Merge branch 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit

[mirror_ubuntu-zesty-kernel.git] / include / linux / hyperv.h

/*
 *
 * 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_UNKNOWN,
};

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;

        /* dynamic device GUID's */
        struct  {
                spinlock_t lock;
                struct list_head list;
        } dynids;

        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);

void vmbus_setevent(struct vmbus_channel *channel);
/*
 * 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  void hv_signal_on_read(struct vmbus_channel *channel)
{
        u32 cur_write_sz;
        u32 pending_sz;
        struct hv_ring_buffer_info *rbi = &channel->inbound;

        /*
         * 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;

        cur_write_sz = hv_get_bytes_to_write(rbi);

        if (cur_write_sz >= pending_sz)
                vmbus_setevent(channel);

        return;
}

/*
 * 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 priv_read_loc = ring_info->priv_read_index;
        void *ring_buffer = hv_get_ring_buffer(ring_info);
        u32 dsize = ring_info->ring_datasize;
        /*
         * delta is the difference between what is available to read and
         * what was already consumed in place. We commit read index after
         * the whole batch is processed.
         */
        u32 delta = priv_read_loc >= ring_info->ring_buffer->read_index ?
                priv_read_loc - ring_info->ring_buffer->read_index :
                (dsize - ring_info->ring_buffer->read_index) + priv_read_loc;
        u32 bytes_avail_toread = (hv_get_bytes_to_read(ring_info) - delta);

        if (bytes_avail_toread < sizeof(struct vmpacket_descriptor))
                return NULL;

        return ring_buffer + priv_read_loc;
}

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

        /*
         * Include the packet trailer.
         */
        ring_info->priv_read_index += packetlen + VMBUS_PKT_TRAILER;
        ring_info->priv_read_index %= dsize;
}

/*
 * 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;

        hv_signal_on_read(channel);
}


#endif /* _HYPERV_H */