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1// SPDX-License-Identifier: GPL-2.0-only2/*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 ": " fmt10 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 <asm/mshyperv.h>21 22#include "hyperv_vmbus.h"23 24#define SD_MAJOR 325#define SD_MINOR 026#define SD_MINOR_1 127#define SD_MINOR_2 228#define SD_VERSION_3_1 (SD_MAJOR << 16 | SD_MINOR_1)29#define SD_VERSION_3_2 (SD_MAJOR << 16 | SD_MINOR_2)30#define SD_VERSION (SD_MAJOR << 16 | SD_MINOR)31 32#define SD_MAJOR_1 133#define SD_VERSION_1 (SD_MAJOR_1 << 16 | SD_MINOR)34 35#define TS_MAJOR 436#define TS_MINOR 037#define TS_VERSION (TS_MAJOR << 16 | TS_MINOR)38 39#define TS_MAJOR_1 140#define TS_VERSION_1 (TS_MAJOR_1 << 16 | TS_MINOR)41 42#define TS_MAJOR_3 343#define TS_VERSION_3 (TS_MAJOR_3 << 16 | TS_MINOR)44 45#define HB_MAJOR 346#define HB_MINOR 047#define HB_VERSION (HB_MAJOR << 16 | HB_MINOR)48 49#define HB_MAJOR_1 150#define HB_VERSION_1 (HB_MAJOR_1 << 16 | HB_MINOR)51 52static int sd_srv_version;53static int ts_srv_version;54static int hb_srv_version;55 56#define SD_VER_COUNT 457static const int sd_versions[] = {58 SD_VERSION_3_2,59 SD_VERSION_3_1,60 SD_VERSION,61 SD_VERSION_162};63 64#define TS_VER_COUNT 365static const int ts_versions[] = {66 TS_VERSION,67 TS_VERSION_3,68 TS_VERSION_169};70 71#define HB_VER_COUNT 272static const int hb_versions[] = {73 HB_VERSION,74 HB_VERSION_175};76 77#define FW_VER_COUNT 278static const int fw_versions[] = {79 UTIL_FW_VERSION,80 UTIL_WS2K8_FW_VERSION81};82 83/*84 * Send the "hibernate" udev event in a thread context.85 */86struct hibernate_work_context {87 struct work_struct work;88 struct hv_device *dev;89};90 91static struct hibernate_work_context hibernate_context;92static bool hibernation_supported;93 94static void send_hibernate_uevent(struct work_struct *work)95{96 char *uevent_env[2] = { "EVENT=hibernate", NULL };97 struct hibernate_work_context *ctx;98 99 ctx = container_of(work, struct hibernate_work_context, work);100 101 kobject_uevent_env(&ctx->dev->device.kobj, KOBJ_CHANGE, uevent_env);102 103 pr_info("Sent hibernation uevent\n");104}105 106static int hv_shutdown_init(struct hv_util_service *srv)107{108 struct vmbus_channel *channel = srv->channel;109 110 INIT_WORK(&hibernate_context.work, send_hibernate_uevent);111 hibernate_context.dev = channel->device_obj;112 113 hibernation_supported = hv_is_hibernation_supported();114 115 return 0;116}117 118static void shutdown_onchannelcallback(void *context);119static struct hv_util_service util_shutdown = {120 .util_cb = shutdown_onchannelcallback,121 .util_init = hv_shutdown_init,122};123 124static int hv_timesync_init(struct hv_util_service *srv);125static int hv_timesync_pre_suspend(void);126static void hv_timesync_deinit(void);127 128static void timesync_onchannelcallback(void *context);129static struct hv_util_service util_timesynch = {130 .util_cb = timesync_onchannelcallback,131 .util_init = hv_timesync_init,132 .util_pre_suspend = hv_timesync_pre_suspend,133 .util_deinit = hv_timesync_deinit,134};135 136static void heartbeat_onchannelcallback(void *context);137static struct hv_util_service util_heartbeat = {138 .util_cb = heartbeat_onchannelcallback,139};140 141static struct hv_util_service util_kvp = {142 .util_cb = hv_kvp_onchannelcallback,143 .util_init = hv_kvp_init,144 .util_pre_suspend = hv_kvp_pre_suspend,145 .util_pre_resume = hv_kvp_pre_resume,146 .util_deinit = hv_kvp_deinit,147};148 149static struct hv_util_service util_vss = {150 .util_cb = hv_vss_onchannelcallback,151 .util_init = hv_vss_init,152 .util_pre_suspend = hv_vss_pre_suspend,153 .util_pre_resume = hv_vss_pre_resume,154 .util_deinit = hv_vss_deinit,155};156 157static void perform_shutdown(struct work_struct *dummy)158{159 orderly_poweroff(true);160}161 162static void perform_restart(struct work_struct *dummy)163{164 orderly_reboot();165}166 167/*168 * Perform the shutdown operation in a thread context.169 */170static DECLARE_WORK(shutdown_work, perform_shutdown);171 172/*173 * Perform the restart operation in a thread context.174 */175static DECLARE_WORK(restart_work, perform_restart);176 177static void shutdown_onchannelcallback(void *context)178{179 struct vmbus_channel *channel = context;180 struct work_struct *work = NULL;181 u32 recvlen;182 u64 requestid;183 u8 *shut_txf_buf = util_shutdown.recv_buffer;184 185 struct shutdown_msg_data *shutdown_msg;186 187 struct icmsg_hdr *icmsghdrp;188 189 if (vmbus_recvpacket(channel, shut_txf_buf, HV_HYP_PAGE_SIZE, &recvlen, &requestid)) {190 pr_err_ratelimited("Shutdown request received. Could not read into shut txf buf\n");191 return;192 }193 194 if (!recvlen)195 return;196 197 /* Ensure recvlen is big enough to read header data */198 if (recvlen < ICMSG_HDR) {199 pr_err_ratelimited("Shutdown request received. Packet length too small: %d\n",200 recvlen);201 return;202 }203 204 icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[sizeof(struct vmbuspipe_hdr)];205 206 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {207 if (vmbus_prep_negotiate_resp(icmsghdrp,208 shut_txf_buf, recvlen,209 fw_versions, FW_VER_COUNT,210 sd_versions, SD_VER_COUNT,211 NULL, &sd_srv_version)) {212 pr_info("Shutdown IC version %d.%d\n",213 sd_srv_version >> 16,214 sd_srv_version & 0xFFFF);215 }216 } else if (icmsghdrp->icmsgtype == ICMSGTYPE_SHUTDOWN) {217 /* Ensure recvlen is big enough to contain shutdown_msg_data struct */218 if (recvlen < ICMSG_HDR + sizeof(struct shutdown_msg_data)) {219 pr_err_ratelimited("Invalid shutdown msg data. Packet length too small: %u\n",220 recvlen);221 return;222 }223 224 shutdown_msg = (struct shutdown_msg_data *)&shut_txf_buf[ICMSG_HDR];225 226 /*227 * shutdown_msg->flags can be 0(shut down), 2(reboot),228 * or 4(hibernate). It may bitwise-OR 1, which means229 * performing the request by force. Linux always tries230 * to perform the request by force.231 */232 switch (shutdown_msg->flags) {233 case 0:234 case 1:235 icmsghdrp->status = HV_S_OK;236 work = &shutdown_work;237 pr_info("Shutdown request received - graceful shutdown initiated\n");238 break;239 case 2:240 case 3:241 icmsghdrp->status = HV_S_OK;242 work = &restart_work;243 pr_info("Restart request received - graceful restart initiated\n");244 break;245 case 4:246 case 5:247 pr_info("Hibernation request received\n");248 icmsghdrp->status = hibernation_supported ?249 HV_S_OK : HV_E_FAIL;250 if (hibernation_supported)251 work = &hibernate_context.work;252 break;253 default:254 icmsghdrp->status = HV_E_FAIL;255 pr_info("Shutdown request received - Invalid request\n");256 break;257 }258 } else {259 icmsghdrp->status = HV_E_FAIL;260 pr_err_ratelimited("Shutdown request received. Invalid msg type: %d\n",261 icmsghdrp->icmsgtype);262 }263 264 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION265 | ICMSGHDRFLAG_RESPONSE;266 267 vmbus_sendpacket(channel, shut_txf_buf,268 recvlen, requestid,269 VM_PKT_DATA_INBAND, 0);270 271 if (work)272 schedule_work(work);273}274 275/*276 * Set the host time in a process context.277 */278static struct work_struct adj_time_work;279 280/*281 * The last time sample, received from the host. PTP device responds to282 * requests by using this data and the current partition-wide time reference283 * count.284 */285static struct {286 u64 host_time;287 u64 ref_time;288 spinlock_t lock;289} host_ts;290 291static bool timesync_implicit;292 293module_param(timesync_implicit, bool, 0644);294MODULE_PARM_DESC(timesync_implicit, "If set treat SAMPLE as SYNC when clock is behind");295 296static inline u64 reftime_to_ns(u64 reftime)297{298 return (reftime - WLTIMEDELTA) * 100;299}300 301/*302 * Hard coded threshold for host timesync delay: 600 seconds303 */304static const u64 HOST_TIMESYNC_DELAY_THRESH = 600 * (u64)NSEC_PER_SEC;305 306static int hv_get_adj_host_time(struct timespec64 *ts)307{308 u64 newtime, reftime, timediff_adj;309 unsigned long flags;310 int ret = 0;311 312 spin_lock_irqsave(&host_ts.lock, flags);313 reftime = hv_read_reference_counter();314 315 /*316 * We need to let the caller know that last update from host317 * is older than the max allowable threshold. clock_gettime()318 * and PTP ioctl do not have a documented error that we could319 * return for this specific case. Use ESTALE to report this.320 */321 timediff_adj = reftime - host_ts.ref_time;322 if (timediff_adj * 100 > HOST_TIMESYNC_DELAY_THRESH) {323 pr_warn_once("TIMESYNC IC: Stale time stamp, %llu nsecs old\n",324 (timediff_adj * 100));325 ret = -ESTALE;326 }327 328 newtime = host_ts.host_time + timediff_adj;329 *ts = ns_to_timespec64(reftime_to_ns(newtime));330 spin_unlock_irqrestore(&host_ts.lock, flags);331 332 return ret;333}334 335static void hv_set_host_time(struct work_struct *work)336{337 338 struct timespec64 ts;339 340 if (!hv_get_adj_host_time(&ts))341 do_settimeofday64(&ts);342}343 344/*345 * Due to a bug on Hyper-V hosts, the sync flag may not always be sent on resume.346 * Force a sync if the guest is behind.347 */348static inline bool hv_implicit_sync(u64 host_time)349{350 struct timespec64 new_ts;351 struct timespec64 threshold_ts;352 353 new_ts = ns_to_timespec64(reftime_to_ns(host_time));354 ktime_get_real_ts64(&threshold_ts);355 356 threshold_ts.tv_sec += 5;357 358 /*359 * If guest behind the host by 5 or more seconds.360 */361 if (timespec64_compare(&new_ts, &threshold_ts) >= 0)362 return true;363 364 return false;365}366 367/*368 * Synchronize time with host after reboot, restore, etc.369 *370 * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.371 * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time372 * message after the timesync channel is opened. Since the hv_utils module is373 * loaded after hv_vmbus, the first message is usually missed. This bit is374 * considered a hard request to discipline the clock.375 *376 * ICTIMESYNCFLAG_SAMPLE bit indicates a time sample from host. This is377 * typically used as a hint to the guest. The guest is under no obligation378 * to discipline the clock.379 */380static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 adj_flags)381{382 unsigned long flags;383 u64 cur_reftime;384 385 /*386 * Save the adjusted time sample from the host and the snapshot387 * of the current system time.388 */389 spin_lock_irqsave(&host_ts.lock, flags);390 391 cur_reftime = hv_read_reference_counter();392 host_ts.host_time = hosttime;393 host_ts.ref_time = cur_reftime;394 395 /*396 * TimeSync v4 messages contain reference time (guest's Hyper-V397 * clocksource read when the time sample was generated), we can398 * improve the precision by adding the delta between now and the399 * time of generation. For older protocols we set400 * reftime == cur_reftime on call.401 */402 host_ts.host_time += (cur_reftime - reftime);403 404 spin_unlock_irqrestore(&host_ts.lock, flags);405 406 /* Schedule work to do do_settimeofday64() */407 if ((adj_flags & ICTIMESYNCFLAG_SYNC) ||408 (timesync_implicit && hv_implicit_sync(host_ts.host_time)))409 schedule_work(&adj_time_work);410}411 412/*413 * Time Sync Channel message handler.414 */415static void timesync_onchannelcallback(void *context)416{417 struct vmbus_channel *channel = context;418 u32 recvlen;419 u64 requestid;420 struct icmsg_hdr *icmsghdrp;421 struct ictimesync_data *timedatap;422 struct ictimesync_ref_data *refdata;423 u8 *time_txf_buf = util_timesynch.recv_buffer;424 425 /*426 * Drain the ring buffer and use the last packet to update427 * host_ts428 */429 while (1) {430 int ret = vmbus_recvpacket(channel, time_txf_buf,431 HV_HYP_PAGE_SIZE, &recvlen,432 &requestid);433 if (ret) {434 pr_err_ratelimited("TimeSync IC pkt recv failed (Err: %d)\n",435 ret);436 break;437 }438 439 if (!recvlen)440 break;441 442 /* Ensure recvlen is big enough to read header data */443 if (recvlen < ICMSG_HDR) {444 pr_err_ratelimited("Timesync request received. Packet length too small: %d\n",445 recvlen);446 break;447 }448 449 icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[450 sizeof(struct vmbuspipe_hdr)];451 452 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {453 if (vmbus_prep_negotiate_resp(icmsghdrp,454 time_txf_buf, recvlen,455 fw_versions, FW_VER_COUNT,456 ts_versions, TS_VER_COUNT,457 NULL, &ts_srv_version)) {458 pr_info("TimeSync IC version %d.%d\n",459 ts_srv_version >> 16,460 ts_srv_version & 0xFFFF);461 }462 } else if (icmsghdrp->icmsgtype == ICMSGTYPE_TIMESYNC) {463 if (ts_srv_version > TS_VERSION_3) {464 /* Ensure recvlen is big enough to read ictimesync_ref_data */465 if (recvlen < ICMSG_HDR + sizeof(struct ictimesync_ref_data)) {466 pr_err_ratelimited("Invalid ictimesync ref data. Length too small: %u\n",467 recvlen);468 break;469 }470 refdata = (struct ictimesync_ref_data *)&time_txf_buf[ICMSG_HDR];471 472 adj_guesttime(refdata->parenttime,473 refdata->vmreferencetime,474 refdata->flags);475 } else {476 /* Ensure recvlen is big enough to read ictimesync_data */477 if (recvlen < ICMSG_HDR + sizeof(struct ictimesync_data)) {478 pr_err_ratelimited("Invalid ictimesync data. Length too small: %u\n",479 recvlen);480 break;481 }482 timedatap = (struct ictimesync_data *)&time_txf_buf[ICMSG_HDR];483 484 adj_guesttime(timedatap->parenttime,485 hv_read_reference_counter(),486 timedatap->flags);487 }488 } else {489 icmsghdrp->status = HV_E_FAIL;490 pr_err_ratelimited("Timesync request received. Invalid msg type: %d\n",491 icmsghdrp->icmsgtype);492 }493 494 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION495 | ICMSGHDRFLAG_RESPONSE;496 497 vmbus_sendpacket(channel, time_txf_buf,498 recvlen, requestid,499 VM_PKT_DATA_INBAND, 0);500 }501}502 503/*504 * Heartbeat functionality.505 * Every two seconds, Hyper-V send us a heartbeat request message.506 * we respond to this message, and Hyper-V knows we are alive.507 */508static void heartbeat_onchannelcallback(void *context)509{510 struct vmbus_channel *channel = context;511 u32 recvlen;512 u64 requestid;513 struct icmsg_hdr *icmsghdrp;514 struct heartbeat_msg_data *heartbeat_msg;515 u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;516 517 while (1) {518 519 if (vmbus_recvpacket(channel, hbeat_txf_buf, HV_HYP_PAGE_SIZE,520 &recvlen, &requestid)) {521 pr_err_ratelimited("Heartbeat request received. Could not read into hbeat txf buf\n");522 return;523 }524 525 if (!recvlen)526 break;527 528 /* Ensure recvlen is big enough to read header data */529 if (recvlen < ICMSG_HDR) {530 pr_err_ratelimited("Heartbeat request received. Packet length too small: %d\n",531 recvlen);532 break;533 }534 535 icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[536 sizeof(struct vmbuspipe_hdr)];537 538 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {539 if (vmbus_prep_negotiate_resp(icmsghdrp,540 hbeat_txf_buf, recvlen,541 fw_versions, FW_VER_COUNT,542 hb_versions, HB_VER_COUNT,543 NULL, &hb_srv_version)) {544 545 pr_info("Heartbeat IC version %d.%d\n",546 hb_srv_version >> 16,547 hb_srv_version & 0xFFFF);548 }549 } else if (icmsghdrp->icmsgtype == ICMSGTYPE_HEARTBEAT) {550 /*551 * Ensure recvlen is big enough to read seq_num. Reserved area is not552 * included in the check as the host may not fill it up entirely553 */554 if (recvlen < ICMSG_HDR + sizeof(u64)) {555 pr_err_ratelimited("Invalid heartbeat msg data. Length too small: %u\n",556 recvlen);557 break;558 }559 heartbeat_msg = (struct heartbeat_msg_data *)&hbeat_txf_buf[ICMSG_HDR];560 561 heartbeat_msg->seq_num += 1;562 } else {563 icmsghdrp->status = HV_E_FAIL;564 pr_err_ratelimited("Heartbeat request received. Invalid msg type: %d\n",565 icmsghdrp->icmsgtype);566 }567 568 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION569 | ICMSGHDRFLAG_RESPONSE;570 571 vmbus_sendpacket(channel, hbeat_txf_buf,572 recvlen, requestid,573 VM_PKT_DATA_INBAND, 0);574 }575}576 577#define HV_UTIL_RING_SEND_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE)578#define HV_UTIL_RING_RECV_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE)579 580static int util_probe(struct hv_device *dev,581 const struct hv_vmbus_device_id *dev_id)582{583 struct hv_util_service *srv =584 (struct hv_util_service *)dev_id->driver_data;585 int ret;586 587 srv->recv_buffer = kmalloc(HV_HYP_PAGE_SIZE * 4, GFP_KERNEL);588 if (!srv->recv_buffer)589 return -ENOMEM;590 srv->channel = dev->channel;591 if (srv->util_init) {592 ret = srv->util_init(srv);593 if (ret) {594 ret = -ENODEV;595 goto error1;596 }597 }598 599 /*600 * The set of services managed by the util driver are not performance601 * critical and do not need batched reading. Furthermore, some services602 * such as KVP can only handle one message from the host at a time.603 * Turn off batched reading for all util drivers before we open the604 * channel.605 */606 set_channel_read_mode(dev->channel, HV_CALL_DIRECT);607 608 hv_set_drvdata(dev, srv);609 610 ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE,611 HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb,612 dev->channel);613 if (ret)614 goto error;615 616 return 0;617 618error:619 if (srv->util_deinit)620 srv->util_deinit();621error1:622 kfree(srv->recv_buffer);623 return ret;624}625 626static void util_remove(struct hv_device *dev)627{628 struct hv_util_service *srv = hv_get_drvdata(dev);629 630 if (srv->util_deinit)631 srv->util_deinit();632 vmbus_close(dev->channel);633 kfree(srv->recv_buffer);634}635 636/*637 * When we're in util_suspend(), all the userspace processes have been frozen638 * (refer to hibernate() -> freeze_processes()). The userspace is thawed only639 * after the whole resume procedure, including util_resume(), finishes.640 */641static int util_suspend(struct hv_device *dev)642{643 struct hv_util_service *srv = hv_get_drvdata(dev);644 int ret = 0;645 646 if (srv->util_pre_suspend) {647 ret = srv->util_pre_suspend();648 if (ret)649 return ret;650 }651 652 vmbus_close(dev->channel);653 654 return 0;655}656 657static int util_resume(struct hv_device *dev)658{659 struct hv_util_service *srv = hv_get_drvdata(dev);660 int ret = 0;661 662 if (srv->util_pre_resume) {663 ret = srv->util_pre_resume();664 if (ret)665 return ret;666 }667 668 ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE,669 HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb,670 dev->channel);671 return ret;672}673 674static const struct hv_vmbus_device_id id_table[] = {675 /* Shutdown guid */676 { HV_SHUTDOWN_GUID,677 .driver_data = (unsigned long)&util_shutdown678 },679 /* Time synch guid */680 { HV_TS_GUID,681 .driver_data = (unsigned long)&util_timesynch682 },683 /* Heartbeat guid */684 { HV_HEART_BEAT_GUID,685 .driver_data = (unsigned long)&util_heartbeat686 },687 /* KVP guid */688 { HV_KVP_GUID,689 .driver_data = (unsigned long)&util_kvp690 },691 /* VSS GUID */692 { HV_VSS_GUID,693 .driver_data = (unsigned long)&util_vss694 },695 { },696};697 698MODULE_DEVICE_TABLE(vmbus, id_table);699 700/* The one and only one */701static struct hv_driver util_drv = {702 .name = "hv_utils",703 .id_table = id_table,704 .probe = util_probe,705 .remove = util_remove,706 .suspend = util_suspend,707 .resume = util_resume,708 .driver = {709 .probe_type = PROBE_PREFER_ASYNCHRONOUS,710 },711};712 713static int hv_ptp_enable(struct ptp_clock_info *info,714 struct ptp_clock_request *request, int on)715{716 return -EOPNOTSUPP;717}718 719static int hv_ptp_settime(struct ptp_clock_info *p, const struct timespec64 *ts)720{721 return -EOPNOTSUPP;722}723 724static int hv_ptp_adjfine(struct ptp_clock_info *ptp, long delta)725{726 return -EOPNOTSUPP;727}728static int hv_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)729{730 return -EOPNOTSUPP;731}732 733static int hv_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts)734{735 return hv_get_adj_host_time(ts);736}737 738static struct ptp_clock_info ptp_hyperv_info = {739 .name = "hyperv",740 .enable = hv_ptp_enable,741 .adjtime = hv_ptp_adjtime,742 .adjfine = hv_ptp_adjfine,743 .gettime64 = hv_ptp_gettime,744 .settime64 = hv_ptp_settime,745 .owner = THIS_MODULE,746};747 748static struct ptp_clock *hv_ptp_clock;749 750static int hv_timesync_init(struct hv_util_service *srv)751{752 spin_lock_init(&host_ts.lock);753 754 INIT_WORK(&adj_time_work, hv_set_host_time);755 756 /*757 * ptp_clock_register() returns NULL when CONFIG_PTP_1588_CLOCK is758 * disabled but the driver is still useful without the PTP device759 * as it still handles the ICTIMESYNCFLAG_SYNC case.760 */761 hv_ptp_clock = ptp_clock_register(&ptp_hyperv_info, NULL);762 if (IS_ERR_OR_NULL(hv_ptp_clock)) {763 pr_err("cannot register PTP clock: %d\n",764 PTR_ERR_OR_ZERO(hv_ptp_clock));765 hv_ptp_clock = NULL;766 }767 768 return 0;769}770 771static void hv_timesync_cancel_work(void)772{773 cancel_work_sync(&adj_time_work);774}775 776static int hv_timesync_pre_suspend(void)777{778 hv_timesync_cancel_work();779 return 0;780}781 782static void hv_timesync_deinit(void)783{784 if (hv_ptp_clock)785 ptp_clock_unregister(hv_ptp_clock);786 787 hv_timesync_cancel_work();788}789 790static int __init init_hyperv_utils(void)791{792 pr_info("Registering HyperV Utility Driver\n");793 794 return vmbus_driver_register(&util_drv);795}796 797static void exit_hyperv_utils(void)798{799 pr_info("De-Registered HyperV Utility Driver\n");800 801 vmbus_driver_unregister(&util_drv);802}803 804module_init(init_hyperv_utils);805module_exit(exit_hyperv_utils);806 807MODULE_DESCRIPTION("Hyper-V Utilities");808MODULE_LICENSE("GPL");809