[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 <[email protected]>
 *   Hank Janssen  <[email protected]>
 */
#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>

#include "hyperv_vmbus.h"

#define SD_MAJOR	3
#define SD_MINOR	0
#define SD_VERSION	(SD_MAJOR << 16 | SD_MINOR)

#define SD_WS2008_MAJOR		1
#define SD_WS2008_VERSION	(SD_WS2008_MAJOR << 16 | SD_MINOR)

#define TS_MAJOR	3
#define TS_MINOR	0
#define TS_VERSION	(TS_MAJOR << 16 | TS_MINOR)

#define TS_WS2008_MAJOR		1
#define TS_WS2008_VERSION	(TS_WS2008_MAJOR << 16 | TS_MINOR)

#define HB_MAJOR	3
#define HB_MINOR 0
#define HB_VERSION	(HB_MAJOR << 16 | HB_MINOR)

#define HB_WS2008_MAJOR	1
#define HB_WS2008_VERSION	(HB_WS2008_MAJOR << 16 | HB_MINOR)

static int sd_srv_version;
static int ts_srv_version;
static int hb_srv_version;
static int util_fw_version;

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 struct hv_util_service util_fcopy = {
	.util_cb = hv_fcopy_onchannelcallback,
	.util_init = hv_fcopy_init,
	.util_deinit = hv_fcopy_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;
	bool 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_version,
					sd_srv_version);
		} 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;
	struct icmsg_negotiate *negop = NULL;

	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, negop,
						time_txf_buf,
						util_fw_version,
						ts_srv_version);
		} 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;
	struct icmsg_negotiate *negop = NULL;

	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, negop,
				hbeat_txf_buf, util_fw_version,
				hb_srv_version);
		} 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 * 4, 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);

	hv_set_drvdata(dev, srv);

	/*
	 * Based on the host; initialize the framework and
	 * service version numbers we will negotiate.
	 */
	switch (vmbus_proto_version) {
	case (VERSION_WS2008):
		util_fw_version = UTIL_WS2K8_FW_VERSION;
		sd_srv_version = SD_WS2008_VERSION;
		ts_srv_version = TS_WS2008_VERSION;
		hb_srv_version = HB_WS2008_VERSION;
		break;

	default:
		util_fw_version = UTIL_FW_VERSION;
		sd_srv_version = SD_VERSION;
		ts_srv_version = TS_VERSION;
		hb_srv_version = HB_VERSION;
	}

	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
			srv->util_cb, dev->channel);
	if (ret)
		goto error;

	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);

	if (srv->util_deinit)
		srv->util_deinit();
	vmbus_close(dev->channel);
	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
	},
	/* File copy GUID */
	{ HV_FCOPY_GUID,
	  .driver_data = (unsigned long)&util_fcopy
	},
	{ },
};

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 <[email protected]>
	19	* Hank Janssen <[email protected]>
	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
01325476	31	#include "hyperv_vmbus.h"
6741335b	32
3a491605 S	33	#define SD_MAJOR 3
	34	#define SD_MINOR 0
	35	#define SD_VERSION (SD_MAJOR << 16 \| SD_MINOR)
6741335b	36
3a491605 S	37	#define SD_WS2008_MAJOR 1
	38	#define SD_WS2008_VERSION (SD_WS2008_MAJOR << 16 \| SD_MINOR)
	39
	40	#define TS_MAJOR 3
	41	#define TS_MINOR 0
	42	#define TS_VERSION (TS_MAJOR << 16 \| TS_MINOR)
	43
	44	#define TS_WS2008_MAJOR 1
	45	#define TS_WS2008_VERSION (TS_WS2008_MAJOR << 16 \| TS_MINOR)
	46
	47	#define HB_MAJOR 3
	48	#define HB_MINOR 0
	49	#define HB_VERSION (HB_MAJOR << 16 \| HB_MINOR)
	50
	51	#define HB_WS2008_MAJOR 1
	52	#define HB_WS2008_VERSION (HB_WS2008_MAJOR << 16 \| HB_MINOR)
	53
	54	static int sd_srv_version;
	55	static int ts_srv_version;
	56	static int hb_srv_version;
	57	static int util_fw_version;
6741335b	58
a29b643c S	59	static void shutdown_onchannelcallback(void *context);
	60	static struct hv_util_service util_shutdown = {
	61	.util_cb = shutdown_onchannelcallback,
	62	};
	63
	64	static void timesync_onchannelcallback(void *context);
	65	static struct hv_util_service util_timesynch = {
	66	.util_cb = timesync_onchannelcallback,
	67	};
	68
	69	static void heartbeat_onchannelcallback(void *context);
	70	static struct hv_util_service util_heartbeat = {
	71	.util_cb = heartbeat_onchannelcallback,
	72	};
	73
	74	static struct hv_util_service util_kvp = {
	75	.util_cb = hv_kvp_onchannelcallback,
	76	.util_init = hv_kvp_init,
	77	.util_deinit = hv_kvp_deinit,
	78	};
c88c4e4c	79
96dd86fa S	80	static struct hv_util_service util_vss = {
	81	.util_cb = hv_vss_onchannelcallback,
	82	.util_init = hv_vss_init,
	83	.util_deinit = hv_vss_deinit,
	84	};
	85
01325476 S	86	static struct hv_util_service util_fcopy = {
	87	.util_cb = hv_fcopy_onchannelcallback,
	88	.util_init = hv_fcopy_init,
	89	.util_deinit = hv_fcopy_deinit,
	90	};
	91
3dd6cb49 S	92	static void perform_shutdown(struct work_struct *dummy)
	93	{
	94	orderly_poweroff(true);
	95	}
	96
	97	/*
	98	* Perform the shutdown operation in a thread context.
	99	*/
	100	static DECLARE_WORK(shutdown_work, perform_shutdown);
	101
6610944a	102	static void shutdown_onchannelcallback(void *context)
c88c4e4c HJ	103	{
c88c4e4c HJ	104	struct vmbus_channel *channel = context;
45241e50	105	u32 recvlen;
c88c4e4c	106	u64 requestid;
31734634	107	bool execute_shutdown = false;
a29b643c	108	u8 *shut_txf_buf = util_shutdown.recv_buffer;
c88c4e4c HJ	109
	110	struct shutdown_msg_data *shutdown_msg;
	111
	112	struct icmsg_hdr *icmsghdrp;
	113	struct icmsg_negotiate *negop = NULL;
	114
45241e50 HJ	115	vmbus_recvpacket(channel, shut_txf_buf,
45241e50 HJ	116	PAGE_SIZE, &recvlen, &requestid);
c88c4e4c HJ	117
c88c4e4c HJ	118	if (recvlen > 0) {
45241e50	119	icmsghdrp = (struct icmsg_hdr *)&shut_txf_buf[
c88c4e4c HJ	120	sizeof(struct vmbuspipe_hdr)];
	121
	122	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
c836d0ab	123	vmbus_prep_negotiate_resp(icmsghdrp, negop,
3a491605 S	124	shut_txf_buf, util_fw_version,
3a491605 S	125	sd_srv_version);
c88c4e4c	126	} else {
45241e50 HJ	127	shutdown_msg =
	128	(struct shutdown_msg_data *)&shut_txf_buf[
	129	sizeof(struct vmbuspipe_hdr) +
	130	sizeof(struct icmsg_hdr)];
c88c4e4c HJ	131
	132	switch (shutdown_msg->flags) {
	133	case 0:
	134	case 1:
	135	icmsghdrp->status = HV_S_OK;
	136	execute_shutdown = true;
	137
af7a5b6e	138	pr_info("Shutdown request received -"
32235b07	139	" graceful shutdown initiated\n");
c88c4e4c HJ	140	break;
	141	default:
	142	icmsghdrp->status = HV_E_FAIL;
	143	execute_shutdown = false;
	144
af7a5b6e HJ	145	pr_info("Shutdown request received -"
af7a5b6e HJ	146	" Invalid request\n");
c88c4e4c	147	break;
95cd17c9	148	}
c88c4e4c HJ	149	}
	150
	151	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	152	\| ICMSGHDRFLAG_RESPONSE;
	153
45241e50	154	vmbus_sendpacket(channel, shut_txf_buf,
c88c4e4c	155	recvlen, requestid,
415f2287	156	VM_PKT_DATA_INBAND, 0);
c88c4e4c HJ	157	}
c88c4e4c HJ	158
c88c4e4c	159	if (execute_shutdown == true)
3dd6cb49	160	schedule_work(&shutdown_work);
c88c4e4c HJ	161	}
c88c4e4c HJ	162
39c4e9c3	163	/*
e9ec3603	164	* Set guest time to host UTC time.
39c4e9c3	165	*/
e9ec3603	166	static inline void do_adj_guesttime(u64 hosttime)
39c4e9c3 HZ	167	{
	168	s64 host_tns;
	169	struct timespec host_ts;
39c4e9c3 HZ	170
	171	host_tns = (hosttime - WLTIMEDELTA) * 100;
	172	host_ts = ns_to_timespec(host_tns);
	173
e9ec3603 HZ	174	do_settimeofday(&host_ts);
	175	}
	176
95ff7cde S	177	/*
	178	* Set the host time in a process context.
	179	*/
	180
	181	struct adj_time_work {
	182	struct work_struct work;
	183	u64 host_time;
	184	};
	185
	186	static void hv_set_host_time(struct work_struct *work)
	187	{
	188	struct adj_time_work *wrk;
	189
	190	wrk = container_of(work, struct adj_time_work, work);
	191	do_adj_guesttime(wrk->host_time);
	192	kfree(wrk);
	193	}
	194
e9ec3603 HZ	195	/*
	196	* Synchronize time with host after reboot, restore, etc.
	197	*
	198	* ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
	199	* After reboot the flag ICTIMESYNCFLAG_SYNC is included in the first time
	200	* message after the timesync channel is opened. Since the hv_utils module is
	201	* loaded after hv_vmbus, the first message is usually missed. The other
	202	* thing is, systime is automatically set to emulated hardware clock which may
	203	* not be UTC time or in the same time zone. So, to override these effects, we
	204	* use the first 50 time samples for initial system time setting.
	205	*/
	206	static inline void adj_guesttime(u64 hosttime, u8 flags)
	207	{
95ff7cde	208	struct adj_time_work *wrk;
e9ec3603 HZ	209	static s32 scnt = 50;
e9ec3603 HZ	210
95ff7cde S	211	wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
	212	if (wrk == NULL)
	213	return;
	214
	215	wrk->host_time = hosttime;
39c4e9c3	216	if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
95ff7cde S	217	INIT_WORK(&wrk->work, hv_set_host_time);
95ff7cde S	218	schedule_work(&wrk->work);
39c4e9c3 HZ	219	return;
	220	}
	221
e9ec3603	222	if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
39c4e9c3	223	scnt--;
95ff7cde S	224	INIT_WORK(&wrk->work, hv_set_host_time);
	225	schedule_work(&wrk->work);
	226	} else
	227	kfree(wrk);
39c4e9c3 HZ	228	}
	229
	230	/*
	231	* Time Sync Channel message handler.
	232	*/
	233	static void timesync_onchannelcallback(void *context)
	234	{
	235	struct vmbus_channel *channel = context;
45241e50	236	u32 recvlen;
39c4e9c3 HZ	237	u64 requestid;
	238	struct icmsg_hdr *icmsghdrp;
	239	struct ictimesync_data *timedatap;
a29b643c	240	u8 *time_txf_buf = util_timesynch.recv_buffer;
3a491605	241	struct icmsg_negotiate *negop = NULL;
39c4e9c3	242
45241e50 HJ	243	vmbus_recvpacket(channel, time_txf_buf,
45241e50 HJ	244	PAGE_SIZE, &recvlen, &requestid);
39c4e9c3 HZ	245
39c4e9c3 HZ	246	if (recvlen > 0) {
45241e50	247	icmsghdrp = (struct icmsg_hdr *)&time_txf_buf[
39c4e9c3 HZ	248	sizeof(struct vmbuspipe_hdr)];
	249
	250	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
3a491605 S	251	vmbus_prep_negotiate_resp(icmsghdrp, negop,
	252	time_txf_buf,
	253	util_fw_version,
	254	ts_srv_version);
39c4e9c3	255	} else {
45241e50	256	timedatap = (struct ictimesync_data *)&time_txf_buf[
39c4e9c3 HZ	257	sizeof(struct vmbuspipe_hdr) +
	258	sizeof(struct icmsg_hdr)];
	259	adj_guesttime(timedatap->parenttime, timedatap->flags);
	260	}
	261
	262	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	263	\| ICMSGHDRFLAG_RESPONSE;
	264
45241e50	265	vmbus_sendpacket(channel, time_txf_buf,
39c4e9c3	266	recvlen, requestid,
415f2287	267	VM_PKT_DATA_INBAND, 0);
39c4e9c3	268	}
39c4e9c3 HZ	269	}
39c4e9c3 HZ	270
9153f7b9 HJ	271	/*
	272	* Heartbeat functionality.
	273	* Every two seconds, Hyper-V send us a heartbeat request message.
	274	* we respond to this message, and Hyper-V knows we are alive.
	275	*/
	276	static void heartbeat_onchannelcallback(void *context)
	277	{
	278	struct vmbus_channel *channel = context;
45241e50	279	u32 recvlen;
9153f7b9 HJ	280	u64 requestid;
	281	struct icmsg_hdr *icmsghdrp;
	282	struct heartbeat_msg_data *heartbeat_msg;
a29b643c	283	u8 *hbeat_txf_buf = util_heartbeat.recv_buffer;
3a491605	284	struct icmsg_negotiate *negop = NULL;
9153f7b9	285
45241e50 HJ	286	vmbus_recvpacket(channel, hbeat_txf_buf,
45241e50 HJ	287	PAGE_SIZE, &recvlen, &requestid);
9153f7b9 HJ	288
9153f7b9 HJ	289	if (recvlen > 0) {
45241e50	290	icmsghdrp = (struct icmsg_hdr *)&hbeat_txf_buf[
9153f7b9 HJ	291	sizeof(struct vmbuspipe_hdr)];
	292
	293	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
3a491605 S	294	vmbus_prep_negotiate_resp(icmsghdrp, negop,
	295	hbeat_txf_buf, util_fw_version,
	296	hb_srv_version);
9153f7b9	297	} else {
45241e50 HJ	298	heartbeat_msg =
	299	(struct heartbeat_msg_data *)&hbeat_txf_buf[
	300	sizeof(struct vmbuspipe_hdr) +
	301	sizeof(struct icmsg_hdr)];
9153f7b9	302
9153f7b9 HJ	303	heartbeat_msg->seq_num += 1;
	304	}
	305
	306	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
	307	\| ICMSGHDRFLAG_RESPONSE;
	308
45241e50	309	vmbus_sendpacket(channel, hbeat_txf_buf,
9153f7b9	310	recvlen, requestid,
415f2287	311	VM_PKT_DATA_INBAND, 0);
9153f7b9	312	}
9153f7b9	313	}
39c4e9c3	314
84946899 S	315	static int util_probe(struct hv_device *dev,
84946899 S	316	const struct hv_vmbus_device_id *dev_id)
283f2129	317	{
a29b643c S	318	struct hv_util_service *srv =
	319	(struct hv_util_service *)dev_id->driver_data;
	320	int ret;
	321
9bd2d0df	322	srv->recv_buffer = kmalloc(PAGE_SIZE * 4, GFP_KERNEL);
a29b643c S	323	if (!srv->recv_buffer)
	324	return -ENOMEM;
	325	if (srv->util_init) {
	326	ret = srv->util_init(srv);
	327	if (ret) {
4e65f6e8 S	328	ret = -ENODEV;
4e65f6e8 S	329	goto error1;
a29b643c S	330	}
	331	}
	332
7ae3e035 S	333	/*
	334	* The set of services managed by the util driver are not performance
	335	* critical and do not need batched reading. Furthermore, some services
	336	* such as KVP can only handle one message from the host at a time.
	337	* Turn off batched reading for all util drivers before we open the
	338	* channel.
	339	*/
	340
	341	set_channel_read_state(dev->channel, false);
	342
a29b643c	343	hv_set_drvdata(dev, srv);
18965663	344
3a491605 S	345	/*
	346	* Based on the host; initialize the framework and
	347	* service version numbers we will negotiate.
	348	*/
	349	switch (vmbus_proto_version) {
	350	case (VERSION_WS2008):
	351	util_fw_version = UTIL_WS2K8_FW_VERSION;
	352	sd_srv_version = SD_WS2008_VERSION;
	353	ts_srv_version = TS_WS2008_VERSION;
	354	hb_srv_version = HB_WS2008_VERSION;
	355	break;
	356
	357	default:
	358	util_fw_version = UTIL_FW_VERSION;
	359	sd_srv_version = SD_VERSION;
	360	ts_srv_version = TS_VERSION;
	361	hb_srv_version = HB_VERSION;
	362	}
	363
18965663 DC	364	ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
	365	srv->util_cb, dev->channel);
	366	if (ret)
	367	goto error;
	368
283f2129	369	return 0;
4e65f6e8 S	370
	371	error:
	372	if (srv->util_deinit)
	373	srv->util_deinit();
	374	error1:
	375	kfree(srv->recv_buffer);
	376	return ret;
283f2129 S	377	}
	378
	379	static int util_remove(struct hv_device *dev)
	380	{
a29b643c S	381	struct hv_util_service *srv = hv_get_drvdata(dev);
	382
	383	if (srv->util_deinit)
	384	srv->util_deinit();
5380b383	385	vmbus_close(dev->channel);
a29b643c S	386	kfree(srv->recv_buffer);
a29b643c S	387
283f2129 S	388	return 0;
	389	}
	390
	391	static const struct hv_vmbus_device_id id_table[] = {
c45cf2d4	392	/* Shutdown guid */
d13984e5 S	393	{ HV_SHUTDOWN_GUID,
	394	.driver_data = (unsigned long)&util_shutdown
	395	},
c45cf2d4	396	/* Time synch guid */
d13984e5 S	397	{ HV_TS_GUID,
	398	.driver_data = (unsigned long)&util_timesynch
	399	},
c45cf2d4	400	/* Heartbeat guid */
d13984e5 S	401	{ HV_HEART_BEAT_GUID,
	402	.driver_data = (unsigned long)&util_heartbeat
	403	},
c45cf2d4	404	/* KVP guid */
d13984e5 S	405	{ HV_KVP_GUID,
	406	.driver_data = (unsigned long)&util_kvp
	407	},
96dd86fa S	408	/* VSS GUID */
	409	{ HV_VSS_GUID,
	410	.driver_data = (unsigned long)&util_vss
	411	},
01325476 S	412	/* File copy GUID */
	413	{ HV_FCOPY_GUID,
	414	.driver_data = (unsigned long)&util_fcopy
	415	},
c45cf2d4	416	{ },
283f2129 S	417	};
	418
	419	MODULE_DEVICE_TABLE(vmbus, id_table);
	420
	421	/* The one and only one */
	422	static struct hv_driver util_drv = {
768fa219	423	.name = "hv_util",
283f2129 S	424	.id_table = id_table,
	425	.probe = util_probe,
	426	.remove = util_remove,
	427	};
	428
c88c4e4c HJ	429	static int __init init_hyperv_utils(void)
c88c4e4c HJ	430	{
af7a5b6e	431	pr_info("Registering HyperV Utility Driver\n");
c88c4e4c	432
4e65f6e8	433	return vmbus_driver_register(&util_drv);
c88c4e4c HJ	434	}
	435
	436	static void exit_hyperv_utils(void)
	437	{
af7a5b6e	438	pr_info("De-Registered HyperV Utility Driver\n");
c88c4e4c	439
768fa219	440	vmbus_driver_unregister(&util_drv);
c88c4e4c HJ	441	}
	442
	443	module_init(init_hyperv_utils);
	444	module_exit(exit_hyperv_utils);
	445
	446	MODULE_DESCRIPTION("Hyper-V Utilities");
c88c4e4c	447	MODULE_LICENSE("GPL");