/*
   *
   * 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>
   *
   */

  
  #ifndef _HYPERV_H
  #define _HYPERV_H

  #include <uapi/linux/hyperv.h>

  #include <uapi/asm/hyperv.h>

  #include <linux/types.h>

  #include <linux/scatterlist.h>
  #include <linux/list.h>
  #include <linux/timer.h>
  #include <linux/workqueue.h>
  #include <linux/completion.h>
  #include <linux/device.h>

  #include <linux/mod_devicetable.h>

  #define MAX_PAGE_BUFFER_COUNT				32

  #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];
  };

  /*
   * 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[];
  };

  /* 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)

  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;

  	/*
  	 * 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.

  	 */

  	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];

  
  	/*
  	 * 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;

  	u32 priv_write_index;
  	u32 priv_read_index;

  };

  /*
   *
   * 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;
  }

  static inline u32 hv_get_bytes_to_read(struct hv_ring_buffer_info *rbi)
  {
  	u32 read_loc, write_loc, dsize, read;
  
  	dsize = rbi->ring_datasize;
  	read_loc = rbi->ring_buffer->read_index;
  	write_loc = READ_ONCE(rbi->ring_buffer->write_index);
  
  	read = write_loc >= read_loc ? (write_loc - read_loc) :
  		(dsize - read_loc) + write_loc;
  
  	return read;
  }
  
  static inline u32 hv_get_bytes_to_write(struct hv_ring_buffer_info *rbi)
  {
  	u32 read_loc, write_loc, dsize, write;
  
  	dsize = rbi->ring_datasize;
  	read_loc = READ_ONCE(rbi->ring_buffer->read_index);
  	write_loc = rbi->ring_buffer->write_index;
  
  	write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
  		read_loc - write_loc;
  	return write;
  }

  /*
   * 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)

   * 3 . 0  (Windows 8 R2)

   * 4 . 0  (Windows 10)

   */
  
  #define VERSION_WS2008  ((0 << 16) | (13))
  #define VERSION_WIN7    ((1 << 16) | (1))
  #define VERSION_WIN8    ((2 << 16) | (4))

  #define VERSION_WIN8_1    ((3 << 16) | (0))

  #define VERSION_WIN10	((4 << 16) | (0))

  
  #define VERSION_INVAL -1

  #define VERSION_CURRENT VERSION_WIN10

  /* 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 {

  	uuid_le if_type;
  	uuid_le if_instance;

  
  	/*
  	 * These two fields are not currently used.
  	 */
  	u64 reserved1;
  	u64 reserved2;

  	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;

  	/*
  	 * The sub_channel_index is defined in win8.
  	 */
  	u16 sub_channel_index;
  	u16 reserved3;

  } __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

  #define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER		0x2000

  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;

  	u8  sender_owns_set;

  	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

  /* 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,

  	CHANNELMSG_UNLOAD_RESPONSE		= 17,

  	CHANNELMSG_18				= 18,
  	CHANNELMSG_19				= 19,
  	CHANNELMSG_20				= 20,
  	CHANNELMSG_TL_CONNECT_REQUEST		= 21,

  	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;

  	u8 version_supported;

  } __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;

  	/*
  	 * 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;

  } __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;

  	/*
  	 * 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;

  
  	/*
  	* 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;

  	u32 target_vcpu; /* The VCPU the host should respond to */

  	u64 interrupt_page;
  	u64 monitor_page1;
  	u64 monitor_page2;
  } __packed;

  /* 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;

  struct vmbus_channel_version_response {
  	struct vmbus_channel_message_header header;

  	u8 version_supported;

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

  	CHANNEL_OPENED_STATE,

  };

  /*
   * 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];
  };

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

  /* 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;
  };

  enum hv_signal_policy {
  	HV_SIGNAL_POLICY_DEFAULT = 0,
  	HV_SIGNAL_POLICY_EXPLICIT,
  };

  enum hv_numa_policy {
  	HV_BALANCED = 0,
  	HV_LOCALIZED,
  };

  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;
  };

  struct vmbus_channel {
  	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;

  	bool rescind; /* got rescind msg */

  	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;

  	struct vmbus_close_msg close_msg;

  	/* Channel callback are invoked in this workqueue context */
  	/* HANDLE dataWorkQueue; */
  
  	void (*onchannel_callback)(void *context);
  	void *channel_callback_context;

  
  	/*
  	 * 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;

  
  	bool is_dedicated_interrupt;
  	struct hv_input_signal_event_buffer sig_buf;
  	struct hv_input_signal_event *sig_event;

  
  	/*
  	 * 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;

  	/* The corresponding CPUID in the guest */
  	u32 target_cpu;

  	/*

  	 * State to manage the CPU affiliation of channels.
  	 */

  	struct cpumask alloced_cpus_in_node;

  	int numa_node;
  	/*

  	 * 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);

  	/*

  	 * 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);
  
  	/*

  	 * 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;

  	/*
  	 * All Sub-channels of a primary channel are linked here.
  	 */
  	struct list_head sc_list;
  	/*

  	 * 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;
  	/*

  	 * The primary channel this sub-channel belongs to.
  	 * This will be NULL for the primary channel.
  	 */
  	struct vmbus_channel *primary_channel;

  	/*
  	 * Support per-channel state for use by vmbus drivers.
  	 */
  	void *per_channel_state;

  	/*
  	 * To support per-cpu lookup mapping of relid to channel,
  	 * link up channels based on their CPU affinity.
  	 */
  	struct list_head percpu_list;

  	/*
  	 * 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;

  	/*
  	 * 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;

  	/*
  	 * For performance critical channels (storage, networking
  	 * etc,), Hyper-V has a mechanism to enhance the throughput
  	 * at the expense of latency:
  	 * When the host is to be signaled, we just set a bit in a shared page
  	 * and this bit will be inspected by the hypervisor within a certain
  	 * window and if the bit is set, the host will be signaled. The window
  	 * of time is the monitor latency - currently around 100 usecs. This
  	 * mechanism improves throughput by:
  	 *
  	 * A) Making the host more efficient - each time it wakes up,
  	 *    potentially it will process morev number of packets. The
  	 *    monitor latency allows a batch to build up.
  	 * B) By deferring the hypercall to signal, we will also minimize
  	 *    the interrupts.
  	 *
  	 * Clearly, these optimizations improve throughput at the expense of
  	 * latency. Furthermore, since the channel is shared for both
  	 * control and data messages, control messages currently suffer
  	 * unnecessary latency adversley impacting performance and boot
  	 * time. To fix this issue, permit tagging the channel as being
  	 * in "low latency" mode. In this mode, we will bypass the monitor
  	 * mechanism.
  	 */
  	bool low_latency;

  	/*
  	 * NUMA distribution policy:
  	 * We support teo policies:
  	 * 1) Balanced: Here all performance critical channels are
  	 *    distributed evenly amongst all the NUMA nodes.
  	 *    This policy will be the default policy.
  	 * 2) Localized: All channels of a given instance of a
  	 *    performance critical service will be assigned CPUs
  	 *    within a selected NUMA node.
  	 */
  	enum hv_numa_policy affinity_policy;

  };

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

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

  static inline void set_channel_signal_state(struct vmbus_channel *c,
  					    enum hv_signal_policy policy)
  {
  	c->signal_policy = policy;
  }

  static inline void set_channel_affinity_state(struct vmbus_channel *c,
  					      enum hv_numa_policy policy)
  {
  	c->affinity_policy = policy;
  }

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

  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;
  }

  static inline void set_channel_pending_send_size(struct vmbus_channel *c,
  						 u32 size)
  {
  	c->outbound.ring_buffer->pending_send_sz = size;
  }

  static inline void set_low_latency_mode(struct vmbus_channel *c)
  {
  	c->low_latency = true;
  }
  
  static inline void clear_low_latency_mode(struct vmbus_channel *c)
  {
  	c->low_latency = false;
  }

  void vmbus_onmessage(void *context);
  
  int vmbus_request_offers(void);

  /*
   * 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));

  void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
  		void (*chn_rescind_cb)(struct vmbus_channel *));

  /*
   * 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);

  /* 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;

  /* 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;

  
  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,

  				  void *buffer,

  				  u32 bufferLen,
  				  u64 requestid,
  				  enum vmbus_packet_type type,
  				  u32 flags);

  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);

  extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
  					    struct hv_page_buffer pagebuffers[],
  					    u32 pagecount,
  					    void *buffer,
  					    u32 bufferlen,
  					    u64 requestid);

  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);

  extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
  					struct hv_multipage_buffer *mpb,
  					void *buffer,
  					u32 bufferlen,
  					u64 requestid);

  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);

  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);

  /* Base driver object */
  struct hv_driver {
  	const char *name;

  	/*
  	 * 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;

  	/* the device type supported by this driver */

  	uuid_le dev_type;

  	const struct hv_vmbus_device_id *id_table;

  
  	struct device_driver driver;

  	int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);

  	int (*remove)(struct hv_device *);
  	void (*shutdown)(struct hv_device *);
  
  };
  
  /* Base device object */
  struct hv_device {
  	/* the device type id of this device */

  	uuid_le dev_type;

  
  	/* the device instance id of this device */

  	uuid_le dev_instance;

  	u16 vendor_id;
  	u16 device_id;

  
  	struct device device;
  
  	struct vmbus_channel *channel;

  };

  
  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);
  }

  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);
  }

  
  /* Vmbus interface */

  #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);

  void vmbus_hvsock_device_unregister(struct vmbus_channel *channel);

  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);

  void vmbus_free_mmio(resource_size_t start, resource_size_t size);

  int vmbus_cpu_number_to_vp_number(int cpu_number);

  u64 hv_do_hypercall(u64 control, void *input, void *output);

  /*

   * GUID definitions of various offer types - services offered to the guest.
   */
  
  /*
   * Network GUID
   * {f8615163-df3e-46c5-913f-f2d2f965ed0e}
   */
  #define HV_NIC_GUID \

  	.guid = UUID_LE(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \
  			0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e)

  
  /*
   * IDE GUID
   * {32412632-86cb-44a2-9b5c-50d1417354f5}
   */
  #define HV_IDE_GUID \

  	.guid = UUID_LE(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \
  			0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)

  
  /*
   * SCSI GUID
   * {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
   */
  #define HV_SCSI_GUID \

  	.guid = UUID_LE(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \
  			0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)

  
  /*
   * Shutdown GUID
   * {0e0b6031-5213-4934-818b-38d90ced39db}
   */
  #define HV_SHUTDOWN_GUID \

  	.guid = UUID_LE(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \
  			0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb)

  
  /*
   * Time Synch GUID
   * {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
   */
  #define HV_TS_GUID \

  	.guid = UUID_LE(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \
  			0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)

  
  /*
   * Heartbeat GUID
   * {57164f39-9115-4e78-ab55-382f3bd5422d}
   */
  #define HV_HEART_BEAT_GUID \

  	.guid = UUID_LE(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \
  			0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)

  
  /*
   * KVP GUID
   * {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
   */
  #define HV_KVP_GUID \

  	.guid = UUID_LE(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \
  			0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6)

  
  /*
   * Dynamic memory GUID
   * {525074dc-8985-46e2-8057-a307dc18a502}
   */
  #define HV_DM_GUID \

  	.guid = UUID_LE(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \
  			0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02)

  
  /*
   * Mouse GUID
   * {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
   */
  #define HV_MOUSE_GUID \

  	.guid = UUID_LE(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \
  			0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a)

  
  /*

   * 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)
  
  /*

   * VSS (Backup/Restore) GUID
   */
  #define HV_VSS_GUID \

  	.guid = UUID_LE(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \
  			0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40)

  /*

   * Synthetic Video GUID
   * {DA0A7802-E377-4aac-8E77-0558EB1073F8}
   */
  #define HV_SYNTHVID_GUID \

  	.guid = UUID_LE(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \
  			0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8)

  /*

   * Synthetic FC GUID
   * {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
   */
  #define HV_SYNTHFC_GUID \

  	.guid = UUID_LE(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \
  			0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda)

  
  /*

   * Guest File Copy Service
   * {34D14BE3-DEE4-41c8-9AE7-6B174977C192}
   */
  
  #define HV_FCOPY_GUID \

  	.guid = UUID_LE(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \
  			0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92)

  
  /*

   * NetworkDirect. This is the guest RDMA service.
   * {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501}
   */
  #define HV_ND_GUID \

  	.guid = UUID_LE(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \
  			0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01)

  
  /*

   * PCI Express Pass Through
   * {44C4F61D-4444-4400-9D52-802E27EDE19F}
   */
  
  #define HV_PCIE_GUID \

  	.guid = UUID_LE(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \
  			0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)

  
  /*

   * Linux doesn't support the 3 devices: the first two are for
   * Automatic Virtual Machine Activation, and the third is for
   * Remote Desktop Virtualization.
   * {f8e65716-3cb3-4a06-9a60-1889c5cccab5}
   * {3375baf4-9e15-4b30-b765-67acb10d607b}
   * {276aacf4-ac15-426c-98dd-7521ad3f01fe}
   */
  
  #define HV_AVMA1_GUID \
  	.guid = UUID_LE(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \
  			0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5)
  
  #define HV_AVMA2_GUID \
  	.guid = UUID_LE(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \
  			0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b)
  
  #define HV_RDV_GUID \
  	.guid = UUID_LE(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \
  			0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)
  
  /*

   * 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

  /*
   * 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;

  	void *channel;

  	void (*util_cb)(void *);
  	int (*util_init)(struct hv_util_service *);
  	void (*util_deinit)(void);
  };

  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 ictimesync_ref_data {
  	u64 parenttime;
  	u64 vmreferencetime;
  	u8 flags;
  	char leapflags;
  	char stratum;
  	u8 reserved[3];
  } __packed;

  struct hyperv_service_callback {
  	u8 msg_type;
  	char *log_msg;

  	uuid_le data;

  	struct vmbus_channel *channel;
  	void (*callback) (void *context);
  };

  #define MAX_SRV_VER	0x7ffffff

  extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *,

  					struct icmsg_negotiate *, u8 *, int,
  					int);

  void hv_event_tasklet_disable(struct vmbus_channel *channel);
  void hv_event_tasklet_enable(struct vmbus_channel *channel);

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

  /*
   * Negotiated version with the Host.
   */
  
  extern __u32 vmbus_proto_version;

  int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id,
  				  const uuid_le *shv_host_servie_id);

  void vmbus_set_event(struct vmbus_channel *channel);

  
  /* Get the start of the ring buffer. */
  static inline void *
  hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
  {
  	return (void *)ring_info->ring_buffer->buffer;
  }
  
  /*
   * To optimize the flow management on the send-side,
   * when the sender is blocked because of lack of
   * sufficient space in the ring buffer, potential the
   * consumer of the ring buffer can signal the producer.
   * This is controlled by the following parameters:
   *
   * 1. pending_send_sz: This is the size in bytes that the
   *    producer is trying to send.
   * 2. The feature bit feat_pending_send_sz set to indicate if
   *    the consumer of the ring will signal when the ring
   *    state transitions from being full to a state where
   *    there is room for the producer to send the pending packet.
   */
  
  static inline  bool hv_need_to_signal_on_read(struct hv_ring_buffer_info *rbi)
  {
  	u32 cur_write_sz;
  	u32 pending_sz;
  
  	/*
  	 * Issue a full memory barrier before making the signaling decision.
  	 * Here is the reason for having this barrier:
  	 * If the reading of the pend_sz (in this function)
  	 * were to be reordered and read before we commit the new read
  	 * index (in the calling function)  we could
  	 * have a problem. If the host were to set the pending_sz after we
  	 * have sampled pending_sz and go to sleep before we commit the
  	 * read index, we could miss sending the interrupt. Issue a full
  	 * memory barrier to address this.
  	 */
  	virt_mb();
  
  	pending_sz = READ_ONCE(rbi->ring_buffer->pending_send_sz);
  	/* If the other end is not blocked on write don't bother. */
  	if (pending_sz == 0)
  		return false;
  
  	cur_write_sz = hv_get_bytes_to_write(rbi);
  
  	if (cur_write_sz >= pending_sz)
  		return true;
  
  	return false;
  }

  /*
   * An API to support in-place processing of incoming VMBUS packets.
   */
  #define VMBUS_PKT_TRAILER	8
  
  static inline struct vmpacket_descriptor *
  get_next_pkt_raw(struct vmbus_channel *channel)
  {
  	struct hv_ring_buffer_info *ring_info = &channel->inbound;

  	u32 read_loc = ring_info->priv_read_index;

  	void *ring_buffer = hv_get_ring_buffer(ring_info);

  	struct vmpacket_descriptor *cur_desc;
  	u32 packetlen;

  	u32 dsize = ring_info->ring_datasize;

  	u32 delta = read_loc - ring_info->ring_buffer->read_index;

  	u32 bytes_avail_toread = (hv_get_bytes_to_read(ring_info) - delta);
  
  	if (bytes_avail_toread < sizeof(struct vmpacket_descriptor))
  		return NULL;

  	if ((read_loc + sizeof(*cur_desc)) > dsize)
  		return NULL;
  
  	cur_desc = ring_buffer + read_loc;
  	packetlen = cur_desc->len8 << 3;
  
  	/*
  	 * If the packet under consideration is wrapping around,
  	 * return failure.
  	 */
  	if ((read_loc + packetlen + VMBUS_PKT_TRAILER) > (dsize - 1))
  		return NULL;
  
  	return cur_desc;

  }
  
  /*
   * A helper function to step through packets "in-place"
   * This API is to be called after each successful call
   * get_next_pkt_raw().
   */
  static inline void put_pkt_raw(struct vmbus_channel *channel,
  				struct vmpacket_descriptor *desc)
  {
  	struct hv_ring_buffer_info *ring_info = &channel->inbound;

  	u32 read_loc = ring_info->priv_read_index;

  	u32 packetlen = desc->len8 << 3;
  	u32 dsize = ring_info->ring_datasize;

  	if ((read_loc + packetlen + VMBUS_PKT_TRAILER) > dsize)
  		BUG();

  	/*
  	 * Include the packet trailer.
  	 */
  	ring_info->priv_read_index += packetlen + VMBUS_PKT_TRAILER;
  }
  
  /*
   * This call commits the read index and potentially signals the host.
   * Here is the pattern for using the "in-place" consumption APIs:
   *
   * while (get_next_pkt_raw() {
   *	process the packet "in-place";
   *	put_pkt_raw();
   * }
   * if (packets processed in place)
   *	commit_rd_index();
   */
  static inline void commit_rd_index(struct vmbus_channel *channel)
  {
  	struct hv_ring_buffer_info *ring_info = &channel->inbound;
  	/*
  	 * Make sure all reads are done before we update the read index since
  	 * the writer may start writing to the read area once the read index
  	 * is updated.
  	 */
  	virt_rmb();
  	ring_info->ring_buffer->read_index = ring_info->priv_read_index;
  
  	if (hv_need_to_signal_on_read(ring_info))
  		vmbus_set_event(channel);
  }

  #endif /* _HYPERV_H */