From 39c4e9c37894feb1525fac4bb75e8c919042473b Mon Sep 17 00:00:00 2001 From: Haiyang Zhang Date: Wed, 5 May 2010 19:23:46 +0000 Subject: [PATCH] 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: Hank Janssen Signed-off-by: Haiyang Zhang Signed-off-by: Greg Kroah-Hartman --- drivers/staging/hv/ChannelMgmt.c | 24 ++++++++++- drivers/staging/hv/hyperv_utils.c | 84 +++++++++++++++++++++++++++++++++++++++ drivers/staging/hv/utils.h | 25 +++++++++++- 3 files changed, 130 insertions(+), 3 deletions(-) diff --git a/drivers/staging/hv/ChannelMgmt.c b/drivers/staging/hv/ChannelMgmt.c index 05e6699e3c78..369823013889 100644 --- a/drivers/staging/hv/ChannelMgmt.c +++ b/drivers/staging/hv/ChannelMgmt.c @@ -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); diff --git a/drivers/staging/hv/hyperv_utils.c b/drivers/staging/hv/hyperv_utils.c index cbebad3e40a0..9174f79a7d36 100644 --- a/drivers/staging/hv/hyperv_utils.c +++ b/drivers/staging/hv/hyperv_utils.c @@ -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 = + ×ync_onchannelcallback; + hv_cb_utils[HV_TIMESYNC_MSG].callback = ×ync_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); diff --git a/drivers/staging/hv/utils.h b/drivers/staging/hv/utils.h index e404b21e9af2..d1d2f282dd9b 100644 --- a/drivers/staging/hv/utils.h +++ b/drivers/staging/hv/utils.h @@ -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; -- 2.11.0