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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2010, Microsoft Corporation.
  *
  * Authors:
  *   Haiyang Zhang <haiyangz@microsoft.com>
  *   Hank Janssen  <hjanssen@microsoft.com>
  */
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/reboot.h>
 #include <linux/hyperv.h>
 #include <linux/clockchips.h>
 #include <linux/ptp_clock_kernel.h>
 #include <asm/mshyperv.h>
 
 #include "hyperv_vmbus.h"
 
 #define SD_MAJOR    3
 #define SD_MINOR    0
 #define SD_MINOR_1  1
 #define SD_MINOR_2  2
 #define SD_VERSION_3_1  (SD_MAJOR << 16 | SD_MINOR_1)
 #define SD_VERSION_3_2  (SD_MAJOR << 16 | SD_MINOR_2)
 #define SD_VERSION  (SD_MAJOR << 16 | SD_MINOR)
 
 #define SD_MAJOR_1  1
 #define SD_VERSION_1    (SD_MAJOR_1 << 16 | SD_MINOR)
 
 #define TS_MAJOR    4
 #define TS_MINOR    0
 #define TS_VERSION  (TS_MAJOR << 16 | TS_MINOR)
 
 #define TS_MAJOR_1  1
 #define TS_VERSION_1    (TS_MAJOR_1 << 16 | TS_MINOR)
 
 #define TS_MAJOR_3  3
 #define TS_VERSION_3    (TS_MAJOR_3 << 16 | TS_MINOR)
 
 #define HB_MAJOR    3
 #define HB_MINOR    0
 #define HB_VERSION  (HB_MAJOR << 16 | HB_MINOR)
 
 #define HB_MAJOR_1  1
 #define HB_VERSION_1    (HB_MAJOR_1 << 16 | HB_MINOR)
 
 static int sd_srv_version;
 static int ts_srv_version;
 static int hb_srv_version;
 
 #define SD_VER_COUNT 4
 static const int sd_versions[] = {
     SD_VERSION_3_2,
     SD_VERSION_3_1,
     SD_VERSION,
     SD_VERSION_1
 };
 
 #define TS_VER_COUNT 3
 static const int ts_versions[] = {
     TS_VERSION,
     TS_VERSION_3,
     TS_VERSION_1
 };
 
 #define HB_VER_COUNT 2
 static const int hb_versions[] = {
     HB_VERSION,
     HB_VERSION_1
 };
 
 #define FW_VER_COUNT 2
 static const int fw_versions[] = {
     UTIL_FW_VERSION,
     UTIL_WS2K8_FW_VERSION
 };
 
 /*
  * Send the "hibernate" udev event in a thread context.
  */
 struct hibernate_work_context {
     struct work_struct work;
     struct hv_device *dev;
 };
 
 static struct hibernate_work_context hibernate_context;
 static bool hibernation_supported;
 
 static void send_hibernate_uevent(struct work_struct *work)
 {
     char *uevent_env[2] = { "EVENT=hibernate", NULL };
     struct hibernate_work_context *ctx;
 
     ctx = container_of(work, struct hibernate_work_context, work);
 
     kobject_uevent_env(&ctx->dev->device.kobj, KOBJ_CHANGE, uevent_env);
 
     pr_info("Sent hibernation uevent\n");
 }
 
 static int hv_shutdown_init(struct hv_util_service *srv)
 {
     struct vmbus_channel *channel = srv->channel;
 
     INIT_WORK(&hibernate_context.work, send_hibernate_uevent);
     hibernate_context.dev = channel->device_obj;
 
     hibernation_supported = hv_is_hibernation_supported();
 
     return 0;
 }
 
 static void shutdown_onchannelcallback(void *context);
 static struct hv_util_service util_shutdown = {
     .util_cb = shutdown_onchannelcallback,
     .util_init = hv_shutdown_init,
 };
 
 static int hv_timesync_init(struct hv_util_service *srv);
 static int hv_timesync_pre_suspend(void);
 static void hv_timesync_deinit(void);
 
 static void timesync_onchannelcallback(void *context);
 static struct hv_util_service util_timesynch = {
     .util_cb = timesync_onchannelcallback,
     .util_init = hv_timesync_init,
     .util_pre_suspend = hv_timesync_pre_suspend,
     .util_deinit = hv_timesync_deinit,
 };
 
 static void heartbeat_onchannelcallback(void *context);
 static struct hv_util_service util_heartbeat = {
     .util_cb = heartbeat_onchannelcallback,
 };
 
 static struct hv_util_service util_kvp = {
     .util_cb = hv_kvp_onchannelcallback,
     .util_init = hv_kvp_init,
     .util_pre_suspend = hv_kvp_pre_suspend,
     .util_pre_resume = hv_kvp_pre_resume,
     .util_deinit = hv_kvp_deinit,
 };
 
 static struct hv_util_service util_vss = {
     .util_cb = hv_vss_onchannelcallback,
     .util_init = hv_vss_init,
     .util_pre_suspend = hv_vss_pre_suspend,
     .util_pre_resume = hv_vss_pre_resume,
     .util_deinit = hv_vss_deinit,
 };
 
 static struct hv_util_service util_fcopy = {
     .util_cb = hv_fcopy_onchannelcallback,
     .util_init = hv_fcopy_init,
     .util_pre_suspend = hv_fcopy_pre_suspend,
     .util_pre_resume = hv_fcopy_pre_resume,
     .util_deinit = hv_fcopy_deinit,
 };
 
 static void perform_shutdown(struct work_struct *dummy)
 {
     orderly_poweroff(true);
 }
 
 static void perform_restart(struct work_struct *dummy)
 {
     orderly_reboot();
 }
 
 /*
  * Perform the shutdown operation in a thread context.
  */
 static DECLARE_WORK(shutdown_work, perform_shutdown);
 
 /*
  * Perform the restart operation in a thread context.
  */
 static DECLARE_WORK(restart_work, perform_restart);
 
 static void shutdown_onchannelcallback(void *context)
 {
     struct vmbus_channel *channel = context;
     struct work_struct *work = NULL;
     u32 recvlen;
     u64 requestid;
     u8  *shut_txf_buf = util_shutdown.recv_buffer;
 
     struct shutdown_msg_data *shutdown_msg;
 
     struct icmsg_hdr *icmsghdrp;
 
     if (vmbus_recvpacket(channel, shut_txf_buf, HV_HYP_PAGE_SIZE, &recvlen, &requestid)) {
         pr_err_ratelimited("Shutdown request received. Could not read into shut txf buf\n");
         return;
     }
 
     if (!recvlen)
         return;
 
     /* Ensure recvlen is big enough to read header data */
     if (recvlen < ICMSG_HDR) {
         pr_err_ratelimited("Shutdown request received. Packet length too small: %d\n",
                    recvlen);
         return;
     }
 
     icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[sizeof(struct vmbuspipe_hdr)];
 
     if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
         if (vmbus_prep_negotiate_resp(icmsghdrp,
                 shut_txf_buf, recvlen,
                 fw_versions, FW_VER_COUNT,
                 sd_versions, SD_VER_COUNT,
                 NULL, &sd_srv_version)) {
             pr_info("Shutdown IC version %d.%d\n",
                 sd_srv_version >> 16,
                 sd_srv_version & 0xFFFF);
         }
     } else if (icmsghdrp->icmsgtype == ICMSGTYPE_SHUTDOWN) {
         /* Ensure recvlen is big enough to contain shutdown_msg_data struct */
         if (recvlen < ICMSG_HDR + sizeof(struct shutdown_msg_data)) {
             pr_err_ratelimited("Invalid shutdown msg data. Packet length too small: %u\n",
                        recvlen);
             return;
         }
 
         shutdown_msg = (struct shutdown_msg_data *)&shut_txf_buf[ICMSG_HDR];
 
         /*
          * shutdown_msg->flags can be 0(shut down), 2(reboot),
          * or 4(hibernate). It may bitwise-OR 1, which means
          * performing the request by force. Linux always tries
          * to perform the request by force.
          */
         switch (shutdown_msg->flags) {
         case 0:
         case 1:
             icmsghdrp->status = HV_S_OK;
             work = &shutdown_work;
             pr_info("Shutdown request received - graceful shutdown initiated\n");
             break;
         case 2:
         case 3:
             icmsghdrp->status = HV_S_OK;
             work = &restart_work;
             pr_info("Restart request received - graceful restart initiated\n");
             break;
         case 4:
         case 5:
             pr_info("Hibernation request received\n");
             icmsghdrp->status = hibernation_supported ?
                 HV_S_OK : HV_E_FAIL;
             if (hibernation_supported)
                 work = &hibernate_context.work;
             break;
         default:
             icmsghdrp->status = HV_E_FAIL;
             pr_info("Shutdown request received - Invalid request\n");
             break;
         }
     } else {
         icmsghdrp->status = HV_E_FAIL;
         pr_err_ratelimited("Shutdown request received. Invalid msg type: %d\n",
                    icmsghdrp->icmsgtype);
     }
 
     icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
         | ICMSGHDRFLAG_RESPONSE;
 
     vmbus_sendpacket(channel, shut_txf_buf,
              recvlen, requestid,
              VM_PKT_DATA_INBAND, 0);
 
     if (work)
         schedule_work(work);
 }
 
 /*
  * Set the host time in a process context.
  */
 static struct work_struct adj_time_work;
 
 /*
  * The last time sample, received from the host. PTP device responds to
  * requests by using this data and the current partition-wide time reference
  * count.
  */
 static struct {
     u64             host_time;
     u64             ref_time;
     spinlock_t          lock;
 } host_ts;
 
 static inline u64 reftime_to_ns(u64 reftime)
 {
     return (reftime - WLTIMEDELTA) * 100;
 }
 
 /*
  * Hard coded threshold for host timesync delay: 600 seconds
  */
 static const u64 HOST_TIMESYNC_DELAY_THRESH = 600 * (u64)NSEC_PER_SEC;
 
 static int hv_get_adj_host_time(struct timespec64 *ts)
 {
     u64 newtime, reftime, timediff_adj;
     unsigned long flags;
     int ret = 0;
 
     spin_lock_irqsave(&host_ts.lock, flags);
     reftime = hv_read_reference_counter();
 
     /*
      * We need to let the caller know that last update from host
      * is older than the max allowable threshold. clock_gettime()
      * and PTP ioctl do not have a documented error that we could
      * return for this specific case. Use ESTALE to report this.
      */
     timediff_adj = reftime - host_ts.ref_time;
     if (timediff_adj * 100 > HOST_TIMESYNC_DELAY_THRESH) {
         pr_warn_once("TIMESYNC IC: Stale time stamp, %llu nsecs old\n",
                  (timediff_adj * 100));
         ret = -ESTALE;
     }
 
     newtime = host_ts.host_time + timediff_adj;
     *ts = ns_to_timespec64(reftime_to_ns(newtime));
     spin_unlock_irqrestore(&host_ts.lock, flags);
 
     return ret;
 }
 
 static void hv_set_host_time(struct work_struct *work)
 {
 
     struct timespec64 ts;
 
     if (!hv_get_adj_host_time(&ts))
         do_settimeofday64(&ts);
 }
 
 /*
  * Synchronize time with host after reboot, restore, etc.
  *
  * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
  * After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
  * message after the timesync channel is opened. Since the hv_utils module is
  * loaded after hv_vmbus, the first message is usually missed. This bit is
  * considered a hard request to discipline the clock.
  *
  * ICTIMESYNCFLAG_SAMPLE bit indicates a time sample from host. This is
  * typically used as a hint to the guest. The guest is under no obligation
  * to discipline the clock.
  */
 static inline void adj_guesttime(u64 hosttime, u64 reftime, u8 adj_flags)
 {
     unsigned long flags;
     u64 cur_reftime;
 
     /*
      * Save the adjusted time sample from the host and the snapshot
      * of the current system time.
      */
     spin_lock_irqsave(&host_ts.lock, flags);
 
     cur_reftime = hv_read_reference_counter();
     host_ts.host_time = hosttime;
     host_ts.ref_time = cur_reftime;
 
     /*
      * TimeSync v4 messages contain reference time (guest's Hyper-V
      * clocksource read when the time sample was generated), we can
      * improve the precision by adding the delta between now and the
      * time of generation. For older protocols we set
      * reftime == cur_reftime on call.
      */
     host_ts.host_time += (cur_reftime - reftime);
 
     spin_unlock_irqrestore(&host_ts.lock, flags);
 
     /* Schedule work to do do_settimeofday64() */
     if (adj_flags & ICTIMESYNCFLAG_SYNC)
         schedule_work(&adj_time_work);
 }
 
 /*
  * Time Sync Channel message handler.
  */
 static void timesync_onchannelcallback(void *context)
 {
     struct vmbus_channel *channel = context;
     u32 recvlen;
     u64 requestid;
     struct icmsg_hdr *icmsghdrp;
     struct ictimesync_data *timedatap;
     struct ictimesync_ref_data *refdata;
     u8 *time_txf_buf = util_timesynch.recv_buffer;
 
     /*
      * Drain the ring buffer and use the last packet to update
      * host_ts
      */
     while (1) {
         int ret = vmbus_recvpacket(channel, time_txf_buf,
                        HV_HYP_PAGE_SIZE, &recvlen,
                        &requestid);
         if (ret) {
             pr_err_ratelimited("TimeSync IC pkt recv failed (Err: %d)\n",
                        ret);
             break;
         }
 
         if (!recvlen)
             break;
 
         /* Ensure recvlen is big enough to read header data */
         if (recvlen < ICMSG_HDR) {
             pr_err_ratelimited("Timesync request received. Packet length too small: %d\n",
                        recvlen);
             break;
         }
 
         icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
                 sizeof(struct vmbuspipe_hdr)];
 
         if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
             if (vmbus_prep_negotiate_resp(icmsghdrp,
                         time_txf_buf, recvlen,
                         fw_versions, FW_VER_COUNT,
                         ts_versions, TS_VER_COUNT,
                         NULL, &ts_srv_version)) {
                 pr_info("TimeSync IC version %d.%d\n",
                     ts_srv_version >> 16,
                     ts_srv_version & 0xFFFF);
             }
         } else if (icmsghdrp->icmsgtype == ICMSGTYPE_TIMESYNC) {
             if (ts_srv_version > TS_VERSION_3) {
                 /* Ensure recvlen is big enough to read ictimesync_ref_data */
                 if (recvlen < ICMSG_HDR + sizeof(struct ictimesync_ref_data)) {
                     pr_err_ratelimited("Invalid ictimesync ref data. Length too small: %u\n",
                                recvlen);
                     break;
                 }
                 refdata = (struct ictimesync_ref_data *)&time_txf_buf[ICMSG_HDR];
 
                 adj_guesttime(refdata->parenttime,
                         refdata->vmreferencetime,
                         refdata->flags);
             } else {
                 /* Ensure recvlen is big enough to read ictimesync_data */
                 if (recvlen < ICMSG_HDR + sizeof(struct ictimesync_data)) {
                     pr_err_ratelimited("Invalid ictimesync data. Length too small: %u\n",
                                recvlen);
                     break;
                 }
                 timedatap = (struct ictimesync_data *)&time_txf_buf[ICMSG_HDR];
 
                 adj_guesttime(timedatap->parenttime,
                           hv_read_reference_counter(),
                           timedatap->flags);
             }
         } else {
             icmsghdrp->status = HV_E_FAIL;
             pr_err_ratelimited("Timesync request received. Invalid msg type: %d\n",
                        icmsghdrp->icmsgtype);
         }
 
         icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
             | ICMSGHDRFLAG_RESPONSE;
 
         vmbus_sendpacket(channel, time_txf_buf,
                  recvlen, requestid,
                  VM_PKT_DATA_INBAND, 0);
     }
 }
 
 /*
  * Heartbeat functionality.
  * Every two seconds, Hyper-V send us a heartbeat request message.
  * we respond to this message, and Hyper-V knows we are alive.
  */
 static void heartbeat_onchannelcallback(void *context)
 {
     struct vmbus_channel *channel = context;
     u32 recvlen;
     u64 requestid;
     struct icmsg_hdr *icmsghdrp;
     struct heartbeat_msg_data *heartbeat_msg;
     u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
 
     while (1) {
 
         if (vmbus_recvpacket(channel, hbeat_txf_buf, HV_HYP_PAGE_SIZE,
                      &recvlen, &requestid)) {
             pr_err_ratelimited("Heartbeat request received. Could not read into hbeat txf buf\n");
             return;
         }
 
         if (!recvlen)
             break;
 
         /* Ensure recvlen is big enough to read header data */
         if (recvlen < ICMSG_HDR) {
             pr_err_ratelimited("Heartbeat request received. Packet length too small: %d\n",
                        recvlen);
             break;
         }
 
         icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
                 sizeof(struct vmbuspipe_hdr)];
 
         if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
             if (vmbus_prep_negotiate_resp(icmsghdrp,
                     hbeat_txf_buf, recvlen,
                     fw_versions, FW_VER_COUNT,
                     hb_versions, HB_VER_COUNT,
                     NULL, &hb_srv_version)) {
 
                 pr_info("Heartbeat IC version %d.%d\n",
                     hb_srv_version >> 16,
                     hb_srv_version & 0xFFFF);
             }
         } else if (icmsghdrp->icmsgtype == ICMSGTYPE_HEARTBEAT) {
             /*
              * Ensure recvlen is big enough to read seq_num. Reserved area is not
              * included in the check as the host may not fill it up entirely
              */
             if (recvlen < ICMSG_HDR + sizeof(u64)) {
                 pr_err_ratelimited("Invalid heartbeat msg data. Length too small: %u\n",
                            recvlen);
                 break;
             }
             heartbeat_msg = (struct heartbeat_msg_data *)&hbeat_txf_buf[ICMSG_HDR];
 
             heartbeat_msg->seq_num += 1;
         } else {
             icmsghdrp->status = HV_E_FAIL;
             pr_err_ratelimited("Heartbeat request received. Invalid msg type: %d\n",
                        icmsghdrp->icmsgtype);
         }
 
         icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
             | ICMSGHDRFLAG_RESPONSE;
 
         vmbus_sendpacket(channel, hbeat_txf_buf,
                  recvlen, requestid,
                  VM_PKT_DATA_INBAND, 0);
     }
 }
 
 #define HV_UTIL_RING_SEND_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE)
 #define HV_UTIL_RING_RECV_SIZE VMBUS_RING_SIZE(3 * HV_HYP_PAGE_SIZE)
 
 static int util_probe(struct hv_device *dev,
             const struct hv_vmbus_device_id *dev_id)
 {
     struct hv_util_service *srv =
         (struct hv_util_service *)dev_id->driver_data;
     int ret;
 
     srv->recv_buffer = kmalloc(HV_HYP_PAGE_SIZE * 4, GFP_KERNEL);
     if (!srv->recv_buffer)
         return -ENOMEM;
     srv->channel = dev->channel;
     if (srv->util_init) {
         ret = srv->util_init(srv);
         if (ret) {
             ret = -ENODEV;
             goto error1;
         }
     }
 
     /*
      * The set of services managed by the util driver are not performance
      * critical and do not need batched reading. Furthermore, some services
      * such as KVP can only handle one message from the host at a time.
      * Turn off batched reading for all util drivers before we open the
      * channel.
      */
     set_channel_read_mode(dev->channel, HV_CALL_DIRECT);
 
     hv_set_drvdata(dev, srv);
 
     ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE,
              HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb,
              dev->channel);
     if (ret)
         goto error;
 
     return 0;
 
 error:
     if (srv->util_deinit)
         srv->util_deinit();
 error1:
     kfree(srv->recv_buffer);
     return ret;
 }
 
 static int util_remove(struct hv_device *dev)
 {
     struct hv_util_service *srv = hv_get_drvdata(dev);
 
     if (srv->util_deinit)
         srv->util_deinit();
     vmbus_close(dev->channel);
     kfree(srv->recv_buffer);
 
     return 0;
 }
 
 /*
  * When we're in util_suspend(), all the userspace processes have been frozen
  * (refer to hibernate() -> freeze_processes()). The userspace is thawed only
  * after the whole resume procedure, including util_resume(), finishes.
  */
 static int util_suspend(struct hv_device *dev)
 {
     struct hv_util_service *srv = hv_get_drvdata(dev);
     int ret = 0;
 
     if (srv->util_pre_suspend) {
         ret = srv->util_pre_suspend();
         if (ret)
             return ret;
     }
 
     vmbus_close(dev->channel);
 
     return 0;
 }
 
 static int util_resume(struct hv_device *dev)
 {
     struct hv_util_service *srv = hv_get_drvdata(dev);
     int ret = 0;
 
     if (srv->util_pre_resume) {
         ret = srv->util_pre_resume();
         if (ret)
             return ret;
     }
 
     ret = vmbus_open(dev->channel, HV_UTIL_RING_SEND_SIZE,
              HV_UTIL_RING_RECV_SIZE, NULL, 0, srv->util_cb,
              dev->channel);
     return ret;
 }
 
 static const struct hv_vmbus_device_id id_table[] = {
     /* Shutdown guid */
     { HV_SHUTDOWN_GUID,
       .driver_data = (unsigned long)&util_shutdown
     },
     /* Time synch guid */
     { HV_TS_GUID,
       .driver_data = (unsigned long)&util_timesynch
     },
     /* Heartbeat guid */
     { HV_HEART_BEAT_GUID,
       .driver_data = (unsigned long)&util_heartbeat
     },
     /* KVP guid */
     { HV_KVP_GUID,
       .driver_data = (unsigned long)&util_kvp
     },
     /* VSS GUID */
     { HV_VSS_GUID,
       .driver_data = (unsigned long)&util_vss
     },
     /* File copy GUID */
     { HV_FCOPY_GUID,
       .driver_data = (unsigned long)&util_fcopy
     },
     { },
 };
 
 MODULE_DEVICE_TABLE(vmbus, id_table);
 
 /* The one and only one */
 static  struct hv_driver util_drv = {
     .name = "hv_utils",
     .id_table = id_table,
     .probe =  util_probe,
     .remove =  util_remove,
     .suspend = util_suspend,
     .resume =  util_resume,
     .driver = {
         .probe_type = PROBE_PREFER_ASYNCHRONOUS,
     },
 };
 
 static int hv_ptp_enable(struct ptp_clock_info *info,
              struct ptp_clock_request *request, int on)
 {
     return -EOPNOTSUPP;
 }
 
 static int hv_ptp_settime(struct ptp_clock_info *p, const struct timespec64 *ts)
 {
     return -EOPNOTSUPP;
 }
 
 static int hv_ptp_adjfreq(struct ptp_clock_info *ptp, s32 delta)
 {
     return -EOPNOTSUPP;
 }
 static int hv_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
 {
     return -EOPNOTSUPP;
 }
 
 static int hv_ptp_gettime(struct ptp_clock_info *info, struct timespec64 *ts)
 {
     return hv_get_adj_host_time(ts);
 }
 
 static struct ptp_clock_info ptp_hyperv_info = {
     .name       = "hyperv",
     .enable         = hv_ptp_enable,
     .adjtime        = hv_ptp_adjtime,
     .adjfreq        = hv_ptp_adjfreq,
     .gettime64      = hv_ptp_gettime,
     .settime64      = hv_ptp_settime,
     .owner      = THIS_MODULE,
 };
 
 static struct ptp_clock *hv_ptp_clock;
 
 static int hv_timesync_init(struct hv_util_service *srv)
 {
     spin_lock_init(&host_ts.lock);
 
     INIT_WORK(&adj_time_work, hv_set_host_time);
 
     /*
      * ptp_clock_register() returns NULL when CONFIG_PTP_1588_CLOCK is
      * disabled but the driver is still useful without the PTP device
      * as it still handles the ICTIMESYNCFLAG_SYNC case.
      */
     hv_ptp_clock = ptp_clock_register(&ptp_hyperv_info, NULL);
     if (IS_ERR_OR_NULL(hv_ptp_clock)) {
         pr_err("cannot register PTP clock: %d\n",
                PTR_ERR_OR_ZERO(hv_ptp_clock));
         hv_ptp_clock = NULL;
     }
 
     return 0;
 }
 
 static void hv_timesync_cancel_work(void)
 {
     cancel_work_sync(&adj_time_work);
 }
 
 static int hv_timesync_pre_suspend(void)
 {
     hv_timesync_cancel_work();
     return 0;
 }
 
 static void hv_timesync_deinit(void)
 {
     if (hv_ptp_clock)
         ptp_clock_unregister(hv_ptp_clock);
 
     hv_timesync_cancel_work();
 }
 
 static int __init init_hyperv_utils(void)
 {
     pr_info("Registering HyperV Utility Driver\n");
 
     return vmbus_driver_register(&util_drv);
 }
 
 static void exit_hyperv_utils(void)
 {
     pr_info("De-Registered HyperV Utility Driver\n");
 
     vmbus_driver_unregister(&util_drv);
 }
 
 module_init(init_hyperv_utils);
 module_exit(exit_hyperv_utils);
 
 MODULE_DESCRIPTION("Hyper-V Utilities");
 MODULE_LICENSE("GPL");

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