_info("Shutdown request received -"
232 " graceful shutdown initiated\n");
233 break;
234 case 2:
235 case 3:
236 icmsghdrp->status = HV_S_OK;
237 work = &restart_work;
238 pr_info("Restart request received -"
239 " graceful restart initiated\n");
240 break;
241 case 4:
242 case 5:
243 pr_info("Hibernation request received\n");
244 icmsghdrp->status = hibernation_supported ?
245 HV_S_OK : HV_E_FAIL;
246 if (hibernation_supported)
247 work = &hibernate_context.work;
248 break;
249 default:
250 icmsghdrp->status = HV_E_FAIL;
251 pr_info("Shutdown request received -"
252 " Invalid request\n");
253 break;
254 }
255 }
256
257 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
258 | ICMSGHDRFLAG_RESPONSE;
259
260 vmbus_sendpacket(channel, shut_txf_buf,
261 recvlen, requestid,
262 VM_PKT_DATA_INBAND, 0);
263 }
264
265 if (work)
266 schedule_work(work);
267 }
268
269 /*
270 * Set the host time in a process context.
271 */
272 static struct work_struct adj_time_work;
273
274 /*
275 * The last time sample, received from the host. PTP device responds to
276 * requests by using this data and the current partition-wide time reference
277 * count.
278 */
279 static struct {
280 u64 host_time;
281 u64 ref_time;
282 spinlock_t lock;
283 } host_ts;
284
reftime_to_ns(u64 reftime)285 static inline u64 reftime_to_ns(u64 reftime)
286 {
287 return (reftime - WLTIMEDELTA) * 100;
288 }
289
290 /*
291 * Hard coded threshold for host timesync delay: 600 seconds
292 */
293 static const u64 HOST_TIMESYNC_DELAY_THRESH = 600 * (u64)NSEC_PER_SEC;
294
hv_get_adj_host_time(struct timespec64 * ts)295 static int hv_get_adj_host_time(struct timespec64 *ts)
296 {
297 u64 newtime, reftime, timediff_adj;
298 unsigned long flags;
299 int ret = 0;
300
301 spin_lock_irqsave(&host_ts.lock, flags);
302 reftime = hv_read_reference_counter();
303
304 /*
305 * We need to let the caller know that last update from host
306 * is older than the max allowable threshold. clock_gettime()
307 * and PTP ioctl do not have a documented error that we could
308 * return for this specific case. Use ESTALE to report this.
309 */
310 timediff_adj = reftime - host_ts.ref_time;
311 if (timediff_adj * 100 > HOST_TIMESYNC_DELAY_THRESH) {
312 pr_warn_once("TIMESYNC IC: Stale time stamp, %llu nsecs old\n",
313 (timediff_adj * 100));
314 ret = -ESTALE;
315 }
316
317 newtime = host_ts.host_time + timediff_adj;
318 *ts = ns_to_timespec64(reftime_to_ns(newtime));
319 spin_unlock_irqrestore(&host_ts.lock, flags);
320
321 return ret;
322 }
323
hv_set_host_time(struct work_struct * work)324 static void hv_set_host_time(struct work_struct *work)
325 {
326
327 struct timespec64 ts;
328
329 if (!hv_get_adj_host_time(&ts))
330 do_settimeofday64(&ts);
331 }
332
333 /*
334 * Synchronize time with host after reboot, restore, etc.
335 *
336 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
337 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
338 * message after the timesync channel is opened. Since the hv_utils module is
339 * loaded after hv_vmbus, the first message is usually missed. This bit is
340 * considered a hard request to discipline the clock.
341 *
342 * ICTIMESYNCFLAG_SAMPLE bit indicates a time sample from host. This is
343 * typically used as a hint to the guest. The guest is under no obligation
344 * to discipline the clock.
345 */
adj_guesttime(u64 hosttime,u64 reftime,u8 adj_flags)346 static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 adj_flags)
347 {
348 unsigned long flags;
349 u64 cur_reftime;
350
351 /*
352 * Save the adjusted time sample from the host and the snapshot
353 * of the current system time.
354 */
355 spin_lock_irqsave(&host_ts.lock, flags);
356
357 cur_reftime = hv_read_reference_counter();
358 host_ts.host_time = hosttime;
359 host_ts.ref_time = cur_reftime;
360
361 /*
362 * TimeSync v4 messages contain reference time (guest's Hyper-V
363 * clocksource read when the time sample was generated), we can
364 * improve the precision by adding the delta between now and the
365 * time of generation. For older protocols we set
366 * reftime == cur_reftime on call.
367 */
368 host_ts.host_time += (cur_reftime - reftime);
369
370 spin_unlock_irqrestore(&host_ts.lock, flags);
371
372 /* Schedule work to do do_settimeofday64() */
373 if (adj_flags & ICTIMESYNCFLAG_SYNC)
374 schedule_work(&adj_time_work);
375 }
376
377 /*
378 * Time Sync Channel message handler.
379 */
timesync_onchannelcallback(void * context)380 static void timesync_onchannelcallback(void *context)
381 {
382 struct vmbus_channel *channel = context;
383 u32 recvlen;
384 u64 requestid;
385 struct icmsg_hdr *icmsghdrp;
386 struct ictimesync_data *timedatap;
387 struct ictimesync_ref_data *refdata;
388 u8 *time_txf_buf = util_timesynch.recv_buffer;
389
390 /*
391 * Drain the ring buffer and use the last packet to update
392 * host_ts
393 */
394 while (1) {
395 int ret = vmbus_recvpacket(channel, time_txf_buf,
396 HV_HYP_PAGE_SIZE, &recvlen,
397 &requestid);
398 if (ret) {
399 pr_warn_once("TimeSync IC pkt recv failed (Err: %d)\n",
400 ret);
401 break;
402 }
403
404 if (!recvlen)
405 break;
406
407 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
408 sizeof(struct vmbuspipe_hdr)];
409
410 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
411 if (vmbus_prep_negotiate_resp(icmsghdrp, time_txf_buf,
412 fw_versions, FW_VER_COUNT,
413 ts_versions, TS_VER_COUNT,
414 NULL, &ts_srv_version)) {
415 pr_info("TimeSync IC version %d.%d\n",
416 ts_srv_version >> 16,
417 ts_srv_version & 0xFFFF);
418 }
419 } else {
420 if (ts_srv_version > TS_VERSION_3) {
421 refdata = (struct ictimesync_ref_data *)
422 &time_txf_buf[
423 sizeof(struct vmbuspipe_hdr) +
424 sizeof(struct icmsg_hdr)];
425
426 adj_guesttime(refdata->parenttime,
427 refdata->vmreferencetime,
428 refdata->flags);
429 } else {
430 timedatap = (struct ictimesync_data *)
431 &time_txf_buf[
432 sizeof(struct vmbuspipe_hdr) +
433 sizeof(struct icmsg_hdr)];
434 adj_guesttime(timedatap->parenttime,
435 hv_read_reference_counter(),
436 timedatap->flags);
437 }
438 }
439
440 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
441 | ICMSGHDRFLAG_RESPONSE;
442
443 vmbus_sendpacket(channel, time_txf_buf,
444 recvlen, requestid,
445 VM_PKT_DATA_INBAND, 0);
446 }
447 }
448
449 /*
450 * Heartbeat functionality.
451 * Every two seconds, Hyper-V send us a heartbeat request message.
452 * we respond to this message, and Hyper-V knows we are alive.
453 */
heartbeat_onchannelcallback(void * context)454 static void heartbeat_onchannelcallback(void *context)
455 {
456 struct vmbus_channel *channel = context;
457 u32 recvlen;
458 u64 requestid;
459 struct icmsg_hdr *icmsghdrp;
460 struct heartbeat_msg_data *heartbeat_msg;
461 u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
462
463 while (1) {
464
465 vmbus_recvpacket(channel, hbeat_txf_buf,
466 HV_HYP_PAGE_SIZE, &recvlen, &requestid);
467
468 if (!recvlen)
469 break;
470
471 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
472 sizeof(struct vmbuspipe_hdr)];
473
474 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
475 if (vmbus_prep_negotiate_resp(icmsghdrp,
476 hbeat_txf_buf,
477 fw_versions, FW_VER_COUNT,
478 hb_versions, HB_VER_COUNT,
479 NULL, &hb_srv_version)) {
480
481 pr_info("Heartbeat IC version %d.%d\n",
482 hb_srv_version >> 16,
483 hb_srv_version & 0xFFFF);
484 }
485 } else {
486 heartbeat_msg =
487 (struct heartbeat_msg_data *)&hbeat_txf_buf[
488 sizeof(struct vmbuspipe_hdr) +
489 sizeof(struct icmsg_hdr)];
490
491 heartbeat_msg->seq_num += 1;
492 }
493
494 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
495 | ICMSGHDRFLAG_RESPONSE;
496
497 vmbus_sendpacket(channel, hbeat_txf_buf,
498 recvlen, requestid,
499 VM_PKT_DATA_INBAND, 0);
500 }
501 }
502
503 #define HV_UTIL_RING_SEND_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE)
504 #define HV_UTIL_RING_RECV_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE)
505
util_probe(struct hv_device * dev,const struct hv_vmbus_device_id * dev_id)506 static int util_probe(struct hv_device *dev,
507 const struct hv_vmbus_device_id *dev_id)
508 {
509 struct hv_util_service *srv =
510 (struct hv_util_service *)dev_id->driver_data;
511 int ret;
512
513 srv->recv_buffer = kmalloc(HV_HYP_PAGE_SIZE * 4, GFP_KERNEL);
514 if (!srv->recv_buffer)
515 return -ENOMEM;
516 srv->channel = dev->channel;
517 if (srv->util_init) {
518 ret = srv->util_init(srv);
519 if (ret) {
520 ret = -ENODEV;
521 goto error1;
522 }
523 }
524
525 /*
526 * The set of services managed by the util driver are not performance
527 * critical and do not need batched reading. Furthermore, some services
528 * such as KVP can only handle one message from the host at a time.
529 * Turn off batched reading for all util drivers before we open the
530 * channel.
531 */
532 set_channel_read_mode(dev->channel, HV_CALL_DIRECT);
533
534 hv_set_drvdata(dev, srv);
535
536 ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE,
537 HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb,
538 dev->channel);
539 if (ret)
540 goto error;
541
542 return 0;
543
544 error:
545 if (srv->util_deinit)
546 srv->util_deinit();
547 error1:
548 kfree(srv->recv_buffer);
549 return ret;
550 }
551
util_remove(struct hv_device * dev)552 static int util_remove(struct hv_device *dev)
553 {
554 struct hv_util_service *srv = hv_get_drvdata(dev);
555
556 if (srv->util_deinit)
557 srv->util_deinit();
558 vmbus_close(dev->channel);
559 kfree(srv->recv_buffer);
560
561 return 0;
562 }
563
564 /*
565 * When we're in util_suspend(), all the userspace processes have been frozen
566 * (refer to hibernate() -> freeze_processes()). The userspace is thawed only
567 * after the whole resume procedure, including util_resume(), finishes.
568 */
util_suspend(struct hv_device * dev)569 static int util_suspend(struct hv_device *dev)
570 {
571 struct hv_util_service *srv = hv_get_drvdata(dev);
572 int ret = 0;
573
574 if (srv->util_pre_suspend) {
575 ret = srv->util_pre_suspend();
576 if (ret)
577 return ret;
578 }
579
580 vmbus_close(dev->channel);
581
582 return 0;
583 }
584
util_resume(struct hv_device * dev)585 static int util_resume(struct hv_device *dev)
586 {
587 struct hv_util_service *srv = hv_get_drvdata(dev);
588 int ret = 0;
589
590 if (srv->util_pre_resume) {
591 ret = srv->util_pre_resume();
592 if (ret)
593 return ret;
594 }
595
596 ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE,
597 HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb,
598 dev->channel);
599 return ret;
600 }
601
602 static const struct hv_vmbus_device_id id_table[] = {
603 /* Shutdown guid */
604 { HV_SHUTDOWN_GUID,
605 .driver_data = (unsigned long)&util_shutdown
606 },
607 /* Time synch guid */
608 { HV_TS_GUID,
609 .driver_data = (unsigned long)&util_timesynch
610 },
611 /* Heartbeat guid */
612 { HV_HEART_BEAT_GUID,
613 .driver_data = (unsigned long)&util_heartbeat
614 },
615 /* KVP guid */
616 { HV_KVP_GUID,
617 .driver_data = (unsigned long)&util_kvp
618 },
619 /* VSS GUID */
620 { HV_VSS_GUID,
621 .driver_data = (unsigned long)&util_vss
622 },
623 /* File copy GUID */
624 { HV_FCOPY_GUID,
625 .driver_data = (unsigned long)&util_fcopy
626 },
627 { },
628 };
629
630 MODULE_DEVICE_TABLE(vmbus, id_table);
631
632 /* The one and only one */
633 static struct hv_driver util_drv = {
634 .name = "hv_utils",
635 .id_table = id_table,
636 .probe = util_probe,
637 .remove = util_remove,
638 .suspend = util_suspend,
639 .resume = util_resume,
640 .driver = {
641 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
642 },
643 };
644
hv_ptp_enable(struct ptp_clock_info * info,struct ptp_clock_request * request,int on)645 static int hv_ptp_enable(struct ptp_clock_info *info,
646 struct ptp_clock_request *request, int on)
647 {
648 return -EOPNOTSUPP;
649 }
650
hv_ptp_settime(struct ptp_clock_info * p,const struct timespec64 * ts)651 static int hv_ptp_settime(struct ptp_clock_info *p, const struct timespec64 *ts)
652 {
653 return -EOPNOTSUPP;
654 }
655
hv_ptp_adjfreq(struct ptp_clock_info * ptp,s32 delta)656 static int hv_ptp_adjfreq(struct ptp_clock_info *ptp, s32 delta)
657 {
658 return -EOPNOTSUPP;
659 }
hv_ptp_adjtime(struct ptp_clock_info * ptp,s64 delta)660 static int hv_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
661 {
662 return -EOPNOTSUPP;
663 }
664
hv_ptp_gettime(struct ptp_clock_info * info,struct timespec64 * ts)665 static int hv_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts)
666 {
667 return hv_get_adj_host_time(ts);
668 }
669
670 static struct ptp_clock_info ptp_hyperv_info = {
671 .name = "hyperv",
672 .enable = hv_ptp_enable,
673 .adjtime = hv_ptp_adjtime,
674 .adjfreq = hv_ptp_adjfreq,
675 .gettime64 = hv_ptp_gettime,
676 .settime64 = hv_ptp_settime,
677 .owner = THIS_MODULE,
678 };
679
680 static struct ptp_clock *hv_ptp_clock;
681
hv_timesync_init(struct hv_util_service * srv)682 static int hv_timesync_init(struct hv_util_service *srv)
683 {
684 /* TimeSync requires Hyper-V clocksource. */
685 if (!hv_read_reference_counter)
686 return -ENODEV;
687
688 spin_lock_init(&host_ts.lock);
689
690 INIT_WORK(&adj_time_work, hv_set_host_time);
691
692 /*
693 * ptp_clock_register() returns NULL when CONFIG_PTP_1588_CLOCK is
694 * disabled but the driver is still useful without the PTP device
695 * as it still handles the ICTIMESYNCFLAG_SYNC case.
696 */
697 hv_ptp_clock = ptp_clock_register(&ptp_hyperv_info, NULL);
698 if (IS_ERR_OR_NULL(hv_ptp_clock)) {
699 pr_err("cannot register PTP clock: %ld\n",
700 PTR_ERR(hv_ptp_clock));
701 hv_ptp_clock = NULL;
702 }
703
704 return 0;
705 }
706
hv_timesync_cancel_work(void)707 static void hv_timesync_cancel_work(void)
708 {
709 cancel_work_sync(&adj_time_work);
710 }
711
hv_timesync_pre_suspend(void)712 static int hv_timesync_pre_suspend(void)
713 {
714 hv_timesync_cancel_work();
715 return 0;
716 }
717
hv_timesync_deinit(void)718 static void hv_timesync_deinit(void)
719 {
720 if (hv_ptp_clock)
721 ptp_clock_unregister(hv_ptp_clock);
722
723 hv_timesync_cancel_work();
724 }
725
init_hyperv_utils(void)726 static int __init init_hyperv_utils(void)
727 {
728 pr_info("Registering HyperV Utility Driver\n");
729
730 return vmbus_driver_register(&util_drv);
731 }
732
exit_hyperv_utils(void)733 static void exit_hyperv_utils(void)
734 {
735 pr_info("De-Registered HyperV Utility Driver\n");
736
737 vmbus_driver_unregister(&util_drv);
738 }
739
740 module_init(init_hyperv_utils);
741 module_exit(exit_hyperv_utils);
742
743 MODULE_DESCRIPTION("Hyper-V Utilities");
744 MODULE_LICENSE("GPL");
745
