v4.19.13 snapshot.
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
new file mode 100644
index 0000000..5185a16
--- /dev/null
+++ b/include/linux/hyperv.h
@@ -0,0 +1,1549 @@
+/*
+ *
+ * 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 <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>
+
+#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;
+
+ /*
+ * 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[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 */
+ struct reciprocal_value ring_size_div10_reciprocal;
+ spinlock_t ring_lock;
+
+ u32 ring_datasize; /* < ring_size */
+ u32 priv_read_index;
+};
+
+
+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)
+ * 2 . 4 (Windows 8)
+ * 3 . 0 (Windows 8 R2)
+ * 4 . 0 (Windows 10)
+ * 5 . 0 (Newer 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_WIN10_V5 ((5 << 16) | (0))
+
+#define VERSION_INVAL -1
+
+#define VERSION_CURRENT VERSION_WIN10_V5
+
+/* 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;
+
+static inline u32
+hv_ringbuffer_pending_size(const struct hv_ring_buffer_info *rbi)
+{
+ return rbi->ring_buffer->pending_send_sz;
+}
+
+/*
+ * 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 */
+ union {
+ u64 interrupt_page;
+ struct {
+ u8 msg_sint;
+ u8 padding1[3];
+ u32 padding2;
+ };
+ };
+ 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;
+
+ 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;
+ } 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;
+};
+
+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 */
+ struct completion rescind_event;
+
+ 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 */
+
+ struct vmbus_close_msg close_msg;
+
+ /* Statistics */
+ u64 interrupts; /* Host to Guest interrupts */
+ u64 sig_events; /* Guest to Host events */
+
+ /* Channel callback's invoked in softirq context */
+ struct tasklet_struct callback_event;
+ void (*onchannel_callback)(void *context);
+ void *channel_callback_context;
+
+ /*
+ * 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 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;
+
+ /*
+ * 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 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 two 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;
+
+ bool probe_done;
+
+ /*
+ * 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;
+};
+
+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_affinity_state(struct vmbus_channel *c,
+ enum hv_numa_policy policy)
+{
+ c->affinity_policy = policy;
+}
+
+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)
+{
+ 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_pagebuffer(struct vmbus_channel *channel,
+ struct hv_page_buffer pagebuffers[],
+ u32 pagecount,
+ 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);
+
+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);
+
+
+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;
+ struct kset *channels_kset;
+};
+
+
+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);
+}
+
+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;
+};
+
+void hv_ringbuffer_get_debuginfo(const struct hv_ring_buffer_info *ring_info,
+ struct hv_ring_buffer_debug_info *debug_info);
+
+/* 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 = 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 *icmsghdrp, u8 *buf,
+ 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(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(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);
+}
+
+
+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);
+
+/*
+ * Get next packet descriptor from iterator
+ * If at end of list, return NULL and update host.
+ */
+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))
+
+#endif /* _HYPERV_H */