[deliverable/linux.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>

#define SHUTDOWN_MAJOR	3
#define SHUTDOWN_MINOR  0
#define SHUTDOWN_MAJOR_MINOR	(SHUTDOWN_MAJOR << 16 | SHUTDOWN_MINOR)

#define TIMESYNCH_MAJOR	3
#define TIMESYNCH_MINOR 0
#define TIMESYNCH_MAJOR_MINOR	(TIMESYNCH_MAJOR << 16 | TIMESYNCH_MINOR)

#define HEARTBEAT_MAJOR	3
#define HEARTBEAT_MINOR 0
#define HEARTBEAT_MAJOR_MINOR	(HEARTBEAT_MAJOR << 16 | HEARTBEAT_MINOR)

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, UTIL_FW_MAJOR_MINOR,
					SHUTDOWN_MAJOR_MINOR);
		} 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,
						UTIL_FW_MAJOR_MINOR,
						TIMESYNCH_MAJOR_MINOR);
		} 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, UTIL_FW_MAJOR_MINOR,
				HEARTBEAT_MAJOR_MINOR);
		} 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_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
6741335b S	31	#define SHUTDOWN_MAJOR 3
	32	#define SHUTDOWN_MINOR 0
	33	#define SHUTDOWN_MAJOR_MINOR (SHUTDOWN_MAJOR << 16 \| SHUTDOWN_MINOR)
	34
	35	#define TIMESYNCH_MAJOR 3
	36	#define TIMESYNCH_MINOR 0
	37	#define TIMESYNCH_MAJOR_MINOR (TIMESYNCH_MAJOR << 16 \| TIMESYNCH_MINOR)
	38
	39	#define HEARTBEAT_MAJOR 3
	40	#define HEARTBEAT_MINOR 0
	41	#define HEARTBEAT_MAJOR_MINOR (HEARTBEAT_MAJOR << 16 \| HEARTBEAT_MINOR)
	42
a29b643c S	43	static void shutdown_onchannelcallback(void *context);
	44	static struct hv_util_service util_shutdown = {
	45	.util_cb = shutdown_onchannelcallback,
	46	};
	47
	48	static void timesync_onchannelcallback(void *context);
	49	static struct hv_util_service util_timesynch = {
	50	.util_cb = timesync_onchannelcallback,
	51	};
	52
	53	static void heartbeat_onchannelcallback(void *context);
	54	static struct hv_util_service util_heartbeat = {
	55	.util_cb = heartbeat_onchannelcallback,
	56	};
	57
	58	static struct hv_util_service util_kvp = {
	59	.util_cb = hv_kvp_onchannelcallback,
	60	.util_init = hv_kvp_init,
	61	.util_deinit = hv_kvp_deinit,
	62	};
c88c4e4c	63
96dd86fa S	64	static struct hv_util_service util_vss = {
	65	.util_cb = hv_vss_onchannelcallback,
	66	.util_init = hv_vss_init,
	67	.util_deinit = hv_vss_deinit,
	68	};
	69
3dd6cb49 S	70	static void perform_shutdown(struct work_struct *dummy)
	71	{
	72	orderly_poweroff(true);
	73	}
	74
	75	/*
	76	* Perform the shutdown operation in a thread context.
	77	*/
	78	static DECLARE_WORK(shutdown_work, perform_shutdown);
	79
6610944a	80	static void shutdown_onchannelcallback(void *context)
c88c4e4c HJ	81	{
c88c4e4c HJ	82	struct vmbus_channel *channel = context;
45241e50	83	u32 recvlen;
c88c4e4c HJ	84	u64 requestid;
c88c4e4c HJ	85	u8 execute_shutdown = false;
a29b643c	86	u8 *shut_txf_buf = util_shutdown.recv_buffer;
c88c4e4c HJ	87
	88	struct shutdown_msg_data *shutdown_msg;
	89
	90	struct icmsg_hdr *icmsghdrp;
	91	struct icmsg_negotiate *negop = NULL;
	92
45241e50 HJ	93	vmbus_recvpacket(channel, shut_txf_buf,
45241e50 HJ	94	PAGE_SIZE, &recvlen, &requestid);
c88c4e4c HJ	95
c88c4e4c HJ	96	if (recvlen > 0) {
45241e50	97	icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
c88c4e4c HJ	98	sizeof(struct vmbuspipe_hdr)];
	99
	100	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab	101	vmbus_prep_negotiate_resp(icmsghdrp, negop,
6741335b S	102	shut_txf_buf, UTIL_FW_MAJOR_MINOR,
6741335b S	103	SHUTDOWN_MAJOR_MINOR);
c88c4e4c	104	} else {
45241e50 HJ	105	shutdown_msg =
	106	(struct shutdown_msg_data *)&shut_txf_buf[
	107	sizeof(struct vmbuspipe_hdr) +
	108	sizeof(struct icmsg_hdr)];
c88c4e4c HJ	109
	110	switch (shutdown_msg->flags) {
	111	case 0:
	112	case 1:
	113	icmsghdrp->status = HV_S_OK;
	114	execute_shutdown = true;
	115
af7a5b6e	116	pr_info("Shutdown request received -"
32235b07	117	" graceful shutdown initiated\n");
c88c4e4c HJ	118	break;
	119	default:
	120	icmsghdrp->status = HV_E_FAIL;
	121	execute_shutdown = false;
	122
af7a5b6e HJ	123	pr_info("Shutdown request received -"
af7a5b6e HJ	124	" Invalid request\n");
c88c4e4c	125	break;
95cd17c9	126	}
c88c4e4c HJ	127	}
	128
	129	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	130	\| ICMSGHDRFLAG_RESPONSE;
	131
45241e50	132	vmbus_sendpacket(channel, shut_txf_buf,
c88c4e4c	133	recvlen, requestid,
415f2287	134	VM_PKT_DATA_INBAND, 0);
c88c4e4c HJ	135	}
c88c4e4c HJ	136
c88c4e4c	137	if (execute_shutdown == true)
3dd6cb49	138	schedule_work(&shutdown_work);
c88c4e4c HJ	139	}
c88c4e4c HJ	140
39c4e9c3	141	/*
e9ec3603	142	* Set guest time to host UTC time.
39c4e9c3	143	*/
e9ec3603	144	static inline void do_adj_guesttime(u64 hosttime)
39c4e9c3 HZ	145	{
	146	s64 host_tns;
	147	struct timespec host_ts;
39c4e9c3 HZ	148
	149	host_tns = (hosttime - WLTIMEDELTA) * 100;
	150	host_ts = ns_to_timespec(host_tns);
	151
e9ec3603 HZ	152	do_settimeofday(&host_ts);
	153	}
	154
95ff7cde S	155	/*
	156	* Set the host time in a process context.
	157	*/
	158
	159	struct adj_time_work {
	160	struct work_struct work;
	161	u64 host_time;
	162	};
	163
	164	static void hv_set_host_time(struct work_struct *work)
	165	{
	166	struct adj_time_work *wrk;
	167
	168	wrk = container_of(work, struct adj_time_work, work);
	169	do_adj_guesttime(wrk->host_time);
	170	kfree(wrk);
	171	}
	172
e9ec3603 HZ	173	/*
	174	* Synchronize time with host after reboot, restore, etc.
	175	*
	176	* ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
	177	* After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
	178	* message after the timesync channel is opened. Since the hv_utils module is
	179	* loaded after hv_vmbus, the first message is usually missed. The other
	180	* thing is, systime is automatically set to emulated hardware clock which may
	181	* not be UTC time or in the same time zone. So, to override these effects, we
	182	* use the first 50 time samples for initial system time setting.
	183	*/
	184	static inline void adj_guesttime(u64 hosttime, u8 flags)
	185	{
95ff7cde	186	struct adj_time_work *wrk;
e9ec3603 HZ	187	static s32 scnt = 50;
e9ec3603 HZ	188
95ff7cde S	189	wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
	190	if (wrk == NULL)
	191	return;
	192
	193	wrk->host_time = hosttime;
39c4e9c3	194	if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
95ff7cde S	195	INIT_WORK(&wrk->work, hv_set_host_time);
95ff7cde S	196	schedule_work(&wrk->work);
39c4e9c3 HZ	197	return;
	198	}
	199
e9ec3603	200	if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
39c4e9c3	201	scnt--;
95ff7cde S	202	INIT_WORK(&wrk->work, hv_set_host_time);
	203	schedule_work(&wrk->work);
	204	} else
	205	kfree(wrk);
39c4e9c3 HZ	206	}
	207
	208	/*
	209	* Time Sync Channel message handler.
	210	*/
	211	static void timesync_onchannelcallback(void *context)
	212	{
	213	struct vmbus_channel *channel = context;
45241e50	214	u32 recvlen;
39c4e9c3 HZ	215	u64 requestid;
	216	struct icmsg_hdr *icmsghdrp;
	217	struct ictimesync_data *timedatap;
a29b643c	218	u8 *time_txf_buf = util_timesynch.recv_buffer;
39c4e9c3	219
45241e50 HJ	220	vmbus_recvpacket(channel, time_txf_buf,
45241e50 HJ	221	PAGE_SIZE, &recvlen, &requestid);
39c4e9c3 HZ	222
39c4e9c3 HZ	223	if (recvlen > 0) {
45241e50	224	icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
39c4e9c3 HZ	225	sizeof(struct vmbuspipe_hdr)];
	226
	227	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab	228	vmbus_prep_negotiate_resp(icmsghdrp, NULL, time_txf_buf,
6741335b S	229	UTIL_FW_MAJOR_MINOR,
6741335b S	230	TIMESYNCH_MAJOR_MINOR);
39c4e9c3	231	} else {
45241e50	232	timedatap = (struct ictimesync_data *)&time_txf_buf[
39c4e9c3 HZ	233	sizeof(struct vmbuspipe_hdr) +
	234	sizeof(struct icmsg_hdr)];
	235	adj_guesttime(timedatap->parenttime, timedatap->flags);
	236	}
	237
	238	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	239	\| ICMSGHDRFLAG_RESPONSE;
	240
45241e50	241	vmbus_sendpacket(channel, time_txf_buf,
39c4e9c3	242	recvlen, requestid,
415f2287	243	VM_PKT_DATA_INBAND, 0);
39c4e9c3	244	}
39c4e9c3 HZ	245	}
39c4e9c3 HZ	246
9153f7b9 HJ	247	/*
	248	* Heartbeat functionality.
	249	* Every two seconds, Hyper-V send us a heartbeat request message.
	250	* we respond to this message, and Hyper-V knows we are alive.
	251	*/
	252	static void heartbeat_onchannelcallback(void *context)
	253	{
	254	struct vmbus_channel *channel = context;
45241e50	255	u32 recvlen;
9153f7b9 HJ	256	u64 requestid;
	257	struct icmsg_hdr *icmsghdrp;
	258	struct heartbeat_msg_data *heartbeat_msg;
a29b643c	259	u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
9153f7b9	260
45241e50 HJ	261	vmbus_recvpacket(channel, hbeat_txf_buf,
45241e50 HJ	262	PAGE_SIZE, &recvlen, &requestid);
9153f7b9 HJ	263
9153f7b9 HJ	264	if (recvlen > 0) {
45241e50	265	icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
9153f7b9 HJ	266	sizeof(struct vmbuspipe_hdr)];
	267
	268	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab	269	vmbus_prep_negotiate_resp(icmsghdrp, NULL,
6741335b S	270	hbeat_txf_buf, UTIL_FW_MAJOR_MINOR,
6741335b S	271	HEARTBEAT_MAJOR_MINOR);
9153f7b9	272	} else {
45241e50 HJ	273	heartbeat_msg =
	274	(struct heartbeat_msg_data *)&hbeat_txf_buf[
	275	sizeof(struct vmbuspipe_hdr) +
	276	sizeof(struct icmsg_hdr)];
9153f7b9	277
9153f7b9 HJ	278	heartbeat_msg->seq_num += 1;
	279	}
	280
	281	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	282	\| ICMSGHDRFLAG_RESPONSE;
	283
45241e50	284	vmbus_sendpacket(channel, hbeat_txf_buf,
9153f7b9	285	recvlen, requestid,
415f2287	286	VM_PKT_DATA_INBAND, 0);
9153f7b9	287	}
9153f7b9	288	}
39c4e9c3	289
84946899 S	290	static int util_probe(struct hv_device *dev,
84946899 S	291	const struct hv_vmbus_device_id *dev_id)
283f2129	292	{
a29b643c S	293	struct hv_util_service *srv =
	294	(struct hv_util_service *)dev_id->driver_data;
	295	int ret;
	296
9b595780	297	srv->recv_buffer = kmalloc(PAGE_SIZE * 2, GFP_KERNEL);
a29b643c S	298	if (!srv->recv_buffer)
	299	return -ENOMEM;
	300	if (srv->util_init) {
	301	ret = srv->util_init(srv);
	302	if (ret) {
4e65f6e8 S	303	ret = -ENODEV;
4e65f6e8 S	304	goto error1;
a29b643c S	305	}
	306	}
	307
7ae3e035 S	308	/*
	309	* The set of services managed by the util driver are not performance
	310	* critical and do not need batched reading. Furthermore, some services
	311	* such as KVP can only handle one message from the host at a time.
	312	* Turn off batched reading for all util drivers before we open the
	313	* channel.
	314	*/
	315
	316	set_channel_read_state(dev->channel, false);
	317
9b595780	318	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
4e65f6e8 S	319	srv->util_cb, dev->channel);
	320	if (ret)
	321	goto error;
	322
a29b643c	323	hv_set_drvdata(dev, srv);
283f2129	324	return 0;
4e65f6e8 S	325
	326	error:
	327	if (srv->util_deinit)
	328	srv->util_deinit();
	329	error1:
	330	kfree(srv->recv_buffer);
	331	return ret;
283f2129 S	332	}
	333
	334	static int util_remove(struct hv_device *dev)
	335	{
a29b643c S	336	struct hv_util_service *srv = hv_get_drvdata(dev);
a29b643c S	337
4e65f6e8	338	vmbus_close(dev->channel);
a29b643c S	339	if (srv->util_deinit)
	340	srv->util_deinit();
	341	kfree(srv->recv_buffer);
	342
283f2129 S	343	return 0;
	344	}
	345
	346	static const struct hv_vmbus_device_id id_table[] = {
c45cf2d4	347	/* Shutdown guid */
d13984e5 S	348	{ HV_SHUTDOWN_GUID,
	349	.driver_data = (unsigned long)&util_shutdown
	350	},
c45cf2d4	351	/* Time synch guid */
d13984e5 S	352	{ HV_TS_GUID,
	353	.driver_data = (unsigned long)&util_timesynch
	354	},
c45cf2d4	355	/* Heartbeat guid */
d13984e5 S	356	{ HV_HEART_BEAT_GUID,
	357	.driver_data = (unsigned long)&util_heartbeat
	358	},
c45cf2d4	359	/* KVP guid */
d13984e5 S	360	{ HV_KVP_GUID,
	361	.driver_data = (unsigned long)&util_kvp
	362	},
96dd86fa S	363	/* VSS GUID */
	364	{ HV_VSS_GUID,
	365	.driver_data = (unsigned long)&util_vss
	366	},
c45cf2d4	367	{ },
283f2129 S	368	};
	369
	370	MODULE_DEVICE_TABLE(vmbus, id_table);
	371
	372	/* The one and only one */
	373	static struct hv_driver util_drv = {
768fa219	374	.name = "hv_util",
283f2129 S	375	.id_table = id_table,
	376	.probe = util_probe,
	377	.remove = util_remove,
	378	};
	379
c88c4e4c HJ	380	static int __init init_hyperv_utils(void)
c88c4e4c HJ	381	{
af7a5b6e	382	pr_info("Registering HyperV Utility Driver\n");
c88c4e4c	383
4e65f6e8	384	return vmbus_driver_register(&util_drv);
c88c4e4c HJ	385	}
	386
	387	static void exit_hyperv_utils(void)
	388	{
af7a5b6e	389	pr_info("De-Registered HyperV Utility Driver\n");
c88c4e4c	390
768fa219	391	vmbus_driver_unregister(&util_drv);
c88c4e4c HJ	392	}
	393
	394	module_init(init_hyperv_utils);
	395	module_exit(exit_hyperv_utils);
	396
	397	MODULE_DESCRIPTION("Hyper-V Utilities");
c88c4e4c	398	MODULE_LICENSE("GPL");