Quelle hyperv.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
*
* Copyright (c) 2011, Microsoft Corporation.
*
* 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 <linux/mm.h>
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/interrupt.h>
#include <linux/reciprocal_div.h>
#include <hyperv/hvhdk.h>

#define MAX_PAGE_BUFFER_COUNT    32
#define MAX_MULTIPAGE_BUFFER_COUNT   32 /* 128K */

#pragma pack(push, 1)

/*
* Types for GPADL, decides is how GPADL header is created.
*
* It doesn't make much difference between BUFFER and RING if PAGE_SIZE is the
* same as HV_HYP_PAGE_SIZE.
*
* If PAGE_SIZE is bigger than HV_HYP_PAGE_SIZE, the headers of ring buffers
* will be of PAGE_SIZE, however, only the first HV_HYP_PAGE will be put
* into gpadl, therefore the number for HV_HYP_PAGE and the indexes of each
* HV_HYP_PAGE will be different between different types of GPADL, for example
* if PAGE_SIZE is 64K:
*
* BUFFER:
*
* gva:    |--       64k      --|--       64k      --| ... |
* gpa:    | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k |
* index:  0    1    2     15   16   17   18 .. 31   32 ...
*         |    |    ...   |    |    |   ...    |   ...
*         v    V          V    V    V          V
* gpadl:  | 4k | 4k | ... | 4k | 4k | 4k | ... | 4k | ... |
* index:  0    1    2 ... 15   16   17   18 .. 31   32 ...
*
* RING:
*
*         | header  |           data           | header  |     data      |
* gva:    |-- 64k --|--       64k      --| ... |-- 64k --|-- 64k --| ... |
* gpa:    | 4k | .. | 4k | 4k | ... | 4k | ... | 4k | .. | 4k | .. | ... |
* index:  0    1    16   17   18    31   ...   n   n+1  n+16 ...         2n
*         |         /    /          /          |         /               /
*         |        /    /          /           |        /               /
*         |       /    /   ...    /    ...     |       /      ...      /
*         |      /    /          /             |      /               /
*         |     /    /          /              |     /               /
*         V    V    V          V               V    V               v
* gpadl:  | 4k | 4k |   ...    |    ...        | 4k | 4k |  ...     |
* index:  0    1    2   ...    16   ...       n-15 n-14 n-13  ...  2n-30
*/
enum hv_gpadl_type {
HV_GPADL_BUFFER,
HV_GPADL_RING
};

/* 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;

/*
* WS2012/Win8 and later versions of Hyper-V implement interrupt
* driven flow management. The feature bit feat_pending_send_sz
* is set by the host on the host->guest ring buffer, and by the
* guest on the guest->host ring buffer.
*
* The meaning of the feature bit is a bit complex in that it has
* semantics that apply to both ring buffers.  If the guest sets
* the feature bit in the guest->host ring buffer, the guest is
* telling the host that:
* 1) It will set the pending_send_sz field in the guest->host ring
*    buffer when it is waiting for space to become available, and
* 2) It will read the pending_send_sz field in the host->guest
*    ring buffer and interrupt the host when it frees enough space
*
* Similarly, if the host sets the feature bit in the host->guest
* ring buffer, the host is telling the guest that:
* 1) It will set the pending_send_sz field in the host->guest ring
*    buffer when it is waiting for space to become available, and
* 2) It will read the pending_send_sz field in the guest->host
*    ring buffer and interrupt the guest when it frees enough space
*
* If either the guest or host does not set the feature bit that it
* owns, that guest or host must do polling if it encounters a full
* ring buffer, and not signal the other end with an interrupt.
*/
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[PAGE_SIZE - 68];

/*
* Ring data starts here + RingDataStartOffset
* !!! DO NOT place any fields below this !!!
*/
u8 buffer[];
} __packed;

/*
* If the requested ring buffer size is at least 8 times the size of the
* header, steal space from the ring buffer for the header. Otherwise, add
* space for the header so that is doesn't take too much of the ring buffer
* space.
*
* The factor of 8 is somewhat arbitrary. The goal is to prevent adding a
* relatively small header (4 Kbytes on x86) to a large-ish power-of-2 ring
* buffer size (such as 128 Kbytes) and so end up making a nearly twice as
* large allocation that will be almost half wasted. As a contrasting example,
* on ARM64 with 64 Kbyte page size, we don't want to take 64 Kbytes for the
* header from a 128 Kbyte allocation, leaving only 64 Kbytes for the ring.
* In this latter case, we must add 64 Kbytes for the header and not worry
* about what's wasted.
*/
#define VMBUS_HEADER_ADJ(payload_sz) \
((payload_sz) >=  8 * sizeof(struct hv_ring_buffer) ? \
0 : sizeof(struct hv_ring_buffer))

/* Calculate the proper size of a ringbuffer, it must be page-aligned */
#define VMBUS_RING_SIZE(payload_sz) PAGE_ALIGN(VMBUS_HEADER_ADJ(payload_sz) + \
            (payload_sz))

struct hv_ring_buffer_info {
struct hv_ring_buffer *ring_buffer;
u32 ring_size;   /* Include the shared header */
struct reciprocal_value ring_size_div10_reciprocal;
spinlock_t ring_lock;

u32 ring_datasize;  /* < ring_size */
u32 priv_read_index;
/*
* The ring buffer mutex lock. This lock prevents the ring buffer from
* being freed while the ring buffer is being accessed.
*/
struct mutex ring_buffer_mutex;

/* Buffer that holds a copy of an incoming host packet */
void *pkt_buffer;
u32 pkt_buffer_size;
};

static inline u32 hv_get_bytes_to_read(const 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(const 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;
}

static inline u32 hv_get_avail_to_write_percent(
  const struct hv_ring_buffer_info *rbi)
{
u32 avail_write = hv_get_bytes_to_write(rbi);

return reciprocal_divide(
   (avail_write  << 3) + (avail_write << 1),
   rbi->ring_size_div10_reciprocal);
}

/*
* 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, WS2008 R2)
* 2 . 4  (Windows 8, WS2012)
* 3 . 0  (Windows 8.1, WS2012 R2)
* 4 . 0  (Windows 10)
* 4 . 1  (Windows 10 RS3)
* 5 . 0  (Newer Windows 10)
* 5 . 1  (Windows 10 RS4)
* 5 . 2  (Windows Server 2019, RS5)
* 5 . 3  (Windows Server 2022)
*
* The WS2008 and WIN7 versions are listed here for
* completeness but are no longer supported in the
* Linux kernel.
*/

#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_WIN10_V4_1 ((4 << 16) | (1))
#define VERSION_WIN10_V5 ((5 << 16) | (0))
#define VERSION_WIN10_V5_1 ((5 << 16) | (1))
#define VERSION_WIN10_V5_2 ((5 << 16) | (2))
#define VERSION_WIN10_V5_3 ((5 << 16) | (3))

/* 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 {
guid_t if_type;
guid_t 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 structure 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: a value of zero means a
* primary channel and a value of non-zero means a sub-channel.
*
* Before Win8, the field is reserved, meaning it's always zero.
*/
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[];
} __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[];
};

/*
* 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;

#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_MODIFYCHANNEL  = 22,
CHANNELMSG_TL_CONNECT_RESULT  = 23,
CHANNELMSG_MODIFYCHANNEL_RESPONSE = 24,
CHANNELMSG_COUNT
};

/* Hyper-V supports about 2048 channels, and the RELIDs start with 1. */
#define INVALID_RELID U32_MAX

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;

/* Modify Channel Result parameters */
struct vmbus_channel_modifychannel_response {
struct vmbus_channel_message_header header;
u32 child_relid;
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[];
} __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[];
} __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 */
union {
  u64 interrupt_page;
  struct {
   u8 msg_sint;
   u8 msg_vtl;
   u8 reserved[6];
  };
};
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;
guid_t guest_endpoint_id;
guid_t host_service_id;
} __packed;

/* Modify Channel parameters, cf. vmbus_send_modifychannel() */
struct vmbus_channel_modifychannel {
struct vmbus_channel_message_header header;
u32 child_relid;
u32 target_vp;
} __packed;

struct vmbus_channel_version_response {
struct vmbus_channel_message_header header;
u8 version_supported;

u8 connection_state;
u16 padding;

/*
* On new hosts that support VMBus protocol 5.0, we must use
* VMBUS_MESSAGE_CONNECTION_ID_4 for the Initiate Contact Message,
* and for subsequent messages, we must use the Message Connection ID
* field in the host-returned Version Response Message.
*
* On old hosts, we should always use VMBUS_MESSAGE_CONNECTION_ID (1).
*/
u32 msg_conn_id;
} __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;
struct vmbus_channel *waiting_channel;
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;
  struct vmbus_channel_modifychannel_response modify_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[];
};

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

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,
};

/*
* Provides request ids for VMBus. Encapsulates guest memory
* addresses and stores the next available slot in req_arr
* to generate new ids in constant time.
*/
struct vmbus_requestor {
u64 *req_arr;
unsigned long *req_bitmap; /* is a given slot available? */
u32 size;
u64 next_request_id;
spinlock_t req_lock; /* provides atomicity */
};

#define VMBUS_NO_RQSTOR U64_MAX
#define VMBUS_RQST_ERROR (U64_MAX - 1)
#define VMBUS_RQST_ADDR_ANY U64_MAX
/* NetVSC-specific */
#define VMBUS_RQST_ID_NO_RESPONSE (U64_MAX - 2)
/* StorVSC-specific */
#define VMBUS_RQST_INIT (U64_MAX - 2)
#define VMBUS_RQST_RESET (U64_MAX - 3)

struct vmbus_device {
/* preferred ring buffer size in KB, 0 means no preferred size for this device */
size_t pref_ring_size;
u16  dev_type;
guid_t guid;
bool perf_device;
bool allowed_in_isolated;
};

#define VMBUS_DEFAULT_MAX_PKT_SIZE 4096

struct vmbus_gpadl {
u32 gpadl_handle;
u32 size;
void *buffer;
bool decrypted;
};

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 */
bool rescind_ref; /* got rescind msg, got channel reference */
struct completion rescind_event;

struct vmbus_gpadl ringbuffer_gpadlhandle;

/* Allocated memory for ring buffer */
struct page *ringbuffer_page;
u32 ringbuffer_pagecount;
u32 ringbuffer_send_offset;
struct hv_ring_buffer_info outbound; /* send to parent */
struct hv_ring_buffer_info inbound; /* receive from parent */

struct vmbus_close_msg close_msg;

/* Statistics */
u64 interrupts; /* Host to Guest interrupts */
u64 sig_events; /* Guest to Host events */

/*
* Guest to host interrupts caused by the outbound ring buffer changing
* from empty to not empty.
*/
u64 intr_out_empty;

/*
* Indicates that a full outbound ring buffer was encountered. The flag
* is set to true when a full outbound ring buffer is encountered and
* set to false when a write to the outbound ring buffer is completed.
*/
bool out_full_flag;

/* Channel callback's invoked in softirq context */
struct tasklet_struct callback_event;
void (*onchannel_callback)(void *context);
void *channel_callback_context;

void (*change_target_cpu_callback)(struct vmbus_channel *channel,
   u32 old, u32 new);

/*
* Synchronize channel scheduling and channel removal; see the inline
* comments in vmbus_chan_sched() and vmbus_reset_channel_cb().
*/
spinlock_t sched_lock;

/*
* A channel can be marked for one of three modes of reading:
*   BATCHED - callback called from taslket and should read
*            channel until empty. Interrupts from the host
*            are masked while read is in process (default).
*   DIRECT - callback called from tasklet (softirq).
*   ISR - callback called in interrupt context and must
*         invoke its own deferred processing.
*         Host interrupts are disabled and must be re-enabled
*         when ring is empty.
*/
enum hv_callback_mode {
  HV_CALL_BATCHED,
  HV_CALL_DIRECT,
  HV_CALL_ISR
} callback_mode;

bool is_dedicated_interrupt;
u64 sig_event;

/*
* Starting with win8, this field will be used to specify the
* target CPU 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_cpu;
/*
* 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 extension
* 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 offered 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);

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

/*
* Defer freeing channel until after all cpu's have
* gone through grace period.
*/
struct rcu_head rcu;

/*
* For sysfs per-channel properties.
*/
struct kobject   kobj;

/*
* 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 more 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 adversely 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;

bool probe_done;

/*
* Cache the device ID here for easy access; this is useful, in
* particular, in situations where the channel's device_obj has
* not been allocated/initialized yet.
*/
u16 device_id;

/*
* We must offload the handling of the primary/sub channels
* from the single-threaded vmbus_connection.work_queue to
* two different workqueue, otherwise we can block
* vmbus_connection.work_queue and hang: see vmbus_process_offer().
*/
struct work_struct add_channel_work;

/*
* Guest to host interrupts caused by the inbound ring buffer changing
* from full to not full while a packet is waiting.
*/
u64 intr_in_full;

/*
* The total number of write operations that encountered a full
* outbound ring buffer.
*/
u64 out_full_total;

/*
* The number of write operations that were the first to encounter a
* full outbound ring buffer.
*/
u64 out_full_first;

/* enabling/disabling fuzz testing on the channel (default is false)*/
bool fuzz_testing_state;

/*
* Interrupt delay will delay the guest from emptying the ring buffer
* for a specific amount of time. The delay is in microseconds and will
* be between 1 to a maximum of 1000, its default is 0 (no delay).
* The  Message delay will delay guest reading on a per message basis
* in microseconds between 1 to 1000 with the default being 0
* (no delay).
*/
u32 fuzz_testing_interrupt_delay;
u32 fuzz_testing_message_delay;

/* callback to generate a request ID from a request address */
u64 (*next_request_id_callback)(struct vmbus_channel *channel, u64 rqst_addr);
/* callback to retrieve a request address from a request ID */
u64 (*request_addr_callback)(struct vmbus_channel *channel, u64 rqst_id);

/* request/transaction ids for VMBus */
struct vmbus_requestor requestor;
u32 rqstor_size;

/* The max size of a packet on this channel */
u32 max_pkt_size;

/* function to mmap ring buffer memory to the channel's sysfs ring attribute */
int (*mmap_ring_buffer)(struct vmbus_channel *channel, struct vm_area_struct *vma);

/* boolean to control visibility of sysfs for ring buffer */
bool ring_sysfs_visible;
};

#define lock_requestor(channel, flags)     \
do {         \
struct vmbus_requestor *rqstor = &(channel)->requestor;  \
         \
spin_lock_irqsave(&rqstor->req_lock, flags);   \
} while (0)

static __always_inline void unlock_requestor(struct vmbus_channel *channel,
          unsigned long flags)
{
struct vmbus_requestor *rqstor = &channel->requestor;

spin_unlock_irqrestore(&rqstor->req_lock, flags);
}

u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr);
u64 __vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id,
          u64 rqst_addr);
u64 vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id,
        u64 rqst_addr);
u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id);

static inline bool is_hvsock_offer(const struct vmbus_channel_offer_channel *o)
{
return !!(o->offer.chn_flags & VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER);
}

static inline bool is_hvsock_channel(const struct vmbus_channel *c)
{
return is_hvsock_offer(&c->offermsg);
}

static inline bool is_sub_channel(const struct vmbus_channel *c)
{
return c->offermsg.offer.sub_channel_index != 0;
}

static inline void set_channel_read_mode(struct vmbus_channel *c,
     enum hv_callback_mode mode)
{
c->callback_mode = mode;
}

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)
{
unsigned long flags;

if (size) {
  spin_lock_irqsave(&c->outbound.ring_lock, flags);
  ++c->out_full_total;

  if (!c->out_full_flag) {
   ++c->out_full_first;
   c->out_full_flag = true;
  }
  spin_unlock_irqrestore(&c->outbound.ring_lock, flags);
} else {
  c->out_full_flag = false;
}

c->outbound.ring_buffer->pending_send_sz = size;
}

void vmbus_onmessage(struct vmbus_channel_message_header *hdr);

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 *));

/* 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;

int vmbus_alloc_ring(struct vmbus_channel *channel,
       u32 send_size, u32 recv_size);
void vmbus_free_ring(struct vmbus_channel *channel);

int vmbus_connect_ring(struct vmbus_channel *channel,
         void (*onchannel_callback)(void *context),
         void *context);
int vmbus_disconnect_ring(struct vmbus_channel *channel);

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_getid(struct vmbus_channel *channel,
      void *buffer,
      u32 bufferLen,
      u64 requestid,
      u64 *trans_id,
      enum vmbus_packet_type type,
      u32 flags);
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_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,
          struct vmbus_gpadl *gpadl);

extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
         struct vmbus_gpadl *gpadl);

void vmbus_reset_channel_cb(struct vmbus_channel *channel);

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);

/* 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 */
guid_t 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 *);
void (*remove)(struct hv_device *dev);
void (*shutdown)(struct hv_device *);

int (*suspend)(struct hv_device *);
int (*resume)(struct hv_device *);

};

/* Base device object */
struct hv_device {
/* the device type id of this device */
guid_t dev_type;

/* the device instance id of this device */
guid_t dev_instance;
u16 vendor_id;
u16 device_id;

struct device device;
/*
* Driver name to force a match.  Do not set directly, because core
* frees it.  Use driver_set_override() to set or clear it.
*/
const char *driver_override;

struct vmbus_channel *channel;
struct kset      *channels_kset;
struct device_dma_parameters dma_parms;
u64 dma_mask;

/* place holder to keep track of the dir for hv device in debugfs */
struct dentry *debug_dir;

};

#define device_to_hv_device(d) container_of_const(d, struct hv_device, device)
#define drv_to_hv_drv(d) container_of_const(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);
}

struct device *hv_get_vmbus_root_device(void);

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;
};

int hv_ringbuffer_get_debuginfo(struct hv_ring_buffer_info *ring_info,
    struct hv_ring_buffer_debug_info *debug_info);

bool hv_ringbuffer_spinlock_busy(struct vmbus_channel *channel);

/* 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);

/*
* GUID definitions of various offer types - services offered to the guest.
*/

/*
* Network GUID
* {f8615163-df3e-46c5-913f-f2d2f965ed0e}
*/
#define HV_NIC_GUID \
.guid = GUID_INIT(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \
     0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e)

/*
* IDE GUID
* {32412632-86cb-44a2-9b5c-50d1417354f5}
*/
#define HV_IDE_GUID \
.guid = GUID_INIT(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \
     0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)

/*
* SCSI GUID
* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
*/
#define HV_SCSI_GUID \
.guid = GUID_INIT(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \
     0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)

/*
* Shutdown GUID
* {0e0b6031-5213-4934-818b-38d90ced39db}
*/
#define HV_SHUTDOWN_GUID \
.guid = GUID_INIT(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \
     0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb)

/*
* Time Synch GUID
* {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
*/
#define HV_TS_GUID \
.guid = GUID_INIT(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \
     0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)

/*
* Heartbeat GUID
* {57164f39-9115-4e78-ab55-382f3bd5422d}
*/
#define HV_HEART_BEAT_GUID \
.guid = GUID_INIT(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \
     0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)

/*
* KVP GUID
* {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
*/
#define HV_KVP_GUID \
.guid = GUID_INIT(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \
     0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6)

/*
* Dynamic memory GUID
* {525074dc-8985-46e2-8057-a307dc18a502}
*/
#define HV_DM_GUID \
.guid = GUID_INIT(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \
     0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02)

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

/*
* Keyboard GUID
* {f912ad6d-2b17-48ea-bd65-f927a61c7684}
*/
#define HV_KBD_GUID \
.guid = GUID_INIT(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \
     0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84)

/*
* VSS (Backup/Restore) GUID
*/
#define HV_VSS_GUID \
.guid = GUID_INIT(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \
     0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40)
/*
* Synthetic Video GUID
* {DA0A7802-E377-4aac-8E77-0558EB1073F8}
*/
#define HV_SYNTHVID_GUID \
.guid = GUID_INIT(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \
     0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8)

/*
* Synthetic FC GUID
* {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
*/
#define HV_SYNTHFC_GUID \
.guid = GUID_INIT(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 = GUID_INIT(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 = GUID_INIT(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 = GUID_INIT(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \
     0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)

/*
* Linux doesn't support these 4 devices: the first two are for
* Automatic Virtual Machine Activation, the third is for
* Remote Desktop Virtualization, and the fourth is Initial
* Machine Configuration (IMC) used only by Windows guests.
* {f8e65716-3cb3-4a06-9a60-1889c5cccab5}
* {3375baf4-9e15-4b30-b765-67acb10d607b}
* {276aacf4-ac15-426c-98dd-7521ad3f01fe}
* {c376c1c3-d276-48d2-90a9-c04748072c60}
*/

#define HV_AVMA1_GUID \
.guid = GUID_INIT(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \
     0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5)

#define HV_AVMA2_GUID \
.guid = GUID_INIT(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \
     0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b)

#define HV_RDV_GUID \
.guid = GUID_INIT(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \
     0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)

#define HV_IMC_GUID \
.guid = GUID_INIT(0xc376c1c3, 0xd276, 0x48d2, 0x90, 0xa9, \
     0xc0, 0x47, 0x48, 0x07, 0x2c, 0x60)

/*
* 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 ICMSGTYPE_FCOPY   7

#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 *);
int (*util_init_transport)(void);
void (*util_deinit)(void);
int (*util_pre_suspend)(void);
int (*util_pre_resume)(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;

#define IC_VERSION_NEGOTIATION_MAX_VER_COUNT 100
#define ICMSG_HDR (sizeof(struct vmbuspipe_hdr) + sizeof(struct icmsg_hdr))
#define ICMSG_NEGOTIATE_PKT_SIZE(icframe_vercnt, icmsg_vercnt) \
(ICMSG_HDR + sizeof(struct icmsg_negotiate) + \
  (((icframe_vercnt) + (icmsg_vercnt)) * sizeof(struct ic_version)))

struct icmsg_negotiate {
u16 icframe_vercnt;
u16 icmsg_vercnt;
u32 reserved;
struct ic_version icversion_data[]; /* 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;
guid_t data;
struct vmbus_channel *channel;
void (*callback)(void *context);
};

struct hv_dma_range {
dma_addr_t dma;
u32 mapping_size;
};

#define MAX_SRV_VER 0x7ffffff
extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, u8 *buf, u32 buflen,
    const int *fw_version, int fw_vercnt,
    const int *srv_version, int srv_vercnt,
    int *nego_fw_version, int *nego_srv_version);

void hv_process_channel_removal(struct vmbus_channel *channel);

void vmbus_setevent(struct vmbus_channel *channel);
/*
* Negotiated version with the Host.
*/

extern __u32 vmbus_proto_version;

int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id,
      const guid_t *shv_host_servie_id);
int vmbus_send_modifychannel(struct vmbus_channel *channel, u32 target_vp);
void vmbus_set_event(struct vmbus_channel *channel);
int vmbus_channel_set_cpu(struct vmbus_channel *channel, u32 target_cpu);

/* Get the start of the ring buffer. */
static inline void *
hv_get_ring_buffer(const struct hv_ring_buffer_info *ring_info)
{
return ring_info->ring_buffer->buffer;
}

/*
* Mask off host interrupt callback notifications
*/
static inline void hv_begin_read(struct hv_ring_buffer_info *rbi)
{
rbi->ring_buffer->interrupt_mask = 1;

/* make sure mask update is not reordered */
virt_mb();
}

/*
* Re-enable host callback and return number of outstanding bytes
*/
static inline u32 hv_end_read(struct hv_ring_buffer_info *rbi)
{

rbi->ring_buffer->interrupt_mask = 0;

/* make sure mask update is not reordered */
virt_mb();

/*
* Now check to see if the ring buffer is still empty.
* If it is not, we raced and we need to process new
* incoming messages.
*/
return hv_get_bytes_to_read(rbi);
}

/*
* An API to support in-place processing of incoming VMBUS packets.
*/

/* Get data payload associated with descriptor */
static inline void *hv_pkt_data(const struct vmpacket_descriptor *desc)
{
return (void *)((unsigned long)desc + (desc->offset8 << 3));
}

/* Get data size associated with descriptor */
static inline u32 hv_pkt_datalen(const struct vmpacket_descriptor *desc)
{
return (desc->len8 << 3) - (desc->offset8 << 3);
}

/* Get packet length associated with descriptor */
static inline u32 hv_pkt_len(const struct vmpacket_descriptor *desc)
{
return desc->len8 << 3;
}

struct vmpacket_descriptor *
hv_pkt_iter_first(struct vmbus_channel *channel);

struct vmpacket_descriptor *
__hv_pkt_iter_next(struct vmbus_channel *channel,
     const struct vmpacket_descriptor *pkt);

void hv_pkt_iter_close(struct vmbus_channel *channel);

static inline struct vmpacket_descriptor *
hv_pkt_iter_next(struct vmbus_channel *channel,
   const struct vmpacket_descriptor *pkt)
{
struct vmpacket_descriptor *nxt;

nxt = __hv_pkt_iter_next(channel, pkt);
if (!nxt)
  hv_pkt_iter_close(channel);

return nxt;
}

#define foreach_vmbus_pkt(pkt, channel) \
for (pkt = hv_pkt_iter_first(channel); pkt; \
     pkt = hv_pkt_iter_next(channel, pkt))

/*
* Interface for passing data between SR-IOV PF and VF drivers. The VF driver
* sends requests to read and write blocks. Each block must be 128 bytes or
* smaller. Optionally, the VF driver can register a callback function which
* will be invoked when the host says that one or more of the first 64 block
* IDs is "invalid" which means that the VF driver should reread them.
*/
#define HV_CONFIG_BLOCK_SIZE_MAX 128

int hyperv_read_cfg_blk(struct pci_dev *dev, void *buf, unsigned int buf_len,
   unsigned int block_id, unsigned int *bytes_returned);
int hyperv_write_cfg_blk(struct pci_dev *dev, void *buf, unsigned int len,
    unsigned int block_id);
int hyperv_reg_block_invalidate(struct pci_dev *dev, void *context,
    void (*block_invalidate)(void *context,
        u64 block_mask));

struct hyperv_pci_block_ops {
int (*read_block)(struct pci_dev *dev, void *buf, unsigned int buf_len,
     unsigned int block_id, unsigned int *bytes_returned);
int (*write_block)(struct pci_dev *dev, void *buf, unsigned int len,
      unsigned int block_id);
int (*reg_blk_invalidate)(struct pci_dev *dev, void *context,
      void (*block_invalidate)(void *context,
          u64 block_mask));
};

extern struct hyperv_pci_block_ops hvpci_block_ops;

static inline unsigned long virt_to_hvpfn(void *addr)
{
phys_addr_t paddr;

if (is_vmalloc_addr(addr))
  paddr = page_to_phys(vmalloc_to_page(addr)) +
         offset_in_page(addr);
else
  paddr = __pa(addr);

return  paddr >> HV_HYP_PAGE_SHIFT;
}

#define NR_HV_HYP_PAGES_IN_PAGE (PAGE_SIZE / HV_HYP_PAGE_SIZE)
#define offset_in_hvpage(ptr) ((unsigned long)(ptr) & ~HV_HYP_PAGE_MASK)
#define HVPFN_UP(x) (((x) + HV_HYP_PAGE_SIZE-1) >> HV_HYP_PAGE_SHIFT)
#define HVPFN_DOWN(x) ((x) >> HV_HYP_PAGE_SHIFT)
#define page_to_hvpfn(page) (page_to_pfn(page) * NR_HV_HYP_PAGES_IN_PAGE)

#endif /* _HYPERV_H */

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