[net-next-2.6.git] / drivers / staging / hv / hyperv_utils.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>
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/version.h>

#include "logging.h"
#include "osd.h"
#include "vmbus.h"
#include "VmbusPacketFormat.h"
#include "VmbusChannelInterface.h"
#include "VersionInfo.h"
#include "Channel.h"
#include "VmbusPrivate.h"
#include "VmbusApi.h"
#include "utils.h"


void shutdown_onchannelcallback(void *context)
{
	struct vmbus_channel *channel = context;
	u8 *buf;
	u32 buflen, recvlen;
	u64 requestid;
	u8  execute_shutdown = false;

	struct shutdown_msg_data *shutdown_msg;

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

	DPRINT_ENTER(VMBUS);

	buflen = PAGE_SIZE;
	buf = kmalloc(buflen, GFP_ATOMIC);

	VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);

	if (recvlen > 0) {
		DPRINT_DBG(VMBUS, "shutdown packet: len=%d, requestid=%lld",
			   recvlen, requestid);

		icmsghdrp = (struct icmsg_hdr *)&buf[
			sizeof(struct vmbuspipe_hdr)];

		if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
			prep_negotiate_resp(icmsghdrp, negop, buf);
		} else {
			shutdown_msg = (struct shutdown_msg_data *)&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;

				DPRINT_INFO(VMBUS, "Shutdown request received -"
					    " gracefull shutdown initiated");
				break;
			default:
				icmsghdrp->status = HV_E_FAIL;
				execute_shutdown = false;

				DPRINT_INFO(VMBUS, "Shutdown request received -"
					    " Invalid request");
				break;
			};
		}

		icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
			| ICMSGHDRFLAG_RESPONSE;

		VmbusChannelSendPacket(channel, buf,
				       recvlen, requestid,
				       VmbusPacketTypeDataInBand, 0);
	}

	kfree(buf);

	DPRINT_EXIT(VMBUS);

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

static int __init init_hyperv_utils(void)
{
	printk(KERN_INFO "Registering HyperV Utility Driver\n");

	hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
		&shutdown_onchannelcallback;
	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;

	return 0;
}

static void exit_hyperv_utils(void)
{
	printk(KERN_INFO "De-Registered HyperV Utility Driver\n");

	hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
		&chn_cb_negotiate;
	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
}

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	*/
	21	#include <linux/kernel.h>
	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/slab.h>
	25	#include <linux/sysctl.h>
	26	#include <linux/version.h>
	27
	28	#include "logging.h"
	29	#include "osd.h"
	30	#include "vmbus.h"
	31	#include "VmbusPacketFormat.h"
	32	#include "VmbusChannelInterface.h"
	33	#include "VersionInfo.h"
	34	#include "Channel.h"
	35	#include "VmbusPrivate.h"
	36	#include "VmbusApi.h"
	37	#include "utils.h"
	38
	39
	40	void shutdown_onchannelcallback(void *context)
	41	{
	42	struct vmbus_channel *channel = context;
	43	u8 *buf;
	44	u32 buflen, recvlen;
	45	u64 requestid;
	46	u8 execute_shutdown = false;
	47
	48	struct shutdown_msg_data *shutdown_msg;
	49
	50	struct icmsg_hdr *icmsghdrp;
	51	struct icmsg_negotiate *negop = NULL;
	52
	53	DPRINT_ENTER(VMBUS);
	54
	55	buflen = PAGE_SIZE;
	56	buf = kmalloc(buflen, GFP_ATOMIC);
	57
	58	VmbusChannelRecvPacket(channel, buf, buflen, &recvlen, &requestid);
	59
	60	if (recvlen > 0) {
	61	DPRINT_DBG(VMBUS, "shutdown packet: len=%d, requestid=%lld",
	62	recvlen, requestid);
	63
	64	icmsghdrp = (struct icmsg_hdr *)&buf[
65	sizeof(struct vmbuspipe_hdr)];
66
67	if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
68	prep_negotiate_resp(icmsghdrp, negop, buf);
69	} else {
70	shutdown_msg = (struct shutdown_msg_data *)&buf[
71	sizeof(struct vmbuspipe_hdr) +
72	sizeof(struct icmsg_hdr)];
73
74	switch (shutdown_msg->flags) {
75	case 0:
76	case 1:
77	icmsghdrp->status = HV_S_OK;
78	execute_shutdown = true;
79
80	DPRINT_INFO(VMBUS, "Shutdown request received -"
81	" gracefull shutdown initiated");
82	break;
83	default:
84	icmsghdrp->status = HV_E_FAIL;
85	execute_shutdown = false;
86
87	DPRINT_INFO(VMBUS, "Shutdown request received -"
88	" Invalid request");
89	break;
90	};
91	}
92
93	icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
94	\| ICMSGHDRFLAG_RESPONSE;
95
96	VmbusChannelSendPacket(channel, buf,
97	recvlen, requestid,
98	VmbusPacketTypeDataInBand, 0);
99	}
100
101	kfree(buf);
102
103	DPRINT_EXIT(VMBUS);
104
105	if (execute_shutdown == true)
106	shutdown_linux_system();
107	}
108
109	static int __init init_hyperv_utils(void)
110	{
111	printk(KERN_INFO "Registering HyperV Utility Driver\n");
112
113	hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
114	&shutdown_onchannelcallback;
115	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &shutdown_onchannelcallback;
116
117	return 0;
118	}
119
120	static void exit_hyperv_utils(void)
121	{
122	printk(KERN_INFO "De-Registered HyperV Utility Driver\n");
123
124	hv_cb_utils[HV_SHUTDOWN_MSG].channel->OnChannelCallback =
125	&chn_cb_negotiate;
126	hv_cb_utils[HV_SHUTDOWN_MSG].callback = &chn_cb_negotiate;
127	}
128
129	module_init(init_hyperv_utils);
130	module_exit(exit_hyperv_utils);
131
132	MODULE_DESCRIPTION("Hyper-V Utilities");
133	MODULE_VERSION(HV_DRV_VERSION);
134	MODULE_LICENSE("GPL");