hyperv.h 33.8 KB
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/*
 *
 * Copyright (c) 2011, 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>
 *   K. Y. Srinivasan <kys@microsoft.com>
 *
 */
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#ifndef _HYPERV_H
#define _HYPERV_H

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#include <uapi/linux/hyperv.h>
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#include <uapi/asm/hyperv.h>
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#include <linux/types.h>
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#include <linux/scatterlist.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#define MAX_PAGE_BUFFER_COUNT				32
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#define MAX_MULTIPAGE_BUFFER_COUNT			32 /* 128K */

#pragma pack(push, 1)

/* Single-page buffer */
struct hv_page_buffer {
	u32 len;
	u32 offset;
	u64 pfn;
};

/* Multiple-page buffer */
struct hv_multipage_buffer {
	/* Length and Offset determines the # of pfns in the array */
	u32 len;
	u32 offset;
	u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
};

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/*
 * Multiple-page buffer array; the pfn array is variable size:
 * The number of entries in the PFN array is determined by
 * "len" and "offset".
 */
struct hv_mpb_array {
	/* Length and Offset determines the # of pfns in the array */
	u32 len;
	u32 offset;
	u64 pfn_array[];
};

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/* 0x18 includes the proprietary packet header */
#define MAX_PAGE_BUFFER_PACKET		(0x18 +			\
					(sizeof(struct hv_page_buffer) * \
					 MAX_PAGE_BUFFER_COUNT))
#define MAX_MULTIPAGE_BUFFER_PACKET	(0x18 +			\
					 sizeof(struct hv_multipage_buffer))


#pragma pack(pop)

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struct hv_ring_buffer {
	/* Offset in bytes from the start of ring data below */
	u32 write_index;

	/* Offset in bytes from the start of ring data below */
	u32 read_index;

	u32 interrupt_mask;

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	/*
	 * Win8 uses some of the reserved bits to implement
	 * interrupt driven flow management. On the send side
	 * we can request that the receiver interrupt the sender
	 * when the ring transitions from being full to being able
	 * to handle a message of size "pending_send_sz".
	 *
	 * Add necessary state for this enhancement.
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	 */
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	u32 pending_send_sz;

	u32 reserved1[12];

	union {
		struct {
			u32 feat_pending_send_sz:1;
		};
		u32 value;
	} feature_bits;

	/* Pad it to PAGE_SIZE so that data starts on page boundary */
	u8	reserved2[4028];
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	/*
	 * Ring data starts here + RingDataStartOffset
	 * !!! DO NOT place any fields below this !!!
	 */
	u8 buffer[0];
} __packed;

struct hv_ring_buffer_info {
	struct hv_ring_buffer *ring_buffer;
	u32 ring_size;			/* Include the shared header */
	spinlock_t ring_lock;

	u32 ring_datasize;		/* < ring_size */
	u32 ring_data_startoffset;
};

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/*
 *
 * hv_get_ringbuffer_availbytes()
 *
 * Get number of bytes available to read and to write to
 * for the specified ring buffer
 */
static inline void
hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
			  u32 *read, u32 *write)
{
	u32 read_loc, write_loc, dsize;

	/* Capture the read/write indices before they changed */
	read_loc = rbi->ring_buffer->read_index;
	write_loc = rbi->ring_buffer->write_index;
	dsize = rbi->ring_datasize;

	*write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
		read_loc - write_loc;
	*read = dsize - *write;
}

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/*
 * VMBUS version is 32 bit entity broken up into
 * two 16 bit quantities: major_number. minor_number.
 *
 * 0 . 13 (Windows Server 2008)
 * 1 . 1  (Windows 7)
 * 2 . 4  (Windows 8)
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 * 3 . 0  (Windows 8 R2)
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 * 4 . 0  (Windows 10)
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 */

#define VERSION_WS2008  ((0 << 16) | (13))
#define VERSION_WIN7    ((1 << 16) | (1))
#define VERSION_WIN8    ((2 << 16) | (4))
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#define VERSION_WIN8_1    ((3 << 16) | (0))
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#define VERSION_WIN10	((4 << 16) | (0))
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#define VERSION_INVAL -1

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#define VERSION_CURRENT VERSION_WIN10
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/* Make maximum size of pipe payload of 16K */
#define MAX_PIPE_DATA_PAYLOAD		(sizeof(u8) * 16384)

/* Define PipeMode values. */
#define VMBUS_PIPE_TYPE_BYTE		0x00000000
#define VMBUS_PIPE_TYPE_MESSAGE		0x00000004

/* The size of the user defined data buffer for non-pipe offers. */
#define MAX_USER_DEFINED_BYTES		120

/* The size of the user defined data buffer for pipe offers. */
#define MAX_PIPE_USER_DEFINED_BYTES	116

/*
 * At the center of the Channel Management library is the Channel Offer. This
 * struct contains the fundamental information about an offer.
 */
struct vmbus_channel_offer {
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	uuid_le if_type;
	uuid_le if_instance;
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	/*
	 * These two fields are not currently used.
	 */
	u64 reserved1;
	u64 reserved2;

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	u16 chn_flags;
	u16 mmio_megabytes;		/* in bytes * 1024 * 1024 */

	union {
		/* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
		struct {
			unsigned char user_def[MAX_USER_DEFINED_BYTES];
		} std;

		/*
		 * Pipes:
		 * The following sructure is an integrated pipe protocol, which
		 * is implemented on top of standard user-defined data. Pipe
		 * clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
		 * use.
		 */
		struct {
			u32  pipe_mode;
			unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
		} pipe;
	} u;
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	/*
	 * The sub_channel_index is defined in win8.
	 */
	u16 sub_channel_index;
	u16 reserved3;
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} __packed;

/* Server Flags */
#define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE	1
#define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES	2
#define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS		4
#define VMBUS_CHANNEL_NAMED_PIPE_MODE			0x10
#define VMBUS_CHANNEL_LOOPBACK_OFFER			0x100
#define VMBUS_CHANNEL_PARENT_OFFER			0x200
#define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION	0x400
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#define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER		0x2000
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struct vmpacket_descriptor {
	u16 type;
	u16 offset8;
	u16 len8;
	u16 flags;
	u64 trans_id;
} __packed;

struct vmpacket_header {
	u32 prev_pkt_start_offset;
	struct vmpacket_descriptor descriptor;
} __packed;

struct vmtransfer_page_range {
	u32 byte_count;
	u32 byte_offset;
} __packed;

struct vmtransfer_page_packet_header {
	struct vmpacket_descriptor d;
	u16 xfer_pageset_id;
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	u8  sender_owns_set;
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	u8 reserved;
	u32 range_cnt;
	struct vmtransfer_page_range ranges[1];
} __packed;

struct vmgpadl_packet_header {
	struct vmpacket_descriptor d;
	u32 gpadl;
	u32 reserved;
} __packed;

struct vmadd_remove_transfer_page_set {
	struct vmpacket_descriptor d;
	u32 gpadl;
	u16 xfer_pageset_id;
	u16 reserved;
} __packed;

/*
 * This structure defines a range in guest physical space that can be made to
 * look virtually contiguous.
 */
struct gpa_range {
	u32 byte_count;
	u32 byte_offset;
	u64 pfn_array[0];
};

/*
 * This is the format for an Establish Gpadl packet, which contains a handle by
 * which this GPADL will be known and a set of GPA ranges associated with it.
 * This can be converted to a MDL by the guest OS.  If there are multiple GPA
 * ranges, then the resulting MDL will be "chained," representing multiple VA
 * ranges.
 */
struct vmestablish_gpadl {
	struct vmpacket_descriptor d;
	u32 gpadl;
	u32 range_cnt;
	struct gpa_range range[1];
} __packed;

/*
 * This is the format for a Teardown Gpadl packet, which indicates that the
 * GPADL handle in the Establish Gpadl packet will never be referenced again.
 */
struct vmteardown_gpadl {
	struct vmpacket_descriptor d;
	u32 gpadl;
	u32 reserved;	/* for alignment to a 8-byte boundary */
} __packed;

/*
 * This is the format for a GPA-Direct packet, which contains a set of GPA
 * ranges, in addition to commands and/or data.
 */
struct vmdata_gpa_direct {
	struct vmpacket_descriptor d;
	u32 reserved;
	u32 range_cnt;
	struct gpa_range range[1];
} __packed;

/* This is the format for a Additional Data Packet. */
struct vmadditional_data {
	struct vmpacket_descriptor d;
	u64 total_bytes;
	u32 offset;
	u32 byte_cnt;
	unsigned char data[1];
} __packed;

union vmpacket_largest_possible_header {
	struct vmpacket_descriptor simple_hdr;
	struct vmtransfer_page_packet_header xfer_page_hdr;
	struct vmgpadl_packet_header gpadl_hdr;
	struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
	struct vmestablish_gpadl establish_gpadl_hdr;
	struct vmteardown_gpadl teardown_gpadl_hdr;
	struct vmdata_gpa_direct data_gpa_direct_hdr;
};

#define VMPACKET_DATA_START_ADDRESS(__packet)	\
	(void *)(((unsigned char *)__packet) +	\
	 ((struct vmpacket_descriptor)__packet)->offset8 * 8)

#define VMPACKET_DATA_LENGTH(__packet)		\
	((((struct vmpacket_descriptor)__packet)->len8 -	\
	  ((struct vmpacket_descriptor)__packet)->offset8) * 8)

#define VMPACKET_TRANSFER_MODE(__packet)	\
	(((struct IMPACT)__packet)->type)

enum vmbus_packet_type {
	VM_PKT_INVALID				= 0x0,
	VM_PKT_SYNCH				= 0x1,
	VM_PKT_ADD_XFER_PAGESET			= 0x2,
	VM_PKT_RM_XFER_PAGESET			= 0x3,
	VM_PKT_ESTABLISH_GPADL			= 0x4,
	VM_PKT_TEARDOWN_GPADL			= 0x5,
	VM_PKT_DATA_INBAND			= 0x6,
	VM_PKT_DATA_USING_XFER_PAGES		= 0x7,
	VM_PKT_DATA_USING_GPADL			= 0x8,
	VM_PKT_DATA_USING_GPA_DIRECT		= 0x9,
	VM_PKT_CANCEL_REQUEST			= 0xa,
	VM_PKT_COMP				= 0xb,
	VM_PKT_DATA_USING_ADDITIONAL_PKT	= 0xc,
	VM_PKT_ADDITIONAL_DATA			= 0xd
};

#define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED	1
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/* Version 1 messages */
enum vmbus_channel_message_type {
	CHANNELMSG_INVALID			=  0,
	CHANNELMSG_OFFERCHANNEL		=  1,
	CHANNELMSG_RESCIND_CHANNELOFFER	=  2,
	CHANNELMSG_REQUESTOFFERS		=  3,
	CHANNELMSG_ALLOFFERS_DELIVERED	=  4,
	CHANNELMSG_OPENCHANNEL		=  5,
	CHANNELMSG_OPENCHANNEL_RESULT		=  6,
	CHANNELMSG_CLOSECHANNEL		=  7,
	CHANNELMSG_GPADL_HEADER		=  8,
	CHANNELMSG_GPADL_BODY			=  9,
	CHANNELMSG_GPADL_CREATED		= 10,
	CHANNELMSG_GPADL_TEARDOWN		= 11,
	CHANNELMSG_GPADL_TORNDOWN		= 12,
	CHANNELMSG_RELID_RELEASED		= 13,
	CHANNELMSG_INITIATE_CONTACT		= 14,
	CHANNELMSG_VERSION_RESPONSE		= 15,
	CHANNELMSG_UNLOAD			= 16,
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	CHANNELMSG_UNLOAD_RESPONSE		= 17,
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	CHANNELMSG_18				= 18,
	CHANNELMSG_19				= 19,
	CHANNELMSG_20				= 20,
	CHANNELMSG_TL_CONNECT_REQUEST		= 21,
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	CHANNELMSG_COUNT
};

struct vmbus_channel_message_header {
	enum vmbus_channel_message_type msgtype;
	u32 padding;
} __packed;

/* Query VMBus Version parameters */
struct vmbus_channel_query_vmbus_version {
	struct vmbus_channel_message_header header;
	u32 version;
} __packed;

/* VMBus Version Supported parameters */
struct vmbus_channel_version_supported {
	struct vmbus_channel_message_header header;
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	u8 version_supported;
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} __packed;

/* Offer Channel parameters */
struct vmbus_channel_offer_channel {
	struct vmbus_channel_message_header header;
	struct vmbus_channel_offer offer;
	u32 child_relid;
	u8 monitorid;
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	/*
	 * win7 and beyond splits this field into a bit field.
	 */
	u8 monitor_allocated:1;
	u8 reserved:7;
	/*
	 * These are new fields added in win7 and later.
	 * Do not access these fields without checking the
	 * negotiated protocol.
	 *
	 * If "is_dedicated_interrupt" is set, we must not set the
	 * associated bit in the channel bitmap while sending the
	 * interrupt to the host.
	 *
	 * connection_id is to be used in signaling the host.
	 */
	u16 is_dedicated_interrupt:1;
	u16 reserved1:15;
	u32 connection_id;
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} __packed;

/* Rescind Offer parameters */
struct vmbus_channel_rescind_offer {
	struct vmbus_channel_message_header header;
	u32 child_relid;
} __packed;

/*
 * Request Offer -- no parameters, SynIC message contains the partition ID
 * Set Snoop -- no parameters, SynIC message contains the partition ID
 * Clear Snoop -- no parameters, SynIC message contains the partition ID
 * All Offers Delivered -- no parameters, SynIC message contains the partition
 *		           ID
 * Flush Client -- no parameters, SynIC message contains the partition ID
 */

/* Open Channel parameters */
struct vmbus_channel_open_channel {
	struct vmbus_channel_message_header header;

	/* Identifies the specific VMBus channel that is being opened. */
	u32 child_relid;

	/* ID making a particular open request at a channel offer unique. */
	u32 openid;

	/* GPADL for the channel's ring buffer. */
	u32 ringbuffer_gpadlhandle;

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	/*
	 * Starting with win8, this field will be used to specify
	 * the target virtual processor on which to deliver the interrupt for
	 * the host to guest communication.
	 * Prior to win8, incoming channel interrupts would only
	 * be delivered on cpu 0. Setting this value to 0 would
	 * preserve the earlier behavior.
	 */
	u32 target_vp;
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	/*
	* The upstream ring buffer begins at offset zero in the memory
	* described by RingBufferGpadlHandle. The downstream ring buffer
	* follows it at this offset (in pages).
	*/
	u32 downstream_ringbuffer_pageoffset;

	/* User-specific data to be passed along to the server endpoint. */
	unsigned char userdata[MAX_USER_DEFINED_BYTES];
} __packed;

/* Open Channel Result parameters */
struct vmbus_channel_open_result {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 openid;
	u32 status;
} __packed;

/* Close channel parameters; */
struct vmbus_channel_close_channel {
	struct vmbus_channel_message_header header;
	u32 child_relid;
} __packed;

/* Channel Message GPADL */
#define GPADL_TYPE_RING_BUFFER		1
#define GPADL_TYPE_SERVER_SAVE_AREA	2
#define GPADL_TYPE_TRANSACTION		8

/*
 * The number of PFNs in a GPADL message is defined by the number of
 * pages that would be spanned by ByteCount and ByteOffset.  If the
 * implied number of PFNs won't fit in this packet, there will be a
 * follow-up packet that contains more.
 */
struct vmbus_channel_gpadl_header {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 gpadl;
	u16 range_buflen;
	u16 rangecount;
	struct gpa_range range[0];
} __packed;

/* This is the followup packet that contains more PFNs. */
struct vmbus_channel_gpadl_body {
	struct vmbus_channel_message_header header;
	u32 msgnumber;
	u32 gpadl;
	u64 pfn[0];
} __packed;

struct vmbus_channel_gpadl_created {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 gpadl;
	u32 creation_status;
} __packed;

struct vmbus_channel_gpadl_teardown {
	struct vmbus_channel_message_header header;
	u32 child_relid;
	u32 gpadl;
} __packed;

struct vmbus_channel_gpadl_torndown {
	struct vmbus_channel_message_header header;
	u32 gpadl;
} __packed;

struct vmbus_channel_relid_released {
	struct vmbus_channel_message_header header;
	u32 child_relid;
} __packed;

struct vmbus_channel_initiate_contact {
	struct vmbus_channel_message_header header;
	u32 vmbus_version_requested;
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	u32 target_vcpu; /* The VCPU the host should respond to */
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	u64 interrupt_page;
	u64 monitor_page1;
	u64 monitor_page2;
} __packed;

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/* Hyper-V socket: guest's connect()-ing to host */
struct vmbus_channel_tl_connect_request {
	struct vmbus_channel_message_header header;
	uuid_le guest_endpoint_id;
	uuid_le host_service_id;
} __packed;

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struct vmbus_channel_version_response {
	struct vmbus_channel_message_header header;
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	u8 version_supported;
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} __packed;

enum vmbus_channel_state {
	CHANNEL_OFFER_STATE,
	CHANNEL_OPENING_STATE,
	CHANNEL_OPEN_STATE,
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	CHANNEL_OPENED_STATE,
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};

/*
 * Represents each channel msg on the vmbus connection This is a
 * variable-size data structure depending on the msg type itself
 */
struct vmbus_channel_msginfo {
	/* Bookkeeping stuff */
	struct list_head msglistentry;

	/* So far, this is only used to handle gpadl body message */
	struct list_head submsglist;

	/* Synchronize the request/response if needed */
	struct completion  waitevent;
	union {
		struct vmbus_channel_version_supported version_supported;
		struct vmbus_channel_open_result open_result;
		struct vmbus_channel_gpadl_torndown gpadl_torndown;
		struct vmbus_channel_gpadl_created gpadl_created;
		struct vmbus_channel_version_response version_response;
	} response;

	u32 msgsize;
	/*
	 * The channel message that goes out on the "wire".
	 * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
	 */
	unsigned char msg[0];
};

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struct vmbus_close_msg {
	struct vmbus_channel_msginfo info;
	struct vmbus_channel_close_channel msg;
};

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/* Define connection identifier type. */
union hv_connection_id {
	u32 asu32;
	struct {
		u32 id:24;
		u32 reserved:8;
	} u;
};

/* Definition of the hv_signal_event hypercall input structure. */
struct hv_input_signal_event {
	union hv_connection_id connectionid;
	u16 flag_number;
	u16 rsvdz;
};

struct hv_input_signal_event_buffer {
	u64 align8;
	struct hv_input_signal_event event;
};

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enum hv_signal_policy {
	HV_SIGNAL_POLICY_DEFAULT = 0,
	HV_SIGNAL_POLICY_EXPLICIT,
};

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enum vmbus_device_type {
	HV_IDE = 0,
	HV_SCSI,
	HV_FC,
	HV_NIC,
	HV_ND,
	HV_PCIE,
	HV_FB,
	HV_KBD,
	HV_MOUSE,
	HV_KVP,
	HV_TS,
	HV_HB,
	HV_SHUTDOWN,
	HV_FCOPY,
	HV_BACKUP,
	HV_DM,
	HV_UNKOWN,
};

struct vmbus_device {
	u16  dev_type;
	uuid_le guid;
	bool perf_device;
};

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struct vmbus_channel {
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	/* Unique channel id */
	int id;

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	struct list_head listentry;

	struct hv_device *device_obj;

	enum vmbus_channel_state state;

	struct vmbus_channel_offer_channel offermsg;
	/*
	 * These are based on the OfferMsg.MonitorId.
	 * Save it here for easy access.
	 */
	u8 monitor_grp;
	u8 monitor_bit;

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	bool rescind; /* got rescind msg */

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	u32 ringbuffer_gpadlhandle;

	/* Allocated memory for ring buffer */
	void *ringbuffer_pages;
	u32 ringbuffer_pagecount;
	struct hv_ring_buffer_info outbound;	/* send to parent */
	struct hv_ring_buffer_info inbound;	/* receive from parent */
	spinlock_t inbound_lock;

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	struct vmbus_close_msg close_msg;

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	/* Channel callback are invoked in this workqueue context */
	/* HANDLE dataWorkQueue; */

	void (*onchannel_callback)(void *context);
	void *channel_callback_context;
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	/*
	 * A channel can be marked for efficient (batched)
	 * reading:
	 * If batched_reading is set to "true", we read until the
	 * channel is empty and hold off interrupts from the host
	 * during the entire read process.
	 * If batched_reading is set to "false", the client is not
	 * going to perform batched reading.
	 *
	 * By default we will enable batched reading; specific
	 * drivers that don't want this behavior can turn it off.
	 */

	bool batched_reading;
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	bool is_dedicated_interrupt;
	struct hv_input_signal_event_buffer sig_buf;
	struct hv_input_signal_event *sig_event;
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	/*
	 * Starting with win8, this field will be used to specify
	 * the target virtual processor on which to deliver the interrupt for
	 * the host to guest communication.
	 * Prior to win8, incoming channel interrupts would only
	 * be delivered on cpu 0. Setting this value to 0 would
	 * preserve the earlier behavior.
	 */
	u32 target_vp;
739 740
	/* The corresponding CPUID in the guest */
	u32 target_cpu;
741 742 743
	/*
	 * State to manage the CPU affiliation of channels.
	 */
744
	struct cpumask alloced_cpus_in_node;
745
	int numa_node;
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
	/*
	 * Support for sub-channels. For high performance devices,
	 * it will be useful to have multiple sub-channels to support
	 * a scalable communication infrastructure with the host.
	 * The support for sub-channels is implemented as an extention
	 * to the current infrastructure.
	 * The initial offer is considered the primary channel and this
	 * offer message will indicate if the host supports sub-channels.
	 * The guest is free to ask for sub-channels to be offerred and can
	 * open these sub-channels as a normal "primary" channel. However,
	 * all sub-channels will have the same type and instance guids as the
	 * primary channel. Requests sent on a given channel will result in a
	 * response on the same channel.
	 */

	/*
	 * Sub-channel creation callback. This callback will be called in
	 * process context when a sub-channel offer is received from the host.
	 * The guest can open the sub-channel in the context of this callback.
	 */
	void (*sc_creation_callback)(struct vmbus_channel *new_sc);

768 769 770 771 772 773
	/*
	 * Channel rescind callback. Some channels (the hvsock ones), need to
	 * register a callback which is invoked in vmbus_onoffer_rescind().
	 */
	void (*chn_rescind_callback)(struct vmbus_channel *channel);

774 775 776 777 778 779
	/*
	 * The spinlock to protect the structure. It is being used to protect
	 * test-and-set access to various attributes of the structure as well
	 * as all sc_list operations.
	 */
	spinlock_t lock;
780 781 782 783
	/*
	 * All Sub-channels of a primary channel are linked here.
	 */
	struct list_head sc_list;
784 785 786 787 788 789 790 791 792
	/*
	 * Current number of sub-channels.
	 */
	int num_sc;
	/*
	 * Number of a sub-channel (position within sc_list) which is supposed
	 * to be used as the next outgoing channel.
	 */
	int next_oc;
793 794 795 796 797
	/*
	 * The primary channel this sub-channel belongs to.
	 * This will be NULL for the primary channel.
	 */
	struct vmbus_channel *primary_channel;
798 799 800 801
	/*
	 * Support per-channel state for use by vmbus drivers.
	 */
	void *per_channel_state;
802 803 804 805 806
	/*
	 * To support per-cpu lookup mapping of relid to channel,
	 * link up channels based on their CPU affinity.
	 */
	struct list_head percpu_list;
807 808 809 810 811 812 813
	/*
	 * Host signaling policy: The default policy will be
	 * based on the ring buffer state. We will also support
	 * a policy where the client driver can have explicit
	 * signaling control.
	 */
	enum hv_signal_policy  signal_policy;
814 815 816 817 818 819 820 821 822 823 824
	/*
	 * On the channel send side, many of the VMBUS
	 * device drivers explicity serialize access to the
	 * outgoing ring buffer. Give more control to the
	 * VMBUS device drivers in terms how to serialize
	 * accesss to the outgoing ring buffer.
	 * The default behavior will be to aquire the
	 * ring lock to preserve the current behavior.
	 */
	bool acquire_ring_lock;

825
};
826

827 828 829 830 831
static inline void set_channel_lock_state(struct vmbus_channel *c, bool state)
{
	c->acquire_ring_lock = state;
}

832 833 834 835 836 837
static inline bool is_hvsock_channel(const struct vmbus_channel *c)
{
	return !!(c->offermsg.offer.chn_flags &
		  VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER);
}

838 839 840 841 842 843
static inline void set_channel_signal_state(struct vmbus_channel *c,
					    enum hv_signal_policy policy)
{
	c->signal_policy = policy;
}

844 845 846 847 848
static inline void set_channel_read_state(struct vmbus_channel *c, bool state)
{
	c->batched_reading = state;
}

849 850 851 852 853 854 855 856 857 858
static inline void set_per_channel_state(struct vmbus_channel *c, void *s)
{
	c->per_channel_state = s;
}

static inline void *get_per_channel_state(struct vmbus_channel *c)
{
	return c->per_channel_state;
}

859 860 861 862 863 864
static inline void set_channel_pending_send_size(struct vmbus_channel *c,
						 u32 size)
{
	c->outbound.ring_buffer->pending_send_sz = size;
}

865 866 867 868
void vmbus_onmessage(void *context);

int vmbus_request_offers(void);

869 870 871 872 873 874 875
/*
 * APIs for managing sub-channels.
 */

void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
			void (*sc_cr_cb)(struct vmbus_channel *new_sc));

876 877 878
void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
		void (*chn_rescind_cb)(struct vmbus_channel *));

879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899
/*
 * Retrieve the (sub) channel on which to send an outgoing request.
 * When a primary channel has multiple sub-channels, we choose a
 * channel whose VCPU binding is closest to the VCPU on which
 * this call is being made.
 */
struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary);

/*
 * Check if sub-channels have already been offerred. This API will be useful
 * when the driver is unloaded after establishing sub-channels. In this case,
 * when the driver is re-loaded, the driver would have to check if the
 * subchannels have already been established before attempting to request
 * the creation of sub-channels.
 * This function returns TRUE to indicate that subchannels have already been
 * created.
 * This function should be invoked after setting the callback function for
 * sub-channel creation.
 */
bool vmbus_are_subchannels_present(struct vmbus_channel *primary);

900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_channel_packet_page_buffer {
	u16 type;
	u16 dataoffset8;
	u16 length8;
	u16 flags;
	u64 transactionid;
	u32 reserved;
	u32 rangecount;
	struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
} __packed;

/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_channel_packet_multipage_buffer {
	u16 type;
	u16 dataoffset8;
	u16 length8;
	u16 flags;
	u64 transactionid;
	u32 reserved;
	u32 rangecount;		/* Always 1 in this case */
	struct hv_multipage_buffer range;
} __packed;

924 925 926 927 928 929 930 931 932 933 934 935
/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_packet_mpb_array {
	u16 type;
	u16 dataoffset8;
	u16 length8;
	u16 flags;
	u64 transactionid;
	u32 reserved;
	u32 rangecount;         /* Always 1 in this case */
	struct hv_mpb_array range;
} __packed;

936 937 938 939 940 941 942 943 944 945 946 947

extern int vmbus_open(struct vmbus_channel *channel,
			    u32 send_ringbuffersize,
			    u32 recv_ringbuffersize,
			    void *userdata,
			    u32 userdatalen,
			    void(*onchannel_callback)(void *context),
			    void *context);

extern void vmbus_close(struct vmbus_channel *channel);

extern int vmbus_sendpacket(struct vmbus_channel *channel,
948
				  void *buffer,
949 950 951 952 953
				  u32 bufferLen,
				  u64 requestid,
				  enum vmbus_packet_type type,
				  u32 flags);

954 955 956 957 958 959 960 961
extern int vmbus_sendpacket_ctl(struct vmbus_channel *channel,
				  void *buffer,
				  u32 bufferLen,
				  u64 requestid,
				  enum vmbus_packet_type type,
				  u32 flags,
				  bool kick_q);

962 963 964 965 966 967 968
extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
					    struct hv_page_buffer pagebuffers[],
					    u32 pagecount,
					    void *buffer,
					    u32 bufferlen,
					    u64 requestid);

969 970 971 972 973 974 975 976 977
extern int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
					   struct hv_page_buffer pagebuffers[],
					   u32 pagecount,
					   void *buffer,
					   u32 bufferlen,
					   u64 requestid,
					   u32 flags,
					   bool kick_q);

978 979 980 981 982 983
extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
					struct hv_multipage_buffer *mpb,
					void *buffer,
					u32 bufferlen,
					u64 requestid);

984 985 986 987 988 989 990
extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
				     struct vmbus_packet_mpb_array *mpb,
				     u32 desc_size,
				     void *buffer,
				     u32 bufferlen,
				     u64 requestid);

991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013
extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
				      void *kbuffer,
				      u32 size,
				      u32 *gpadl_handle);

extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
				     u32 gpadl_handle);

extern int vmbus_recvpacket(struct vmbus_channel *channel,
				  void *buffer,
				  u32 bufferlen,
				  u32 *buffer_actual_len,
				  u64 *requestid);

extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
				     void *buffer,
				     u32 bufferlen,
				     u32 *buffer_actual_len,
				     u64 *requestid);


extern void vmbus_ontimer(unsigned long data);

1014 1015 1016 1017
/* Base driver object */
struct hv_driver {
	const char *name;

1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
	/*
	 * A hvsock offer, which has a VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER
	 * channel flag, actually doesn't mean a synthetic device because the
	 * offer's if_type/if_instance can change for every new hvsock
	 * connection.
	 *
	 * However, to facilitate the notification of new-offer/rescind-offer
	 * from vmbus driver to hvsock driver, we can handle hvsock offer as
	 * a special vmbus device, and hence we need the below flag to
	 * indicate if the driver is the hvsock driver or not: we need to
	 * specially treat the hvosck offer & driver in vmbus_match().
	 */
	bool hvsock;

1032
	/* the device type supported by this driver */
1033
	uuid_le dev_type;
1034
	const struct hv_vmbus_device_id *id_table;
1035 1036 1037

	struct device_driver driver;

1038
	int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
1039 1040 1041 1042 1043 1044 1045 1046
	int (*remove)(struct hv_device *);
	void (*shutdown)(struct hv_device *);

};

/* Base device object */
struct hv_device {
	/* the device type id of this device */
1047
	uuid_le dev_type;
1048 1049

	/* the device instance id of this device */
1050
	uuid_le dev_instance;
1051 1052
	u16 vendor_id;
	u16 device_id;
1053 1054 1055 1056 1057 1058

	struct device device;

	struct vmbus_channel *channel;
};

1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069

static inline struct hv_device *device_to_hv_device(struct device *d)
{
	return container_of(d, struct hv_device, device);
}

static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
{
	return container_of(d, struct hv_driver, driver);
}

1070 1071 1072 1073 1074 1075 1076 1077 1078
static inline void hv_set_drvdata(struct hv_device *dev, void *data)
{
	dev_set_drvdata(&dev->device, data);
}

static inline void *hv_get_drvdata(struct hv_device *dev)
{
	return dev_get_drvdata(&dev->device);
}
1079 1080

/* Vmbus interface */
1081 1082 1083 1084 1085 1086
#define vmbus_driver_register(driver)	\
	__vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
					 struct module *owner,
					 const char *mod_name);
void vmbus_driver_unregister(struct hv_driver *hv_driver);
1087

1088 1089
void vmbus_hvsock_device_unregister(struct vmbus_channel *channel);

1090 1091 1092 1093 1094
int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
			resource_size_t min, resource_size_t max,
			resource_size_t size, resource_size_t align,
			bool fb_overlap_ok);

1095
int vmbus_cpu_number_to_vp_number(int cpu_number);
1096
u64 hv_do_hypercall(u64 control, void *input, void *output);
1097

1098 1099 1100 1101 1102 1103 1104 1105 1106
/*
 * GUID definitions of various offer types - services offered to the guest.
 */

/*
 * Network GUID
 * {f8615163-df3e-46c5-913f-f2d2f965ed0e}
 */
#define HV_NIC_GUID \
1107 1108
	.guid = UUID_LE(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \
			0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e)
1109 1110 1111 1112 1113 1114

/*
 * IDE GUID
 * {32412632-86cb-44a2-9b5c-50d1417354f5}
 */
#define HV_IDE_GUID \
1115 1116
	.guid = UUID_LE(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \
			0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
1117 1118 1119 1120 1121 1122

/*
 * SCSI GUID
 * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
 */
#define HV_SCSI_GUID \
1123 1124
	.guid = UUID_LE(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \
			0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
1125 1126 1127 1128 1129 1130

/*
 * Shutdown GUID
 * {0e0b6031-5213-4934-818b-38d90ced39db}
 */
#define HV_SHUTDOWN_GUID \
1131 1132
	.guid = UUID_LE(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \
			0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb)
1133 1134 1135 1136 1137 1138

/*
 * Time Synch GUID
 * {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
 */
#define HV_TS_GUID \
1139 1140
	.guid = UUID_LE(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \
			0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
1141 1142 1143 1144 1145 1146

/*
 * Heartbeat GUID
 * {57164f39-9115-4e78-ab55-382f3bd5422d}
 */
#define HV_HEART_BEAT_GUID \
1147 1148
	.guid = UUID_LE(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \
			0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
1149 1150 1151 1152 1153 1154

/*
 * KVP GUID
 * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
 */
#define HV_KVP_GUID \
1155 1156
	.guid = UUID_LE(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \
			0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6)
1157 1158 1159 1160 1161 1162

/*
 * Dynamic memory GUID
 * {525074dc-8985-46e2-8057-a307dc18a502}
 */
#define HV_DM_GUID \
1163 1164
	.guid = UUID_LE(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \
			0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02)
1165 1166 1167 1168 1169 1170

/*
 * Mouse GUID
 * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
 */
#define HV_MOUSE_GUID \
1171 1172
	.guid = UUID_LE(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \
			0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a)
1173

1174 1175 1176 1177 1178 1179 1180 1181
/*
 * Keyboard GUID
 * {f912ad6d-2b17-48ea-bd65-f927a61c7684}
 */
#define HV_KBD_GUID \
	.guid = UUID_LE(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \
			0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84)

1182 1183 1184 1185
/*
 * VSS (Backup/Restore) GUID
 */
#define HV_VSS_GUID \
1186 1187
	.guid = UUID_LE(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \
			0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40)
1188 1189 1190 1191 1192
/*
 * Synthetic Video GUID
 * {DA0A7802-E377-4aac-8E77-0558EB1073F8}
 */
#define HV_SYNTHVID_GUID \
1193 1194
	.guid = UUID_LE(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \
			0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8)
1195

1196 1197 1198 1199 1200
/*
 * Synthetic FC GUID
 * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
 */
#define HV_SYNTHFC_GUID \
1201 1202
	.guid = UUID_LE(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \
			0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda)
1203

1204 1205 1206 1207 1208 1209
/*
 * Guest File Copy Service
 * {34D14BE3-DEE4-41c8-9AE7-6B174977C192}
 */

#define HV_FCOPY_GUID \
1210 1211
	.guid = UUID_LE(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \
			0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92)
1212

1213 1214 1215 1216 1217
/*
 * NetworkDirect. This is the guest RDMA service.
 * {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501}
 */
#define HV_ND_GUID \
1218 1219
	.guid = UUID_LE(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \
			0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01)
1220

1221 1222 1223 1224 1225 1226
/*
 * PCI Express Pass Through
 * {44C4F61D-4444-4400-9D52-802E27EDE19F}
 */

#define HV_PCIE_GUID \
1227 1228
	.guid = UUID_LE(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \
			0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)
1229

1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245
/*
 * Common header for Hyper-V ICs
 */

#define ICMSGTYPE_NEGOTIATE		0
#define ICMSGTYPE_HEARTBEAT		1
#define ICMSGTYPE_KVPEXCHANGE		2
#define ICMSGTYPE_SHUTDOWN		3
#define ICMSGTYPE_TIMESYNC		4
#define ICMSGTYPE_VSS			5

#define ICMSGHDRFLAG_TRANSACTION	1
#define ICMSGHDRFLAG_REQUEST		2
#define ICMSGHDRFLAG_RESPONSE		4


1246 1247 1248 1249 1250 1251 1252 1253
/*
 * While we want to handle util services as regular devices,
 * there is only one instance of each of these services; so
 * we statically allocate the service specific state.
 */

struct hv_util_service {
	u8 *recv_buffer;
1254
	void *channel;
1255 1256 1257 1258 1259
	void (*util_cb)(void *);
	int (*util_init)(struct hv_util_service *);
	void (*util_deinit)(void);
};

1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320
struct vmbuspipe_hdr {
	u32 flags;
	u32 msgsize;
} __packed;

struct ic_version {
	u16 major;
	u16 minor;
} __packed;

struct icmsg_hdr {
	struct ic_version icverframe;
	u16 icmsgtype;
	struct ic_version icvermsg;
	u16 icmsgsize;
	u32 status;
	u8 ictransaction_id;
	u8 icflags;
	u8 reserved[2];
} __packed;

struct icmsg_negotiate {
	u16 icframe_vercnt;
	u16 icmsg_vercnt;
	u32 reserved;
	struct ic_version icversion_data[1]; /* any size array */
} __packed;

struct shutdown_msg_data {
	u32 reason_code;
	u32 timeout_seconds;
	u32 flags;
	u8  display_message[2048];
} __packed;

struct heartbeat_msg_data {
	u64 seq_num;
	u32 reserved[8];
} __packed;

/* Time Sync IC defs */
#define ICTIMESYNCFLAG_PROBE	0
#define ICTIMESYNCFLAG_SYNC	1
#define ICTIMESYNCFLAG_SAMPLE	2

#ifdef __x86_64__
#define WLTIMEDELTA	116444736000000000L	/* in 100ns unit */
#else
#define WLTIMEDELTA	116444736000000000LL
#endif

struct ictimesync_data {
	u64 parenttime;
	u64 childtime;
	u64 roundtriptime;
	u8 flags;
} __packed;

struct hyperv_service_callback {
	u8 msg_type;
	char *log_msg;
1321
	uuid_le data;
1322 1323 1324 1325
	struct vmbus_channel *channel;
	void (*callback) (void *context);
};

1326
#define MAX_SRV_VER	0x7ffffff
1327
extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *,
1328 1329
					struct icmsg_negotiate *, u8 *, int,
					int);
1330

1331
void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid);
1332

1333 1334 1335 1336 1337 1338
/*
 * Negotiated version with the Host.
 */

extern __u32 vmbus_proto_version;

1339 1340
int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id,
				  const uuid_le *shv_host_servie_id);
1341
#endif /* _HYPERV_H */