[linux-2.6-block.git] / drivers / hv / hv_util.c

/*
 * Copyright (c) 2010, Microsoft Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA 02111-1307 USA.
 *
 * 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>

static void shutdown_onchannelcallback(void *context);
static struct hv_util_service util_shutdown = {
	.util_cb = shutdown_onchannelcallback,
};

static void timesync_onchannelcallback(void *context);
static struct hv_util_service util_timesynch = {
	.util_cb = timesync_onchannelcallback,
};

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_deinit = hv_kvp_deinit,
};

static void shutdown_onchannelcallback(void *context)
{
	struct vmbus_channel *channel = context;
	u32 recvlen;
	u64 requestid;
	u8  execute_shutdown = false;
	u8  *shut_txf_buf = util_shutdown.recv_buffer;

	struct shutdown_msg_data *shutdown_msg;

	struct icmsg_hdr *icmsghdrp;
	struct icmsg_negotiate *negop = NULL;

	vmbus_recvpacket(channel, shut_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
			sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			vmbus_prep_negotiate_resp(icmsghdrp, negop,
					shut_txf_buf, MAX_SRV_VER, MAX_SRV_VER);
		} else {
			shutdown_msg =
				(struct shutdown_msg_data *)&shut_txf_buf[
					sizeof(struct vmbuspipe_hdr) +
					sizeof(struct icmsg_hdr)];

			switch (shutdown_msg->flags) {
			case 0:
			case 1:
				icmsghdrp->status = HV_S_OK;
				execute_shutdown = true;

				pr_info("Shutdown request received -"
					    " graceful shutdown initiated\n");
				break;
			default:
				icmsghdrp->status = HV_E_FAIL;
				execute_shutdown = false;

				pr_info("Shutdown request received -"
					    " Invalid request\n");
				break;
			}
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		vmbus_sendpacket(channel, shut_txf_buf,
				       recvlen, requestid,
				       VM_PKT_DATA_INBAND, 0);
	}

	if (execute_shutdown == true)
		orderly_poweroff(true);
}

/*
 * Set guest time to host UTC time.
 */
static inline void do_adj_guesttime(u64 hosttime)
{
	s64 host_tns;
	struct timespec host_ts;

	host_tns = (hosttime - WLTIMEDELTA) * 100;
	host_ts = ns_to_timespec(host_tns);

	do_settimeofday(&host_ts);
}

/*
 * Set the host time in a process context.
 */

struct adj_time_work {
	struct work_struct work;
	u64	host_time;
};

static void hv_set_host_time(struct work_struct *work)
{
	struct adj_time_work	*wrk;

	wrk = container_of(work, struct adj_time_work, work);
	do_adj_guesttime(wrk->host_time);
	kfree(wrk);
}

/*
 * 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. The other
 * thing is, systime is automatically set to emulated hardware clock which may
 * not be UTC time or in the same time zone. So, to override these effects, we
 * use the first 50 time samples for initial system time setting.
 */
static inline void adj_guesttime(u64 hosttime, u8 flags)
{
	struct adj_time_work    *wrk;
	static s32 scnt = 50;

	wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
	if (wrk == NULL)
		return;

	wrk->host_time = hosttime;
	if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
		INIT_WORK(&wrk->work, hv_set_host_time);
		schedule_work(&wrk->work);
		return;
	}

	if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
		scnt--;
		INIT_WORK(&wrk->work, hv_set_host_time);
		schedule_work(&wrk->work);
	} else
		kfree(wrk);
}

/*
 * 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;
	u8 *time_txf_buf = util_timesynch.recv_buffer;

	vmbus_recvpacket(channel, time_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
				sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			vmbus_prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf,
						MAX_SRV_VER, MAX_SRV_VER);
		} else {
			timedatap = (struct ictimesync_data *)&time_txf_buf[
				sizeof(struct vmbuspipe_hdr) +
				sizeof(struct icmsg_hdr)];
			adj_guesttime(timedatap->parenttime, timedatap->flags);
		}

		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;

	vmbus_recvpacket(channel, hbeat_txf_buf,
			 PAGE_SIZE, &recvlen, &requestid);

	if (recvlen > 0) {
		icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
				sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			vmbus_prep_negotiate_resp(icmsghdrp, NULL,
				hbeat_txf_buf, MAX_SRV_VER, MAX_SRV_VER);
		} else {
			heartbeat_msg =
				(struct heartbeat_msg_data *)&hbeat_txf_buf[
					sizeof(struct vmbuspipe_hdr) +
					sizeof(struct icmsg_hdr)];

			heartbeat_msg->seq_num += 1;
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		vmbus_sendpacket(channel, hbeat_txf_buf,
				       recvlen, requestid,
				       VM_PKT_DATA_INBAND, 0);
	}
}

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(PAGE_SIZE, GFP_KERNEL);
	if (!srv->recv_buffer)
		return -ENOMEM;
	if (srv->util_init) {
		ret = srv->util_init(srv);
		if (ret) {
			ret = -ENODEV;
			goto error1;
		}
	}

	ret = vmbus_open(dev->channel, 2 * PAGE_SIZE, 2 * PAGE_SIZE, NULL, 0,
			srv->util_cb, dev->channel);
	if (ret)
		goto error;

	hv_set_drvdata(dev, srv);
	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);

	vmbus_close(dev->channel);
	if (srv->util_deinit)
		srv->util_deinit();
	kfree(srv->recv_buffer);

	return 0;
}

static const struct hv_vmbus_device_id id_table[] = {
	/* Shutdown guid */
	{ VMBUS_DEVICE(0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
		       0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB)
	  .driver_data = (unsigned long)&util_shutdown },
	/* Time synch guid */
	{ VMBUS_DEVICE(0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
		       0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
	  .driver_data = (unsigned long)&util_timesynch },
	/* Heartbeat guid */
	{ VMBUS_DEVICE(0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
		       0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
	  .driver_data = (unsigned long)&util_heartbeat },
	/* KVP guid */
	{ VMBUS_DEVICE(0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
		       0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3,  0xe6)
	  .driver_data = (unsigned long)&util_kvp },
	{ },
};

MODULE_DEVICE_TABLE(vmbus, id_table);

/* The one and only one */
static  struct hv_driver util_drv = {
	.name = "hv_util",
	.id_table = id_table,
	.probe =  util_probe,
	.remove =  util_remove,
};

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_VERSION(HV_DRV_VERSION);
MODULE_LICENSE("GPL");
Commit	Line	Data
c88c4e4c HJ	1	/*
	2	* Copyright (c) 2010, Microsoft Corporation.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	15	* Place - Suite 330, Boston, MA 02111-1307 USA.
	16	*
	17	* Authors:
	18	* Haiyang Zhang <haiyangz@microsoft.com>
	19	* Hank Janssen <hjanssen@microsoft.com>
	20	*/
af7a5b6e HJ	21	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
af7a5b6e HJ	22
c88c4e4c HJ	23	#include <linux/kernel.h>
	24	#include <linux/init.h>
	25	#include <linux/module.h>
	26	#include <linux/slab.h>
	27	#include <linux/sysctl.h>
9e629075	28	#include <linux/reboot.h>
46a97191	29	#include <linux/hyperv.h>
c88c4e4c	30
a29b643c S	31	static void shutdown_onchannelcallback(void *context);
	32	static struct hv_util_service util_shutdown = {
	33	.util_cb = shutdown_onchannelcallback,
	34	};
	35
	36	static void timesync_onchannelcallback(void *context);
	37	static struct hv_util_service util_timesynch = {
	38	.util_cb = timesync_onchannelcallback,
	39	};
	40
	41	static void heartbeat_onchannelcallback(void *context);
	42	static struct hv_util_service util_heartbeat = {
	43	.util_cb = heartbeat_onchannelcallback,
	44	};
	45
	46	static struct hv_util_service util_kvp = {
	47	.util_cb = hv_kvp_onchannelcallback,
	48	.util_init = hv_kvp_init,
	49	.util_deinit = hv_kvp_deinit,
	50	};
c88c4e4c	51
6610944a	52	static void shutdown_onchannelcallback(void *context)
c88c4e4c HJ	53	{
c88c4e4c HJ	54	struct vmbus_channel *channel = context;
45241e50	55	u32 recvlen;
c88c4e4c HJ	56	u64 requestid;
c88c4e4c HJ	57	u8 execute_shutdown = false;
a29b643c	58	u8 *shut_txf_buf = util_shutdown.recv_buffer;
c88c4e4c HJ	59
	60	struct shutdown_msg_data *shutdown_msg;
	61
	62	struct icmsg_hdr *icmsghdrp;
	63	struct icmsg_negotiate *negop = NULL;
	64
45241e50 HJ	65	vmbus_recvpacket(channel, shut_txf_buf,
45241e50 HJ	66	PAGE_SIZE, &recvlen, &requestid);
c88c4e4c HJ	67
c88c4e4c HJ	68	if (recvlen > 0) {
45241e50	69	icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
c88c4e4c HJ	70	sizeof(struct vmbuspipe_hdr)];
	71
	72	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab S	73	vmbus_prep_negotiate_resp(icmsghdrp, negop,
c836d0ab S	74	shut_txf_buf, MAX_SRV_VER, MAX_SRV_VER);
c88c4e4c	75	} else {
45241e50 HJ	76	shutdown_msg =
	77	(struct shutdown_msg_data *)&shut_txf_buf[
	78	sizeof(struct vmbuspipe_hdr) +
	79	sizeof(struct icmsg_hdr)];
c88c4e4c HJ	80
	81	switch (shutdown_msg->flags) {
	82	case 0:
	83	case 1:
	84	icmsghdrp->status = HV_S_OK;
	85	execute_shutdown = true;
	86
af7a5b6e	87	pr_info("Shutdown request received -"
32235b07	88	" graceful shutdown initiated\n");
c88c4e4c HJ	89	break;
	90	default:
	91	icmsghdrp->status = HV_E_FAIL;
	92	execute_shutdown = false;
	93
af7a5b6e HJ	94	pr_info("Shutdown request received -"
af7a5b6e HJ	95	" Invalid request\n");
c88c4e4c	96	break;
95cd17c9	97	}
c88c4e4c HJ	98	}
	99
	100	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	101	\| ICMSGHDRFLAG_RESPONSE;
	102
45241e50	103	vmbus_sendpacket(channel, shut_txf_buf,
c88c4e4c	104	recvlen, requestid,
415f2287	105	VM_PKT_DATA_INBAND, 0);
c88c4e4c HJ	106	}
c88c4e4c HJ	107
c88c4e4c	108	if (execute_shutdown == true)
ae2a0b42	109	orderly_poweroff(true);
c88c4e4c HJ	110	}
c88c4e4c HJ	111
39c4e9c3	112	/*
e9ec3603	113	* Set guest time to host UTC time.
39c4e9c3	114	*/
e9ec3603	115	static inline void do_adj_guesttime(u64 hosttime)
39c4e9c3 HZ	116	{
	117	s64 host_tns;
	118	struct timespec host_ts;
39c4e9c3 HZ	119
	120	host_tns = (hosttime - WLTIMEDELTA) * 100;
	121	host_ts = ns_to_timespec(host_tns);
	122
e9ec3603 HZ	123	do_settimeofday(&host_ts);
	124	}
	125
95ff7cde S	126	/*
	127	* Set the host time in a process context.
	128	*/
	129
	130	struct adj_time_work {
	131	struct work_struct work;
	132	u64 host_time;
	133	};
	134
	135	static void hv_set_host_time(struct work_struct *work)
	136	{
	137	struct adj_time_work *wrk;
	138
	139	wrk = container_of(work, struct adj_time_work, work);
	140	do_adj_guesttime(wrk->host_time);
	141	kfree(wrk);
	142	}
	143
e9ec3603 HZ	144	/*
	145	* Synchronize time with host after reboot, restore, etc.
	146	*
	147	* ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
	148	* After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
	149	* message after the timesync channel is opened. Since the hv_utils module is
	150	* loaded after hv_vmbus, the first message is usually missed. The other
	151	* thing is, systime is automatically set to emulated hardware clock which may
	152	* not be UTC time or in the same time zone. So, to override these effects, we
	153	* use the first 50 time samples for initial system time setting.
	154	*/
	155	static inline void adj_guesttime(u64 hosttime, u8 flags)
	156	{
95ff7cde	157	struct adj_time_work *wrk;
e9ec3603 HZ	158	static s32 scnt = 50;
e9ec3603 HZ	159
95ff7cde S	160	wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
	161	if (wrk == NULL)
	162	return;
	163
	164	wrk->host_time = hosttime;
39c4e9c3	165	if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
95ff7cde S	166	INIT_WORK(&wrk->work, hv_set_host_time);
95ff7cde S	167	schedule_work(&wrk->work);
39c4e9c3 HZ	168	return;
	169	}
	170
e9ec3603	171	if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
39c4e9c3	172	scnt--;
95ff7cde S	173	INIT_WORK(&wrk->work, hv_set_host_time);
	174	schedule_work(&wrk->work);
	175	} else
	176	kfree(wrk);
39c4e9c3 HZ	177	}
	178
	179	/*
	180	* Time Sync Channel message handler.
	181	*/
	182	static void timesync_onchannelcallback(void *context)
	183	{
	184	struct vmbus_channel *channel = context;
45241e50	185	u32 recvlen;
39c4e9c3 HZ	186	u64 requestid;
	187	struct icmsg_hdr *icmsghdrp;
	188	struct ictimesync_data *timedatap;
a29b643c	189	u8 *time_txf_buf = util_timesynch.recv_buffer;
39c4e9c3	190
45241e50 HJ	191	vmbus_recvpacket(channel, time_txf_buf,
45241e50 HJ	192	PAGE_SIZE, &recvlen, &requestid);
39c4e9c3 HZ	193
39c4e9c3 HZ	194	if (recvlen > 0) {
45241e50	195	icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
39c4e9c3 HZ	196	sizeof(struct vmbuspipe_hdr)];
	197
	198	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab S	199	vmbus_prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf,
c836d0ab S	200	MAX_SRV_VER, MAX_SRV_VER);
39c4e9c3	201	} else {
45241e50	202	timedatap = (struct ictimesync_data *)&time_txf_buf[
39c4e9c3 HZ	203	sizeof(struct vmbuspipe_hdr) +
	204	sizeof(struct icmsg_hdr)];
	205	adj_guesttime(timedatap->parenttime, timedatap->flags);
	206	}
	207
	208	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	209	\| ICMSGHDRFLAG_RESPONSE;
	210
45241e50	211	vmbus_sendpacket(channel, time_txf_buf,
39c4e9c3	212	recvlen, requestid,
415f2287	213	VM_PKT_DATA_INBAND, 0);
39c4e9c3	214	}
39c4e9c3 HZ	215	}
39c4e9c3 HZ	216
9153f7b9 HJ	217	/*
	218	* Heartbeat functionality.
	219	* Every two seconds, Hyper-V send us a heartbeat request message.
	220	* we respond to this message, and Hyper-V knows we are alive.
	221	*/
	222	static void heartbeat_onchannelcallback(void *context)
	223	{
	224	struct vmbus_channel *channel = context;
45241e50	225	u32 recvlen;
9153f7b9 HJ	226	u64 requestid;
	227	struct icmsg_hdr *icmsghdrp;
	228	struct heartbeat_msg_data *heartbeat_msg;
a29b643c	229	u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
9153f7b9	230
45241e50 HJ	231	vmbus_recvpacket(channel, hbeat_txf_buf,
45241e50 HJ	232	PAGE_SIZE, &recvlen, &requestid);
9153f7b9 HJ	233
9153f7b9 HJ	234	if (recvlen > 0) {
45241e50	235	icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
9153f7b9 HJ	236	sizeof(struct vmbuspipe_hdr)];
	237
	238	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab S	239	vmbus_prep_negotiate_resp(icmsghdrp, NULL,
c836d0ab S	240	hbeat_txf_buf, MAX_SRV_VER, MAX_SRV_VER);
9153f7b9	241	} else {
45241e50 HJ	242	heartbeat_msg =
	243	(struct heartbeat_msg_data *)&hbeat_txf_buf[
	244	sizeof(struct vmbuspipe_hdr) +
	245	sizeof(struct icmsg_hdr)];
9153f7b9	246
9153f7b9 HJ	247	heartbeat_msg->seq_num += 1;
	248	}
	249
	250	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	251	\| ICMSGHDRFLAG_RESPONSE;
	252
45241e50	253	vmbus_sendpacket(channel, hbeat_txf_buf,
9153f7b9	254	recvlen, requestid,
415f2287	255	VM_PKT_DATA_INBAND, 0);
9153f7b9	256	}
9153f7b9	257	}
39c4e9c3	258
84946899 S	259	static int util_probe(struct hv_device *dev,
84946899 S	260	const struct hv_vmbus_device_id *dev_id)
283f2129	261	{
a29b643c S	262	struct hv_util_service *srv =
	263	(struct hv_util_service *)dev_id->driver_data;
	264	int ret;
	265
	266	srv->recv_buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
	267	if (!srv->recv_buffer)
	268	return -ENOMEM;
	269	if (srv->util_init) {
	270	ret = srv->util_init(srv);
	271	if (ret) {
4e65f6e8 S	272	ret = -ENODEV;
4e65f6e8 S	273	goto error1;
a29b643c S	274	}
	275	}
	276
4e65f6e8 S	277	ret = vmbus_open(dev->channel, 2 * PAGE_SIZE, 2 * PAGE_SIZE, NULL, 0,
	278	srv->util_cb, dev->channel);
	279	if (ret)
	280	goto error;
	281
a29b643c	282	hv_set_drvdata(dev, srv);
283f2129	283	return 0;
4e65f6e8 S	284
	285	error:
	286	if (srv->util_deinit)
	287	srv->util_deinit();
	288	error1:
	289	kfree(srv->recv_buffer);
	290	return ret;
283f2129 S	291	}
	292
	293	static int util_remove(struct hv_device *dev)
	294	{
a29b643c S	295	struct hv_util_service *srv = hv_get_drvdata(dev);
a29b643c S	296
4e65f6e8	297	vmbus_close(dev->channel);
a29b643c S	298	if (srv->util_deinit)
	299	srv->util_deinit();
	300	kfree(srv->recv_buffer);
	301
283f2129 S	302	return 0;
	303	}
	304
	305	static const struct hv_vmbus_device_id id_table[] = {
c45cf2d4 GKH	306	/* Shutdown guid */
c45cf2d4 GKH	307	{ VMBUS_DEVICE(0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
a29b643c S	308	0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB)
a29b643c S	309	.driver_data = (unsigned long)&util_shutdown },
c45cf2d4 GKH	310	/* Time synch guid */
c45cf2d4 GKH	311	{ VMBUS_DEVICE(0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
a29b643c S	312	0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
a29b643c S	313	.driver_data = (unsigned long)&util_timesynch },
c45cf2d4 GKH	314	/* Heartbeat guid */
c45cf2d4 GKH	315	{ VMBUS_DEVICE(0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
a29b643c S	316	0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
a29b643c S	317	.driver_data = (unsigned long)&util_heartbeat },
c45cf2d4 GKH	318	/* KVP guid */
c45cf2d4 GKH	319	{ VMBUS_DEVICE(0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
a29b643c S	320	0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6)
a29b643c S	321	.driver_data = (unsigned long)&util_kvp },
c45cf2d4	322	{ },
283f2129 S	323	};
	324
	325	MODULE_DEVICE_TABLE(vmbus, id_table);
	326
	327	/* The one and only one */
	328	static struct hv_driver util_drv = {
768fa219	329	.name = "hv_util",
283f2129 S	330	.id_table = id_table,
	331	.probe = util_probe,
	332	.remove = util_remove,
	333	};
	334
c88c4e4c HJ	335	static int __init init_hyperv_utils(void)
c88c4e4c HJ	336	{
af7a5b6e	337	pr_info("Registering HyperV Utility Driver\n");
c88c4e4c	338
4e65f6e8	339	return vmbus_driver_register(&util_drv);
c88c4e4c HJ	340	}
	341
	342	static void exit_hyperv_utils(void)
	343	{
af7a5b6e	344	pr_info("De-Registered HyperV Utility Driver\n");
c88c4e4c	345
768fa219	346	vmbus_driver_unregister(&util_drv);
c88c4e4c HJ	347	}
	348
	349	module_init(init_hyperv_utils);
	350	module_exit(exit_hyperv_utils);
	351
	352	MODULE_DESCRIPTION("Hyper-V Utilities");
	353	MODULE_VERSION(HV_DRV_VERSION);
	354	MODULE_LICENSE("GPL");