Commit 39c4e9c3 authored by Haiyang Zhang's avatar Haiyang Zhang Committed by Greg Kroah-Hartman

Staging: hv: Add Time Sync feature to hv_utils module.

The Time Sync feature synchronizes guest time to host UTC time after reboot,
and restore from saved/paused state.
Signed-off-by: default avatarHank Janssen <hjanssen@microsoft.com>
Signed-off-by: default avatarHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent e61fbe66
......@@ -33,8 +33,8 @@ struct vmbus_channel_message_table_entry {
void (*messageHandler)(struct vmbus_channel_message_header *msg);
};
#define MAX_MSG_TYPES 1
#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 5
#define MAX_MSG_TYPES 2
#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 6
static const struct hv_guid
gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
......@@ -81,6 +81,14 @@ static const struct hv_guid
0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
}
},
/* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
/* TimeSync */
{
.data = {
0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
}
},
};
......@@ -191,6 +199,18 @@ struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
.callback = chn_cb_negotiate,
.log_msg = "Shutdown channel functionality initialized"
},
/* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
/* TimeSync */
{
.msg_type = HV_TIMESYNC_MSG,
.data = {
0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
},
.callback = chn_cb_negotiate,
.log_msg = "Timesync channel functionality initialized"
},
};
EXPORT_SYMBOL(hv_cb_utils);
......
......@@ -106,6 +106,82 @@ static void shutdown_onchannelcallback(void *context)
orderly_poweroff(false);
}
/*
* Synchronize time with host after reboot, restore, etc.
*/
static void adj_guesttime(winfiletime_t hosttime, u8 flags)
{
s64 host_tns;
struct timespec host_ts;
static s32 scnt = 50;
host_tns = (hosttime - WLTIMEDELTA) * 100;
host_ts = ns_to_timespec(host_tns);
if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
do_settimeofday(&host_ts);
return;
}
if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 &&
scnt > 0) {
scnt--;
do_settimeofday(&host_ts);
}
return;
}
/*
* Time Sync Channel message handler.
*/
static void timesync_onchannelcallback(void *context)
{
struct vmbus_channel *channel = context;
u8 *buf;
u32 buflen, recvlen;
u64 requestid;
struct icmsg_hdr *icmsghdrp;
struct ictimesync_data *timedatap;
DPRINT_ENTER(VMBUS);
buflen = PAGE_SIZE;
buf = kmalloc(buflen, GFP_ATOMIC);
VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
if (recvlen > 0) {
DPRINT_DBG(VMBUS, "timesync packet: recvlen=%d, requestid=%lld",
recvlen, requestid);
icmsghdrp = (struct icmsg_hdr *)&buf[
sizeof(struct vmbuspipe_hdr)];
if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
prep_negotiate_resp(icmsghdrp, NULL, buf);
} else {
timedatap = (struct ictimesync_data *)&buf[
sizeof(struct vmbuspipe_hdr) +
sizeof(struct icmsg_hdr)];
adj_guesttime(timedatap->parenttime, timedatap->flags);
}
icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
| ICMSGHDRFLAG_RESPONSE;
VmbusChannelSendPacket(channel, buf,
recvlen, requestid,
VmbusPacketTypeDataInBand, 0);
}
kfree(buf);
DPRINT_EXIT(VMBUS);
}
static int __init init_hyperv_utils(void)
{
printk(KERN_INFO "Registering HyperV Utility Driver\n");
......@@ -114,6 +190,10 @@ static int __init init_hyperv_utils(void)
&shutdown_onchannelcallback;
hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
hv_cb_utils[HV_TIMESYNC_MSG].channel->OnChannelCallback =
&timesync_onchannelcallback;
hv_cb_utils[HV_TIMESYNC_MSG].callback = &timesync_onchannelcallback;
return 0;
}
......@@ -124,6 +204,10 @@ static void exit_hyperv_utils(void)
hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
&chn_cb_negotiate;
hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
hv_cb_utils[HV_TIMESYNC_MSG].channel->OnChannelCallback =
&chn_cb_negotiate;
hv_cb_utils[HV_TIMESYNC_MSG].callback = &chn_cb_negotiate;
}
module_init(init_hyperv_utils);
......
......@@ -75,7 +75,30 @@ struct shutdown_msg_data {
u8 display_message[2048];
} __attribute__((packed));
#define HV_SHUTDOWN_MSG 0
/* Time Sync IC defs */
#define ICTIMESYNCFLAG_PROBE 0
#define ICTIMESYNCFLAG_SYNC 1
#define ICTIMESYNCFLAG_SAMPLE 2
#ifdef __x86_64__
#define WLTIMEDELTA 116444736000000000L /* in 100ns unit */
#else
#define WLTIMEDELTA 116444736000000000LL
#endif
typedef u64 winfiletime_t; /* Windows FILETIME type */
struct ictimesync_data{
winfiletime_t parenttime;
winfiletime_t childtime;
winfiletime_t roundtriptime;
u8 flags;
} __attribute__((packed));
/* Index for each IC struct in array hv_cb_utils[] */
#define HV_SHUTDOWN_MSG 0
#define HV_TIMESYNC_MSG 1
struct hyperv_service_callback {
u8 msg_type;
......
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