Staging: hv: move hyperv code out of staging directory

After many years wandering the desert, it is finally time for the
Microsoft HyperV code to move out of the staging directory.  Or at least
the core hyperv bus code, and the utility driver, the rest still have
some review to get through by the various subsystem maintainers.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>

1 files changed, 969 insertions, 0 deletions

diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
new file mode 100644
index 000000000000..edaa9e2f58ec
--- /dev/null
+++ b/include/linux/hyperv.h
@@ -0,0 +1,969 @@
+/*
+ *
+ * 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 <linux/scatterlist.h>
+#include <linux/list.h>
+#include <linux/uuid.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/mod_devicetable.h>
+
+
+#include <asm/hyperv.h>
+
+
+#define MAX_PAGE_BUFFER_COUNT                           16
+#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];
+};
+
+/* 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;
+
+        /* Pad it to PAGE_SIZE so that data starts on page boundary */
+        u8      reserved[4084];
+
+        /* NOTE:
+         * The interrupt_mask field is used only for channels but since our
+         * vmbus connection also uses this data structure and its data starts
+         * here, we commented out this field.
+         */
+
+        /*
+         * 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;
+};
+
+struct hv_ring_buffer_debug_info {
+        u32 current_interrupt_mask;
+        u32 current_read_index;
+        u32 current_write_index;
+        u32 bytes_avail_toread;
+        u32 bytes_avail_towrite;
+};
+
+/*
+ * We use the same version numbering for all Hyper-V modules.
+ *
+ * Definition of versioning is as follows;
+ *
+ *      Major Number    Changes for these scenarios;
+ *                      1.      When a new version of Windows Hyper-V
+ *                              is released.
+ *                      2.      A Major change has occurred in the
+ *                              Linux IC's.
+ *                      (For example the merge for the first time
+ *                      into the kernel) Every time the Major Number
+ *                      changes, the Revision number is reset to 0.
+ *      Minor Number    Changes when new functionality is added
+ *                      to the Linux IC's that is not a bug fix.
+ *
+ * 3.1 - Added completed hv_utils driver. Shutdown/Heartbeat/Timesync
+ */
+#define HV_DRV_VERSION           "3.1"
+
+
+/*
+ * A revision number of vmbus that is used for ensuring both ends on a
+ * partition are using compatible versions.
+ */
+#define VMBUS_REVISION_NUMBER           13
+
+/* 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;
+        u64 int_latency; /* in 100ns units */
+        u32 if_revision;
+        u32 server_ctx_size;    /* in bytes */
+        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;
+        u32 padding;
+} __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
+
+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;
+        bool 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,
+#ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
+        CHANNELMSG_VIEWRANGE_ADD                = 17,
+        CHANNELMSG_VIEWRANGE_REMOVE             = 18,
+#endif
+        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;
+        bool 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;
+        bool monitor_allocated;
+} __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;
+
+        /* GPADL for the channel's server context save area. */
+        u32 server_contextarea_gpadlhandle;
+
+        /*
+        * 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;
+
+#ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
+struct vmbus_channel_view_range_add {
+        struct vmbus_channel_message_header header;
+        PHYSICAL_ADDRESS viewrange_base;
+        u64 viewrange_length;
+        u32 child_relid;
+} __packed;
+
+struct vmbus_channel_view_range_remove {
+        struct vmbus_channel_message_header header;
+        PHYSICAL_ADDRESS viewrange_base;
+        u32 child_relid;
+} __packed;
+#endif
+
+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 padding2;
+        u64 interrupt_page;
+        u64 monitor_page1;
+        u64 monitor_page2;
+} __packed;
+
+struct vmbus_channel_version_response {
+        struct vmbus_channel_message_header header;
+        bool version_supported;
+} __packed;
+
+enum vmbus_channel_state {
+        CHANNEL_OFFER_STATE,
+        CHANNEL_OPENING_STATE,
+        CHANNEL_OPEN_STATE,
+};
+
+struct vmbus_channel_debug_info {
+        u32 relid;
+        enum vmbus_channel_state state;
+        uuid_le interfacetype;
+        uuid_le interface_instance;
+        u32 monitorid;
+        u32 servermonitor_pending;
+        u32 servermonitor_latency;
+        u32 servermonitor_connectionid;
+        u32 clientmonitor_pending;
+        u32 clientmonitor_latency;
+        u32 clientmonitor_connectionid;
+
+        struct hv_ring_buffer_debug_info inbound;
+        struct hv_ring_buffer_debug_info outbound;
+};
+
+/*
+ * 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;
+};
+
+struct vmbus_channel {
+        struct list_head listentry;
+
+        struct hv_device *device_obj;
+
+        struct work_struct work;
+
+        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;
+
+        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 workqueue_struct *controlwq;
+
+        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;
+};
+
+void free_channel(struct vmbus_channel *channel);
+
+void vmbus_onmessage(void *context);
+
+int vmbus_request_offers(void);
+
+/* 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;
+
+
+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,
+                                  const void *buffer,
+                                  u32 bufferLen,
+                                  u64 requestid,
+                                  enum vmbus_packet_type type,
+                                  u32 flags);
+
+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_multipagebuffer(struct vmbus_channel *channel,
+                                        struct hv_multipage_buffer *mpb,
+                                        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_get_debug_info(struct vmbus_channel *channel,
+                                     struct vmbus_channel_debug_info *debug);
+
+extern void vmbus_ontimer(unsigned long data);
+
+
+#define LOWORD(dw) ((unsigned short)(dw))
+#define HIWORD(dw) ((unsigned short)(((unsigned int) (dw) >> 16) & 0xFFFF))
+
+
+#define VMBUS                           0x0001
+#define STORVSC                         0x0002
+#define NETVSC                          0x0004
+#define INPUTVSC                        0x0008
+#define BLKVSC                          0x0010
+#define VMBUS_DRV                       0x0100
+#define STORVSC_DRV                     0x0200
+#define NETVSC_DRV                      0x0400
+#define INPUTVSC_DRV            0x0800
+#define BLKVSC_DRV                      0x1000
+
+#define ALL_MODULES                     (VMBUS          |\
+                                                        STORVSC         |\
+                                                        NETVSC          |\
+                                                        INPUTVSC        |\
+                                                        BLKVSC          |\
+                                                        VMBUS_DRV       |\
+                                                        STORVSC_DRV     |\
+                                                        NETVSC_DRV      |\
+                                                        INPUTVSC_DRV|\
+                                                        BLKVSC_DRV)
+
+/* Logging Level */
+#define ERROR_LVL                               3
+#define WARNING_LVL                             4
+#define INFO_LVL                                6
+#define DEBUG_LVL                               7
+#define DEBUG_LVL_ENTEREXIT                     8
+#define DEBUG_RING_LVL                          9
+
+extern unsigned int vmbus_loglevel;
+
+#define DPRINT(mod, lvl, fmt, args...) do {\
+        if ((mod & (HIWORD(vmbus_loglevel))) && \
+            (lvl <= LOWORD(vmbus_loglevel)))    \
+                printk(KERN_DEBUG #mod": %s() " fmt "\n", __func__, ## args);\
+        } while (0)
+
+#define DPRINT_DBG(mod, fmt, args...) do {\
+        if ((mod & (HIWORD(vmbus_loglevel))) &&         \
+            (DEBUG_LVL <= LOWORD(vmbus_loglevel)))      \
+                printk(KERN_DEBUG #mod": %s() " fmt "\n", __func__, ## args);\
+        } while (0)
+
+#define DPRINT_INFO(mod, fmt, args...) do {\
+        if ((mod & (HIWORD(vmbus_loglevel))) &&         \
+            (INFO_LVL <= LOWORD(vmbus_loglevel)))       \
+                printk(KERN_INFO #mod": " fmt "\n", ## args);\
+        } while (0)
+
+#define DPRINT_WARN(mod, fmt, args...) do {\
+        if ((mod & (HIWORD(vmbus_loglevel))) &&         \
+            (WARNING_LVL <= LOWORD(vmbus_loglevel)))    \
+                printk(KERN_WARNING #mod": WARNING! " fmt "\n", ## args);\
+        } while (0)
+
+#define DPRINT_ERR(mod, fmt, args...) do {\
+        if ((mod & (HIWORD(vmbus_loglevel))) &&         \
+            (ERROR_LVL <= LOWORD(vmbus_loglevel)))      \
+                printk(KERN_ERR #mod": %s() ERROR!! " fmt "\n", \
+                       __func__, ## args);\
+        } while (0)
+
+
+
+struct hv_driver;
+struct hv_device;
+
+struct hv_dev_port_info {
+        u32 int_mask;
+        u32 read_idx;
+        u32 write_idx;
+        u32 bytes_avail_toread;
+        u32 bytes_avail_towrite;
+};
+
+struct hv_device_info {
+        u32 chn_id;
+        u32 chn_state;
+        uuid_le chn_type;
+        uuid_le chn_instance;
+
+        u32 monitor_id;
+        u32 server_monitor_pending;
+        u32 server_monitor_latency;
+        u32 server_monitor_conn_id;
+        u32 client_monitor_pending;
+        u32 client_monitor_latency;
+        u32 client_monitor_conn_id;
+
+        struct hv_dev_port_info inbound;
+        struct hv_dev_port_info outbound;
+};
+
+/* Base driver object */
+struct hv_driver {
+        const char *name;
+
+        /* 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;
+
+        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);
+
+/**
+ * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
+ *
+ * This macro is used to create a struct hv_vmbus_device_id that matches a
+ * specific device.
+ */
+#define VMBUS_DEVICE(g0, g1, g2, g3, g4, g5, g6, g7,    \
+                     g8, g9, ga, gb, gc, gd, ge, gf)    \
+        .guid = { g0, g1, g2, g3, g4, g5, g6, g7,       \
+                  g8, g9, ga, gb, gc, gd, ge, gf },
+
+/*
+ * 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
+
+#define HV_S_OK                         0x00000000
+#define HV_E_FAIL                       0x80004005
+#define HV_ERROR_NOT_SUPPORTED          0x80070032
+#define HV_ERROR_MACHINE_LOCKED         0x800704F7
+
+/*
+ * 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 (*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 hyperv_service_callback {
+        u8 msg_type;
+        char *log_msg;
+        uuid_le data;
+        struct vmbus_channel *channel;
+        void (*callback) (void *context);
+};
+
+extern void prep_negotiate_resp(struct icmsg_hdr *,
+                                struct icmsg_negotiate *, u8 *);
+
+#endif /* _HYPERV_H */