[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 struct hv_util_service util_vss = {
	.util_cb = hv_vss_onchannelcallback,
	.util_init = hv_vss_init,
	.util_deinit = hv_vss_deinit,
};

static void perform_shutdown(struct work_struct *dummy)
{
	orderly_poweroff(true);
}

/*
 * Perform the shutdown operation in a thread context.
 */
static DECLARE_WORK(shutdown_work, perform_shutdown);

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)
		schedule_work(&shutdown_work);
}

/*
 * 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 * 2, GFP_KERNEL);
	if (!srv->recv_buffer)
		return -ENOMEM;
	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_state(dev->channel, false);

	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * 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 */
	{ 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
	},
	{ },
};

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
96dd86fa S	52	static struct hv_util_service util_vss = {
	53	.util_cb = hv_vss_onchannelcallback,
	54	.util_init = hv_vss_init,
	55	.util_deinit = hv_vss_deinit,
	56	};
	57
3dd6cb49 S	58	static void perform_shutdown(struct work_struct *dummy)
	59	{
	60	orderly_poweroff(true);
	61	}
	62
	63	/*
	64	* Perform the shutdown operation in a thread context.
	65	*/
	66	static DECLARE_WORK(shutdown_work, perform_shutdown);
	67
6610944a	68	static void shutdown_onchannelcallback(void *context)
c88c4e4c HJ	69	{
c88c4e4c HJ	70	struct vmbus_channel *channel = context;
45241e50	71	u32 recvlen;
c88c4e4c HJ	72	u64 requestid;
c88c4e4c HJ	73	u8 execute_shutdown = false;
a29b643c	74	u8 *shut_txf_buf = util_shutdown.recv_buffer;
c88c4e4c HJ	75
	76	struct shutdown_msg_data *shutdown_msg;
	77
	78	struct icmsg_hdr *icmsghdrp;
	79	struct icmsg_negotiate *negop = NULL;
	80
45241e50 HJ	81	vmbus_recvpacket(channel, shut_txf_buf,
45241e50 HJ	82	PAGE_SIZE, &recvlen, &requestid);
c88c4e4c HJ	83
c88c4e4c HJ	84	if (recvlen > 0) {
45241e50	85	icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
c88c4e4c HJ	86	sizeof(struct vmbuspipe_hdr)];
	87
	88	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab S	89	vmbus_prep_negotiate_resp(icmsghdrp, negop,
c836d0ab S	90	shut_txf_buf, MAX_SRV_VER, MAX_SRV_VER);
c88c4e4c	91	} else {
45241e50 HJ	92	shutdown_msg =
	93	(struct shutdown_msg_data *)&shut_txf_buf[
	94	sizeof(struct vmbuspipe_hdr) +
	95	sizeof(struct icmsg_hdr)];
c88c4e4c HJ	96
	97	switch (shutdown_msg->flags) {
	98	case 0:
	99	case 1:
	100	icmsghdrp->status = HV_S_OK;
	101	execute_shutdown = true;
	102
af7a5b6e	103	pr_info("Shutdown request received -"
32235b07	104	" graceful shutdown initiated\n");
c88c4e4c HJ	105	break;
	106	default:
	107	icmsghdrp->status = HV_E_FAIL;
	108	execute_shutdown = false;
	109
af7a5b6e HJ	110	pr_info("Shutdown request received -"
af7a5b6e HJ	111	" Invalid request\n");
c88c4e4c	112	break;
95cd17c9	113	}
c88c4e4c HJ	114	}
	115
	116	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	117	\| ICMSGHDRFLAG_RESPONSE;
	118
45241e50	119	vmbus_sendpacket(channel, shut_txf_buf,
c88c4e4c	120	recvlen, requestid,
415f2287	121	VM_PKT_DATA_INBAND, 0);
c88c4e4c HJ	122	}
c88c4e4c HJ	123
c88c4e4c	124	if (execute_shutdown == true)
3dd6cb49	125	schedule_work(&shutdown_work);
c88c4e4c HJ	126	}
c88c4e4c HJ	127
39c4e9c3	128	/*
e9ec3603	129	* Set guest time to host UTC time.
39c4e9c3	130	*/
e9ec3603	131	static inline void do_adj_guesttime(u64 hosttime)
39c4e9c3 HZ	132	{
	133	s64 host_tns;
	134	struct timespec host_ts;
39c4e9c3 HZ	135
	136	host_tns = (hosttime - WLTIMEDELTA) * 100;
	137	host_ts = ns_to_timespec(host_tns);
	138
e9ec3603 HZ	139	do_settimeofday(&host_ts);
	140	}
	141
95ff7cde S	142	/*
	143	* Set the host time in a process context.
	144	*/
	145
	146	struct adj_time_work {
	147	struct work_struct work;
	148	u64 host_time;
	149	};
	150
	151	static void hv_set_host_time(struct work_struct *work)
	152	{
	153	struct adj_time_work *wrk;
	154
	155	wrk = container_of(work, struct adj_time_work, work);
	156	do_adj_guesttime(wrk->host_time);
	157	kfree(wrk);
	158	}
	159
e9ec3603 HZ	160	/*
	161	* Synchronize time with host after reboot, restore, etc.
	162	*
	163	* ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
	164	* After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
	165	* message after the timesync channel is opened. Since the hv_utils module is
	166	* loaded after hv_vmbus, the first message is usually missed. The other
	167	* thing is, systime is automatically set to emulated hardware clock which may
	168	* not be UTC time or in the same time zone. So, to override these effects, we
	169	* use the first 50 time samples for initial system time setting.
	170	*/
	171	static inline void adj_guesttime(u64 hosttime, u8 flags)
	172	{
95ff7cde	173	struct adj_time_work *wrk;
e9ec3603 HZ	174	static s32 scnt = 50;
e9ec3603 HZ	175
95ff7cde S	176	wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
	177	if (wrk == NULL)
	178	return;
	179
	180	wrk->host_time = hosttime;
39c4e9c3	181	if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
95ff7cde S	182	INIT_WORK(&wrk->work, hv_set_host_time);
95ff7cde S	183	schedule_work(&wrk->work);
39c4e9c3 HZ	184	return;
	185	}
	186
e9ec3603	187	if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
39c4e9c3	188	scnt--;
95ff7cde S	189	INIT_WORK(&wrk->work, hv_set_host_time);
	190	schedule_work(&wrk->work);
	191	} else
	192	kfree(wrk);
39c4e9c3 HZ	193	}
	194
	195	/*
	196	* Time Sync Channel message handler.
	197	*/
	198	static void timesync_onchannelcallback(void *context)
	199	{
	200	struct vmbus_channel *channel = context;
45241e50	201	u32 recvlen;
39c4e9c3 HZ	202	u64 requestid;
	203	struct icmsg_hdr *icmsghdrp;
	204	struct ictimesync_data *timedatap;
a29b643c	205	u8 *time_txf_buf = util_timesynch.recv_buffer;
39c4e9c3	206
45241e50 HJ	207	vmbus_recvpacket(channel, time_txf_buf,
45241e50 HJ	208	PAGE_SIZE, &recvlen, &requestid);
39c4e9c3 HZ	209
39c4e9c3 HZ	210	if (recvlen > 0) {
45241e50	211	icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
39c4e9c3 HZ	212	sizeof(struct vmbuspipe_hdr)];
	213
	214	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab S	215	vmbus_prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf,
c836d0ab S	216	MAX_SRV_VER, MAX_SRV_VER);
39c4e9c3	217	} else {
45241e50	218	timedatap = (struct ictimesync_data *)&time_txf_buf[
39c4e9c3 HZ	219	sizeof(struct vmbuspipe_hdr) +
	220	sizeof(struct icmsg_hdr)];
	221	adj_guesttime(timedatap->parenttime, timedatap->flags);
	222	}
	223
	224	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	225	\| ICMSGHDRFLAG_RESPONSE;
	226
45241e50	227	vmbus_sendpacket(channel, time_txf_buf,
39c4e9c3	228	recvlen, requestid,
415f2287	229	VM_PKT_DATA_INBAND, 0);
39c4e9c3	230	}
39c4e9c3 HZ	231	}
39c4e9c3 HZ	232
9153f7b9 HJ	233	/*
	234	* Heartbeat functionality.
	235	* Every two seconds, Hyper-V send us a heartbeat request message.
	236	* we respond to this message, and Hyper-V knows we are alive.
	237	*/
	238	static void heartbeat_onchannelcallback(void *context)
	239	{
	240	struct vmbus_channel *channel = context;
45241e50	241	u32 recvlen;
9153f7b9 HJ	242	u64 requestid;
	243	struct icmsg_hdr *icmsghdrp;
	244	struct heartbeat_msg_data *heartbeat_msg;
a29b643c	245	u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
9153f7b9	246
45241e50 HJ	247	vmbus_recvpacket(channel, hbeat_txf_buf,
45241e50 HJ	248	PAGE_SIZE, &recvlen, &requestid);
9153f7b9 HJ	249
9153f7b9 HJ	250	if (recvlen > 0) {
45241e50	251	icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
9153f7b9 HJ	252	sizeof(struct vmbuspipe_hdr)];
	253
	254	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab S	255	vmbus_prep_negotiate_resp(icmsghdrp, NULL,
c836d0ab S	256	hbeat_txf_buf, MAX_SRV_VER, MAX_SRV_VER);
9153f7b9	257	} else {
45241e50 HJ	258	heartbeat_msg =
	259	(struct heartbeat_msg_data *)&hbeat_txf_buf[
	260	sizeof(struct vmbuspipe_hdr) +
	261	sizeof(struct icmsg_hdr)];
9153f7b9	262
9153f7b9 HJ	263	heartbeat_msg->seq_num += 1;
	264	}
	265
	266	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	267	\| ICMSGHDRFLAG_RESPONSE;
	268
45241e50	269	vmbus_sendpacket(channel, hbeat_txf_buf,
9153f7b9	270	recvlen, requestid,
415f2287	271	VM_PKT_DATA_INBAND, 0);
9153f7b9	272	}
9153f7b9	273	}
39c4e9c3	274
84946899 S	275	static int util_probe(struct hv_device *dev,
84946899 S	276	const struct hv_vmbus_device_id *dev_id)
283f2129	277	{
a29b643c S	278	struct hv_util_service *srv =
	279	(struct hv_util_service *)dev_id->driver_data;
	280	int ret;
	281
9b595780	282	srv->recv_buffer = kmalloc(PAGE_SIZE * 2, GFP_KERNEL);
a29b643c S	283	if (!srv->recv_buffer)
	284	return -ENOMEM;
	285	if (srv->util_init) {
	286	ret = srv->util_init(srv);
	287	if (ret) {
4e65f6e8 S	288	ret = -ENODEV;
4e65f6e8 S	289	goto error1;
a29b643c S	290	}
	291	}
	292
7ae3e035 S	293	/*
	294	* The set of services managed by the util driver are not performance
	295	* critical and do not need batched reading. Furthermore, some services
	296	* such as KVP can only handle one message from the host at a time.
	297	* Turn off batched reading for all util drivers before we open the
	298	* channel.
	299	*/
	300
	301	set_channel_read_state(dev->channel, false);
	302
9b595780	303	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
4e65f6e8 S	304	srv->util_cb, dev->channel);
	305	if (ret)
	306	goto error;
	307
a29b643c	308	hv_set_drvdata(dev, srv);
283f2129	309	return 0;
4e65f6e8 S	310
	311	error:
	312	if (srv->util_deinit)
	313	srv->util_deinit();
	314	error1:
	315	kfree(srv->recv_buffer);
	316	return ret;
283f2129 S	317	}
	318
	319	static int util_remove(struct hv_device *dev)
	320	{
a29b643c S	321	struct hv_util_service *srv = hv_get_drvdata(dev);
a29b643c S	322
4e65f6e8	323	vmbus_close(dev->channel);
a29b643c S	324	if (srv->util_deinit)
	325	srv->util_deinit();
	326	kfree(srv->recv_buffer);
	327
283f2129 S	328	return 0;
	329	}
	330
	331	static const struct hv_vmbus_device_id id_table[] = {
c45cf2d4	332	/* Shutdown guid */
d13984e5 S	333	{ HV_SHUTDOWN_GUID,
	334	.driver_data = (unsigned long)&util_shutdown
	335	},
c45cf2d4	336	/* Time synch guid */
d13984e5 S	337	{ HV_TS_GUID,
	338	.driver_data = (unsigned long)&util_timesynch
	339	},
c45cf2d4	340	/* Heartbeat guid */
d13984e5 S	341	{ HV_HEART_BEAT_GUID,
	342	.driver_data = (unsigned long)&util_heartbeat
	343	},
c45cf2d4	344	/* KVP guid */
d13984e5 S	345	{ HV_KVP_GUID,
	346	.driver_data = (unsigned long)&util_kvp
	347	},
96dd86fa S	348	/* VSS GUID */
	349	{ HV_VSS_GUID,
	350	.driver_data = (unsigned long)&util_vss
	351	},
c45cf2d4	352	{ },
283f2129 S	353	};
	354
	355	MODULE_DEVICE_TABLE(vmbus, id_table);
	356
	357	/* The one and only one */
	358	static struct hv_driver util_drv = {
768fa219	359	.name = "hv_util",
283f2129 S	360	.id_table = id_table,
	361	.probe = util_probe,
	362	.remove = util_remove,
	363	};
	364
c88c4e4c HJ	365	static int __init init_hyperv_utils(void)
c88c4e4c HJ	366	{
af7a5b6e	367	pr_info("Registering HyperV Utility Driver\n");
c88c4e4c	368
4e65f6e8	369	return vmbus_driver_register(&util_drv);
c88c4e4c HJ	370	}
	371
	372	static void exit_hyperv_utils(void)
	373	{
af7a5b6e	374	pr_info("De-Registered HyperV Utility Driver\n");
c88c4e4c	375
768fa219	376	vmbus_driver_unregister(&util_drv);
c88c4e4c HJ	377	}
	378
	379	module_init(init_hyperv_utils);
	380	module_exit(exit_hyperv_utils);
	381
	382	MODULE_DESCRIPTION("Hyper-V Utilities");
	383	MODULE_VERSION(HV_DRV_VERSION);
	384	MODULE_LICENSE("GPL");