/*
*
* Copyright (c) 2011, Microsoft Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Authors:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
* K. Y. Srinivasan <kys@microsoft.com>
*
*/
#ifndef _HYPERV_H
#define _HYPERV_H
#include <uapi/linux/hyperv.h>
#include <uapi/asm/hyperv.h>
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#define MAX_PAGE_BUFFER_COUNT 32
#define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */
#pragma pack(push, 1)
/* Single-page buffer */
struct hv_page_buffer {
u32 len;
u32 offset;
u64 pfn;
};
/* Multiple-page buffer */
struct hv_multipage_buffer {
/* Length and Offset determines the # of pfns in the array */
u32 len;
u32 offset;
u64 pfn_array[MAX_MULTIPAGE_BUFFER_COUNT];
};
/*
* Multiple-page buffer array; the pfn array is variable size:
* The number of entries in the PFN array is determined by
* "len" and "offset".
*/
struct hv_mpb_array {
/* Length and Offset determines the # of pfns in the array */
u32 len;
u32 offset;
u64 pfn_array[];
};
/* 0x18 includes the proprietary packet header */
#define MAX_PAGE_BUFFER_PACKET (0x18 + \
(sizeof(struct hv_page_buffer) * \
MAX_PAGE_BUFFER_COUNT))
#define MAX_MULTIPAGE_BUFFER_PACKET (0x18 + \
sizeof(struct hv_multipage_buffer))
#pragma pack(pop)
struct hv_ring_buffer {
/* Offset in bytes from the start of ring data below */
u32 write_index;
/* Offset in bytes from the start of ring data below */
u32 read_index;
u32 interrupt_mask;
/*
* Win8 uses some of the reserved bits to implement
* interrupt driven flow management. On the send side
* we can request that the receiver interrupt the sender
* when the ring transitions from being full to being able
* to handle a message of size "pending_send_sz".
*
* Add necessary state for this enhancement.
*/
u32 pending_send_sz;
u32 reserved1[12];
union {
struct {
u32 feat_pending_send_sz:1;
};
u32 value;
} feature_bits;
/* Pad it to PAGE_SIZE so that data starts on page boundary */
u8 reserved2[4028];
/*
* Ring data starts here + RingDataStartOffset
* !!! DO NOT place any fields below this !!!
*/
u8 buffer[0];
} __packed;
struct hv_ring_buffer_info {
struct hv_ring_buffer *ring_buffer;
u32 ring_size; /* Include the shared header */
spinlock_t ring_lock;
u32 ring_datasize; /* < ring_size */
u32 ring_data_startoffset;
u32 priv_write_index;
u32 priv_read_index;
};
/*
*
* hv_get_ringbuffer_availbytes()
*
* Get number of bytes available to read and to write to
* for the specified ring buffer
*/
static inline void
hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi,
u32 *read, u32 *write)
{
u32 read_loc, write_loc, dsize;
/* Capture the read/write indices before they changed */
read_loc = rbi->ring_buffer->read_index;
write_loc = rbi->ring_buffer->write_index;
dsize = rbi->ring_datasize;
*write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
read_loc - write_loc;
*read = dsize - *write;
}
static inline u32 hv_get_bytes_to_read(struct hv_ring_buffer_info *rbi)
{
u32 read_loc, write_loc, dsize, read;
dsize = rbi->ring_datasize;
read_loc = rbi->ring_buffer->read_index;
write_loc = READ_ONCE(rbi->ring_buffer->write_index);
read = write_loc >= read_loc ? (write_loc - read_loc) :
(dsize - read_loc) + write_loc;
return read;
}
static inline u32 hv_get_bytes_to_write(struct hv_ring_buffer_info *rbi)
{
u32 read_loc, write_loc, dsize, write;
dsize = rbi->ring_datasize;
read_loc = READ_ONCE(rbi->ring_buffer->read_index);
write_loc = rbi->ring_buffer->write_index;
write = write_loc >= read_loc ? dsize - (write_loc - read_loc) :
read_loc - write_loc;
return write;
}
/*
* VMBUS version is 32 bit entity broken up into
* two 16 bit quantities: major_number. minor_number.
*
* 0 . 13 (Windows Server 2008)
* 1 . 1 (Windows 7)
* 2 . 4 (Windows 8)
* 3 . 0 (Windows 8 R2)
* 4 . 0 (Windows 10)
*/
#define VERSION_WS2008 ((0 << 16) | (13))
#define VERSION_WIN7 ((1 << 16) | (1))
#define VERSION_WIN8 ((2 << 16) | (4))
#define VERSION_WIN8_1 ((3 << 16) | (0))
#define VERSION_WIN10 ((4 << 16) | (0))
#define VERSION_INVAL -1
#define VERSION_CURRENT VERSION_WIN10
/* Make maximum size of pipe payload of 16K */
#define MAX_PIPE_DATA_PAYLOAD (sizeof(u8) * 16384)
/* Define PipeMode values. */
#define VMBUS_PIPE_TYPE_BYTE 0x00000000
#define VMBUS_PIPE_TYPE_MESSAGE 0x00000004
/* The size of the user defined data buffer for non-pipe offers. */
#define MAX_USER_DEFINED_BYTES 120
/* The size of the user defined data buffer for pipe offers. */
#define MAX_PIPE_USER_DEFINED_BYTES 116
/*
* At the center of the Channel Management library is the Channel Offer. This
* struct contains the fundamental information about an offer.
*/
struct vmbus_channel_offer {
uuid_le if_type;
uuid_le if_instance;
/*
* These two fields are not currently used.
*/
u64 reserved1;
u64 reserved2;
u16 chn_flags;
u16 mmio_megabytes; /* in bytes * 1024 * 1024 */
union {
/* Non-pipes: The user has MAX_USER_DEFINED_BYTES bytes. */
struct {
unsigned char user_def[MAX_USER_DEFINED_BYTES];
} std;
/*
* Pipes:
* The following sructure is an integrated pipe protocol, which
* is implemented on top of standard user-defined data. Pipe
* clients have MAX_PIPE_USER_DEFINED_BYTES left for their own
* use.
*/
struct {
u32 pipe_mode;
unsigned char user_def[MAX_PIPE_USER_DEFINED_BYTES];
} pipe;
} u;
/*
* The sub_channel_index is defined in win8.
*/
u16 sub_channel_index;
u16 reserved3;
} __packed;
/* Server Flags */
#define VMBUS_CHANNEL_ENUMERATE_DEVICE_INTERFACE 1
#define VMBUS_CHANNEL_SERVER_SUPPORTS_TRANSFER_PAGES 2
#define VMBUS_CHANNEL_SERVER_SUPPORTS_GPADLS 4
#define VMBUS_CHANNEL_NAMED_PIPE_MODE 0x10
#define VMBUS_CHANNEL_LOOPBACK_OFFER 0x100
#define VMBUS_CHANNEL_PARENT_OFFER 0x200
#define VMBUS_CHANNEL_REQUEST_MONITORED_NOTIFICATION 0x400
#define VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER 0x2000
struct vmpacket_descriptor {
u16 type;
u16 offset8;
u16 len8;
u16 flags;
u64 trans_id;
} __packed;
struct vmpacket_header {
u32 prev_pkt_start_offset;
struct vmpacket_descriptor descriptor;
} __packed;
struct vmtransfer_page_range {
u32 byte_count;
u32 byte_offset;
} __packed;
struct vmtransfer_page_packet_header {
struct vmpacket_descriptor d;
u16 xfer_pageset_id;
u8 sender_owns_set;
u8 reserved;
u32 range_cnt;
struct vmtransfer_page_range ranges[1];
} __packed;
struct vmgpadl_packet_header {
struct vmpacket_descriptor d;
u32 gpadl;
u32 reserved;
} __packed;
struct vmadd_remove_transfer_page_set {
struct vmpacket_descriptor d;
u32 gpadl;
u16 xfer_pageset_id;
u16 reserved;
} __packed;
/*
* This structure defines a range in guest physical space that can be made to
* look virtually contiguous.
*/
struct gpa_range {
u32 byte_count;
u32 byte_offset;
u64 pfn_array[0];
};
/*
* This is the format for an Establish Gpadl packet, which contains a handle by
* which this GPADL will be known and a set of GPA ranges associated with it.
* This can be converted to a MDL by the guest OS. If there are multiple GPA
* ranges, then the resulting MDL will be "chained," representing multiple VA
* ranges.
*/
struct vmestablish_gpadl {
struct vmpacket_descriptor d;
u32 gpadl;
u32 range_cnt;
struct gpa_range range[1];
} __packed;
/*
* This is the format for a Teardown Gpadl packet, which indicates that the
* GPADL handle in the Establish Gpadl packet will never be referenced again.
*/
struct vmteardown_gpadl {
struct vmpacket_descriptor d;
u32 gpadl;
u32 reserved; /* for alignment to a 8-byte boundary */
} __packed;
/*
* This is the format for a GPA-Direct packet, which contains a set of GPA
* ranges, in addition to commands and/or data.
*/
struct vmdata_gpa_direct {
struct vmpacket_descriptor d;
u32 reserved;
u32 range_cnt;
struct gpa_range range[1];
} __packed;
/* This is the format for a Additional Data Packet. */
struct vmadditional_data {
struct vmpacket_descriptor d;
u64 total_bytes;
u32 offset;
u32 byte_cnt;
unsigned char data[1];
} __packed;
union vmpacket_largest_possible_header {
struct vmpacket_descriptor simple_hdr;
struct vmtransfer_page_packet_header xfer_page_hdr;
struct vmgpadl_packet_header gpadl_hdr;
struct vmadd_remove_transfer_page_set add_rm_xfer_page_hdr;
struct vmestablish_gpadl establish_gpadl_hdr;
struct vmteardown_gpadl teardown_gpadl_hdr;
struct vmdata_gpa_direct data_gpa_direct_hdr;
};
#define VMPACKET_DATA_START_ADDRESS(__packet) \
(void *)(((unsigned char *)__packet) + \
((struct vmpacket_descriptor)__packet)->offset8 * 8)
#define VMPACKET_DATA_LENGTH(__packet) \
((((struct vmpacket_descriptor)__packet)->len8 - \
((struct vmpacket_descriptor)__packet)->offset8) * 8)
#define VMPACKET_TRANSFER_MODE(__packet) \
(((struct IMPACT)__packet)->type)
enum vmbus_packet_type {
VM_PKT_INVALID = 0x0,
VM_PKT_SYNCH = 0x1,
VM_PKT_ADD_XFER_PAGESET = 0x2,
VM_PKT_RM_XFER_PAGESET = 0x3,
VM_PKT_ESTABLISH_GPADL = 0x4,
VM_PKT_TEARDOWN_GPADL = 0x5,
VM_PKT_DATA_INBAND = 0x6,
VM_PKT_DATA_USING_XFER_PAGES = 0x7,
VM_PKT_DATA_USING_GPADL = 0x8,
VM_PKT_DATA_USING_GPA_DIRECT = 0x9,
VM_PKT_CANCEL_REQUEST = 0xa,
VM_PKT_COMP = 0xb,
VM_PKT_DATA_USING_ADDITIONAL_PKT = 0xc,
VM_PKT_ADDITIONAL_DATA = 0xd
};
#define VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED 1
/* Version 1 messages */
enum vmbus_channel_message_type {
CHANNELMSG_INVALID = 0,
CHANNELMSG_OFFERCHANNEL = 1,
CHANNELMSG_RESCIND_CHANNELOFFER = 2,
CHANNELMSG_REQUESTOFFERS = 3,
CHANNELMSG_ALLOFFERS_DELIVERED = 4,
CHANNELMSG_OPENCHANNEL = 5,
CHANNELMSG_OPENCHANNEL_RESULT = 6,
CHANNELMSG_CLOSECHANNEL = 7,
CHANNELMSG_GPADL_HEADER = 8,
CHANNELMSG_GPADL_BODY = 9,
CHANNELMSG_GPADL_CREATED = 10,
CHANNELMSG_GPADL_TEARDOWN = 11,
CHANNELMSG_GPADL_TORNDOWN = 12,
CHANNELMSG_RELID_RELEASED = 13,
CHANNELMSG_INITIATE_CONTACT = 14,
CHANNELMSG_VERSION_RESPONSE = 15,
CHANNELMSG_UNLOAD = 16,
CHANNELMSG_UNLOAD_RESPONSE = 17,
CHANNELMSG_18 = 18,
CHANNELMSG_19 = 19,
CHANNELMSG_20 = 20,
CHANNELMSG_TL_CONNECT_REQUEST = 21,
CHANNELMSG_COUNT
};
struct vmbus_channel_message_header {
enum vmbus_channel_message_type msgtype;
u32 padding;
} __packed;
/* Query VMBus Version parameters */
struct vmbus_channel_query_vmbus_version {
struct vmbus_channel_message_header header;
u32 version;
} __packed;
/* VMBus Version Supported parameters */
struct vmbus_channel_version_supported {
struct vmbus_channel_message_header header;
u8 version_supported;
} __packed;
/* Offer Channel parameters */
struct vmbus_channel_offer_channel {
struct vmbus_channel_message_header header;
struct vmbus_channel_offer offer;
u32 child_relid;
u8 monitorid;
/*
* win7 and beyond splits this field into a bit field.
*/
u8 monitor_allocated:1;
u8 reserved:7;
/*
* These are new fields added in win7 and later.
* Do not access these fields without checking the
* negotiated protocol.
*
* If "is_dedicated_interrupt" is set, we must not set the
* associated bit in the channel bitmap while sending the
* interrupt to the host.
*
* connection_id is to be used in signaling the host.
*/
u16 is_dedicated_interrupt:1;
u16 reserved1:15;
u32 connection_id;
} __packed;
/* Rescind Offer parameters */
struct vmbus_channel_rescind_offer {
struct vmbus_channel_message_header header;
u32 child_relid;
} __packed;
/*
* Request Offer -- no parameters, SynIC message contains the partition ID
* Set Snoop -- no parameters, SynIC message contains the partition ID
* Clear Snoop -- no parameters, SynIC message contains the partition ID
* All Offers Delivered -- no parameters, SynIC message contains the partition
* ID
* Flush Client -- no parameters, SynIC message contains the partition ID
*/
/* Open Channel parameters */
struct vmbus_channel_open_channel {
struct vmbus_channel_message_header header;
/* Identifies the specific VMBus channel that is being opened. */
u32 child_relid;
/* ID making a particular open request at a channel offer unique. */
u32 openid;
/* GPADL for the channel's ring buffer. */
u32 ringbuffer_gpadlhandle;
/*
* Starting with win8, this field will be used to specify
* the target virtual processor on which to deliver the interrupt for
* the host to guest communication.
* Prior to win8, incoming channel interrupts would only
* be delivered on cpu 0. Setting this value to 0 would
* preserve the earlier behavior.
*/
u32 target_vp;
/*
* The upstream ring buffer begins at offset zero in the memory
* described by RingBufferGpadlHandle. The downstream ring buffer
* follows it at this offset (in pages).
*/
u32 downstream_ringbuffer_pageoffset;
/* User-specific data to be passed along to the server endpoint. */
unsigned char userdata[MAX_USER_DEFINED_BYTES];
} __packed;
/* Open Channel Result parameters */
struct vmbus_channel_open_result {
struct vmbus_channel_message_header header;
u32 child_relid;
u32 openid;
u32 status;
} __packed;
/* Close channel parameters; */
struct vmbus_channel_close_channel {
struct vmbus_channel_message_header header;
u32 child_relid;
} __packed;
/* Channel Message GPADL */
#define GPADL_TYPE_RING_BUFFER 1
#define GPADL_TYPE_SERVER_SAVE_AREA 2
#define GPADL_TYPE_TRANSACTION 8
/*
* The number of PFNs in a GPADL message is defined by the number of
* pages that would be spanned by ByteCount and ByteOffset. If the
* implied number of PFNs won't fit in this packet, there will be a
* follow-up packet that contains more.
*/
struct vmbus_channel_gpadl_header {
struct vmbus_channel_message_header header;
u32 child_relid;
u32 gpadl;
u16 range_buflen;
u16 rangecount;
struct gpa_range range[0];
} __packed;
/* This is the followup packet that contains more PFNs. */
struct vmbus_channel_gpadl_body {
struct vmbus_channel_message_header header;
u32 msgnumber;
u32 gpadl;
u64 pfn[0];
} __packed;
struct vmbus_channel_gpadl_created {
struct vmbus_channel_message_header header;
u32 child_relid;
u32 gpadl;
u32 creation_status;
} __packed;
struct vmbus_channel_gpadl_teardown {
struct vmbus_channel_message_header header;
u32 child_relid;
u32 gpadl;
} __packed;
struct vmbus_channel_gpadl_torndown {
struct vmbus_channel_message_header header;
u32 gpadl;
} __packed;
struct vmbus_channel_relid_released {
struct vmbus_channel_message_header header;
u32 child_relid;
} __packed;
struct vmbus_channel_initiate_contact {
struct vmbus_channel_message_header header;
u32 vmbus_version_requested;
u32 target_vcpu; /* The VCPU the host should respond to */
u64 interrupt_page;
u64 monitor_page1;
u64 monitor_page2;
} __packed;
/* Hyper-V socket: guest's connect()-ing to host */
struct vmbus_channel_tl_connect_request {
struct vmbus_channel_message_header header;
uuid_le guest_endpoint_id;
uuid_le host_service_id;
} __packed;
struct vmbus_channel_version_response {
struct vmbus_channel_message_header header;
u8 version_supported;
} __packed;
enum vmbus_channel_state {
CHANNEL_OFFER_STATE,
CHANNEL_OPENING_STATE,
CHANNEL_OPEN_STATE,
CHANNEL_OPENED_STATE,
};
/*
* Represents each channel msg on the vmbus connection This is a
* variable-size data structure depending on the msg type itself
*/
struct vmbus_channel_msginfo {
/* Bookkeeping stuff */
struct list_head msglistentry;
/* So far, this is only used to handle gpadl body message */
struct list_head submsglist;
/* Synchronize the request/response if needed */
struct completion waitevent;
union {
struct vmbus_channel_version_supported version_supported;
struct vmbus_channel_open_result open_result;
struct vmbus_channel_gpadl_torndown gpadl_torndown;
struct vmbus_channel_gpadl_created gpadl_created;
struct vmbus_channel_version_response version_response;
} response;
u32 msgsize;
/*
* The channel message that goes out on the "wire".
* It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
*/
unsigned char msg[0];
};
struct vmbus_close_msg {
struct vmbus_channel_msginfo info;
struct vmbus_channel_close_channel msg;
};
/* Define connection identifier type. */
union hv_connection_id {
u32 asu32;
struct {
u32 id:24;
u32 reserved:8;
} u;
};
/* Definition of the hv_signal_event hypercall input structure. */
struct hv_input_signal_event {
union hv_connection_id connectionid;
u16 flag_number;
u16 rsvdz;
};
struct hv_input_signal_event_buffer {
u64 align8;
struct hv_input_signal_event event;
};
enum hv_signal_policy {
HV_SIGNAL_POLICY_DEFAULT = 0,
HV_SIGNAL_POLICY_EXPLICIT,
};
enum hv_numa_policy {
HV_BALANCED = 0,
HV_LOCALIZED,
};
enum vmbus_device_type {
HV_IDE = 0,
HV_SCSI,
HV_FC,
HV_NIC,
HV_ND,
HV_PCIE,
HV_FB,
HV_KBD,
HV_MOUSE,
HV_KVP,
HV_TS,
HV_HB,
HV_SHUTDOWN,
HV_FCOPY,
HV_BACKUP,
HV_DM,
HV_UNKOWN,
};
struct vmbus_device {
u16 dev_type;
uuid_le guid;
bool perf_device;
};
struct vmbus_channel {
struct list_head listentry;
struct hv_device *device_obj;
enum vmbus_channel_state state;
struct vmbus_channel_offer_channel offermsg;
/*
* These are based on the OfferMsg.MonitorId.
* Save it here for easy access.
*/
u8 monitor_grp;
u8 monitor_bit;
bool rescind; /* got rescind msg */
u32 ringbuffer_gpadlhandle;
/* Allocated memory for ring buffer */
void *ringbuffer_pages;
u32 ringbuffer_pagecount;
struct hv_ring_buffer_info outbound; /* send to parent */
struct hv_ring_buffer_info inbound; /* receive from parent */
spinlock_t inbound_lock;
struct vmbus_close_msg close_msg;
/* Channel callback are invoked in this workqueue context */
/* HANDLE dataWorkQueue; */
void (*onchannel_callback)(void *context);
void *channel_callback_context;
/*
* A channel can be marked for efficient (batched)
* reading:
* If batched_reading is set to "true", we read until the
* channel is empty and hold off interrupts from the host
* during the entire read process.
* If batched_reading is set to "false", the client is not
* going to perform batched reading.
*
* By default we will enable batched reading; specific
* drivers that don't want this behavior can turn it off.
*/
bool batched_reading;
bool is_dedicated_interrupt;
struct hv_input_signal_event_buffer sig_buf;
struct hv_input_signal_event *sig_event;
/*
* Starting with win8, this field will be used to specify
* the target virtual processor on which to deliver the interrupt for
* the host to guest communication.
* Prior to win8, incoming channel interrupts would only
* be delivered on cpu 0. Setting this value to 0 would
* preserve the earlier behavior.
*/
u32 target_vp;
/* The corresponding CPUID in the guest */
u32 target_cpu;
/*
* State to manage the CPU affiliation of channels.
*/
struct cpumask alloced_cpus_in_node;
int numa_node;
/*
* Support for sub-channels. For high performance devices,
* it will be useful to have multiple sub-channels to support
* a scalable communication infrastructure with the host.
* The support for sub-channels is implemented as an extention
* to the current infrastructure.
* The initial offer is considered the primary channel and this
* offer message will indicate if the host supports sub-channels.
* The guest is free to ask for sub-channels to be offerred and can
* open these sub-channels as a normal "primary" channel. However,
* all sub-channels will have the same type and instance guids as the
* primary channel. Requests sent on a given channel will result in a
* response on the same channel.
*/
/*
* Sub-channel creation callback. This callback will be called in
* process context when a sub-channel offer is received from the host.
* The guest can open the sub-channel in the context of this callback.
*/
void (*sc_creation_callback)(struct vmbus_channel *new_sc);
/*
* Channel rescind callback. Some channels (the hvsock ones), need to
* register a callback which is invoked in vmbus_onoffer_rescind().
*/
void (*chn_rescind_callback)(struct vmbus_channel *channel);
/*
* The spinlock to protect the structure. It is being used to protect
* test-and-set access to various attributes of the structure as well
* as all sc_list operations.
*/
spinlock_t lock;
/*
* All Sub-channels of a primary channel are linked here.
*/
struct list_head sc_list;
/*
* Current number of sub-channels.
*/
int num_sc;
/*
* Number of a sub-channel (position within sc_list) which is supposed
* to be used as the next outgoing channel.
*/
int next_oc;
/*
* The primary channel this sub-channel belongs to.
* This will be NULL for the primary channel.
*/
struct vmbus_channel *primary_channel;
/*
* Support per-channel state for use by vmbus drivers.
*/
void *per_channel_state;
/*
* To support per-cpu lookup mapping of relid to channel,
* link up channels based on their CPU affinity.
*/
struct list_head percpu_list;
/*
* Host signaling policy: The default policy will be
* based on the ring buffer state. We will also support
* a policy where the client driver can have explicit
* signaling control.
*/
enum hv_signal_policy signal_policy;
/*
* On the channel send side, many of the VMBUS
* device drivers explicity serialize access to the
* outgoing ring buffer. Give more control to the
* VMBUS device drivers in terms how to serialize
* accesss to the outgoing ring buffer.
* The default behavior will be to aquire the
* ring lock to preserve the current behavior.
*/
bool acquire_ring_lock;
/*
* For performance critical channels (storage, networking
* etc,), Hyper-V has a mechanism to enhance the throughput
* at the expense of latency:
* When the host is to be signaled, we just set a bit in a shared page
* and this bit will be inspected by the hypervisor within a certain
* window and if the bit is set, the host will be signaled. The window
* of time is the monitor latency - currently around 100 usecs. This
* mechanism improves throughput by:
*
* A) Making the host more efficient - each time it wakes up,
* potentially it will process morev number of packets. The
* monitor latency allows a batch to build up.
* B) By deferring the hypercall to signal, we will also minimize
* the interrupts.
*
* Clearly, these optimizations improve throughput at the expense of
* latency. Furthermore, since the channel is shared for both
* control and data messages, control messages currently suffer
* unnecessary latency adversley impacting performance and boot
* time. To fix this issue, permit tagging the channel as being
* in "low latency" mode. In this mode, we will bypass the monitor
* mechanism.
*/
bool low_latency;
/*
* NUMA distribution policy:
* We support teo policies:
* 1) Balanced: Here all performance critical channels are
* distributed evenly amongst all the NUMA nodes.
* This policy will be the default policy.
* 2) Localized: All channels of a given instance of a
* performance critical service will be assigned CPUs
* within a selected NUMA node.
*/
enum hv_numa_policy affinity_policy;
};
static inline void set_channel_lock_state(struct vmbus_channel *c, bool state)
{
c->acquire_ring_lock = state;
}
static inline bool is_hvsock_channel(const struct vmbus_channel *c)
{
return !!(c->offermsg.offer.chn_flags &
VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER);
}
static inline void set_channel_signal_state(struct vmbus_channel *c,
enum hv_signal_policy policy)
{
c->signal_policy = policy;
}
static inline void set_channel_affinity_state(struct vmbus_channel *c,
enum hv_numa_policy policy)
{
c->affinity_policy = policy;
}
static inline void set_channel_read_state(struct vmbus_channel *c, bool state)
{
c->batched_reading = state;
}
static inline void set_per_channel_state(struct vmbus_channel *c, void *s)
{
c->per_channel_state = s;
}
static inline void *get_per_channel_state(struct vmbus_channel *c)
{
return c->per_channel_state;
}
static inline void set_channel_pending_send_size(struct vmbus_channel *c,
u32 size)
{
c->outbound.ring_buffer->pending_send_sz = size;
}
static inline void set_low_latency_mode(struct vmbus_channel *c)
{
c->low_latency = true;
}
static inline void clear_low_latency_mode(struct vmbus_channel *c)
{
c->low_latency = false;
}
void vmbus_onmessage(void *context);
int vmbus_request_offers(void);
/*
* APIs for managing sub-channels.
*/
void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
void (*sc_cr_cb)(struct vmbus_channel *new_sc));
void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
void (*chn_rescind_cb)(struct vmbus_channel *));
/*
* Retrieve the (sub) channel on which to send an outgoing request.
* When a primary channel has multiple sub-channels, we choose a
* channel whose VCPU binding is closest to the VCPU on which
* this call is being made.
*/
struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary);
/*
* Check if sub-channels have already been offerred. This API will be useful
* when the driver is unloaded after establishing sub-channels. In this case,
* when the driver is re-loaded, the driver would have to check if the
* subchannels have already been established before attempting to request
* the creation of sub-channels.
* This function returns TRUE to indicate that subchannels have already been
* created.
* This function should be invoked after setting the callback function for
* sub-channel creation.
*/
bool vmbus_are_subchannels_present(struct vmbus_channel *primary);
/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_channel_packet_page_buffer {
u16 type;
u16 dataoffset8;
u16 length8;
u16 flags;
u64 transactionid;
u32 reserved;
u32 rangecount;
struct hv_page_buffer range[MAX_PAGE_BUFFER_COUNT];
} __packed;
/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_channel_packet_multipage_buffer {
u16 type;
u16 dataoffset8;
u16 length8;
u16 flags;
u64 transactionid;
u32 reserved;
u32 rangecount; /* Always 1 in this case */
struct hv_multipage_buffer range;
} __packed;
/* The format must be the same as struct vmdata_gpa_direct */
struct vmbus_packet_mpb_array {
u16 type;
u16 dataoffset8;
u16 length8;
u16 flags;
u64 transactionid;
u32 reserved;
u32 rangecount; /* Always 1 in this case */
struct hv_mpb_array range;
} __packed;
extern int vmbus_open(struct vmbus_channel *channel,
u32 send_ringbuffersize,
u32 recv_ringbuffersize,
void *userdata,
u32 userdatalen,
void(*onchannel_callback)(void *context),
void *context);
extern void vmbus_close(struct vmbus_channel *channel);
extern int vmbus_sendpacket(struct vmbus_channel *channel,
void *buffer,
u32 bufferLen,
u64 requestid,
enum vmbus_packet_type type,
u32 flags);
extern int vmbus_sendpacket_ctl(struct vmbus_channel *channel,
void *buffer,
u32 bufferLen,
u64 requestid,
enum vmbus_packet_type type,
u32 flags,
bool kick_q);
extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
struct hv_page_buffer pagebuffers[],
u32 pagecount,
void *buffer,
u32 bufferlen,
u64 requestid);
extern int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
struct hv_page_buffer pagebuffers[],
u32 pagecount,
void *buffer,
u32 bufferlen,
u64 requestid,
u32 flags,
bool kick_q);
extern int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
struct hv_multipage_buffer *mpb,
void *buffer,
u32 bufferlen,
u64 requestid);
extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
struct vmbus_packet_mpb_array *mpb,
u32 desc_size,
void *buffer,
u32 bufferlen,
u64 requestid);
extern int vmbus_establish_gpadl(struct vmbus_channel *channel,
void *kbuffer,
u32 size,
u32 *gpadl_handle);
extern int vmbus_teardown_gpadl(struct vmbus_channel *channel,
u32 gpadl_handle);
extern int vmbus_recvpacket(struct vmbus_channel *channel,
void *buffer,
u32 bufferlen,
u32 *buffer_actual_len,
u64 *requestid);
extern int vmbus_recvpacket_raw(struct vmbus_channel *channel,
void *buffer,
u32 bufferlen,
u32 *buffer_actual_len,
u64 *requestid);
extern void vmbus_ontimer(unsigned long data);
/* Base driver object */
struct hv_driver {
const char *name;
/*
* A hvsock offer, which has a VMBUS_CHANNEL_TLNPI_PROVIDER_OFFER
* channel flag, actually doesn't mean a synthetic device because the
* offer's if_type/if_instance can change for every new hvsock
* connection.
*
* However, to facilitate the notification of new-offer/rescind-offer
* from vmbus driver to hvsock driver, we can handle hvsock offer as
* a special vmbus device, and hence we need the below flag to
* indicate if the driver is the hvsock driver or not: we need to
* specially treat the hvosck offer & driver in vmbus_match().
*/
bool hvsock;
/* the device type supported by this driver */
uuid_le dev_type;
const struct hv_vmbus_device_id *id_table;
struct device_driver driver;
int (*probe)(struct hv_device *, const struct hv_vmbus_device_id *);
int (*remove)(struct hv_device *);
void (*shutdown)(struct hv_device *);
};
/* Base device object */
struct hv_device {
/* the device type id of this device */
uuid_le dev_type;
/* the device instance id of this device */
uuid_le dev_instance;
u16 vendor_id;
u16 device_id;
struct device device;
struct vmbus_channel *channel;
};
static inline struct hv_device *device_to_hv_device(struct device *d)
{
return container_of(d, struct hv_device, device);
}
static inline struct hv_driver *drv_to_hv_drv(struct device_driver *d)
{
return container_of(d, struct hv_driver, driver);
}
static inline void hv_set_drvdata(struct hv_device *dev, void *data)
{
dev_set_drvdata(&dev->device, data);
}
static inline void *hv_get_drvdata(struct hv_device *dev)
{
return dev_get_drvdata(&dev->device);
}
/* Vmbus interface */
#define vmbus_driver_register(driver) \
__vmbus_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
int __must_check __vmbus_driver_register(struct hv_driver *hv_driver,
struct module *owner,
const char *mod_name);
void vmbus_driver_unregister(struct hv_driver *hv_driver);
void vmbus_hvsock_device_unregister(struct vmbus_channel *channel);
int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
resource_size_t min, resource_size_t max,
resource_size_t size, resource_size_t align,
bool fb_overlap_ok);
void vmbus_free_mmio(resource_size_t start, resource_size_t size);
int vmbus_cpu_number_to_vp_number(int cpu_number);
u64 hv_do_hypercall(u64 control, void *input, void *output);
/*
* GUID definitions of various offer types - services offered to the guest.
*/
/*
* Network GUID
* {f8615163-df3e-46c5-913f-f2d2f965ed0e}
*/
#define HV_NIC_GUID \
.guid = UUID_LE(0xf8615163, 0xdf3e, 0x46c5, 0x91, 0x3f, \
0xf2, 0xd2, 0xf9, 0x65, 0xed, 0x0e)
/*
* IDE GUID
* {32412632-86cb-44a2-9b5c-50d1417354f5}
*/
#define HV_IDE_GUID \
.guid = UUID_LE(0x32412632, 0x86cb, 0x44a2, 0x9b, 0x5c, \
0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5)
/*
* SCSI GUID
* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}
*/
#define HV_SCSI_GUID \
.guid = UUID_LE(0xba6163d9, 0x04a1, 0x4d29, 0xb6, 0x05, \
0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f)
/*
* Shutdown GUID
* {0e0b6031-5213-4934-818b-38d90ced39db}
*/
#define HV_SHUTDOWN_GUID \
.guid = UUID_LE(0x0e0b6031, 0x5213, 0x4934, 0x81, 0x8b, \
0x38, 0xd9, 0x0c, 0xed, 0x39, 0xdb)
/*
* Time Synch GUID
* {9527E630-D0AE-497b-ADCE-E80AB0175CAF}
*/
#define HV_TS_GUID \
.guid = UUID_LE(0x9527e630, 0xd0ae, 0x497b, 0xad, 0xce, \
0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf)
/*
* Heartbeat GUID
* {57164f39-9115-4e78-ab55-382f3bd5422d}
*/
#define HV_HEART_BEAT_GUID \
.guid = UUID_LE(0x57164f39, 0x9115, 0x4e78, 0xab, 0x55, \
0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d)
/*
* KVP GUID
* {a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}
*/
#define HV_KVP_GUID \
.guid = UUID_LE(0xa9a0f4e7, 0x5a45, 0x4d96, 0xb8, 0x27, \
0x8a, 0x84, 0x1e, 0x8c, 0x03, 0xe6)
/*
* Dynamic memory GUID
* {525074dc-8985-46e2-8057-a307dc18a502}
*/
#define HV_DM_GUID \
.guid = UUID_LE(0x525074dc, 0x8985, 0x46e2, 0x80, 0x57, \
0xa3, 0x07, 0xdc, 0x18, 0xa5, 0x02)
/*
* Mouse GUID
* {cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}
*/
#define HV_MOUSE_GUID \
.guid = UUID_LE(0xcfa8b69e, 0x5b4a, 0x4cc0, 0xb9, 0x8b, \
0x8b, 0xa1, 0xa1, 0xf3, 0xf9, 0x5a)
/*
* Keyboard GUID
* {f912ad6d-2b17-48ea-bd65-f927a61c7684}
*/
#define HV_KBD_GUID \
.guid = UUID_LE(0xf912ad6d, 0x2b17, 0x48ea, 0xbd, 0x65, \
0xf9, 0x27, 0xa6, 0x1c, 0x76, 0x84)
/*
* VSS (Backup/Restore) GUID
*/
#define HV_VSS_GUID \
.guid = UUID_LE(0x35fa2e29, 0xea23, 0x4236, 0x96, 0xae, \
0x3a, 0x6e, 0xba, 0xcb, 0xa4, 0x40)
/*
* Synthetic Video GUID
* {DA0A7802-E377-4aac-8E77-0558EB1073F8}
*/
#define HV_SYNTHVID_GUID \
.guid = UUID_LE(0xda0a7802, 0xe377, 0x4aac, 0x8e, 0x77, \
0x05, 0x58, 0xeb, 0x10, 0x73, 0xf8)
/*
* Synthetic FC GUID
* {2f9bcc4a-0069-4af3-b76b-6fd0be528cda}
*/
#define HV_SYNTHFC_GUID \
.guid = UUID_LE(0x2f9bcc4a, 0x0069, 0x4af3, 0xb7, 0x6b, \
0x6f, 0xd0, 0xbe, 0x52, 0x8c, 0xda)
/*
* Guest File Copy Service
* {34D14BE3-DEE4-41c8-9AE7-6B174977C192}
*/
#define HV_FCOPY_GUID \
.guid = UUID_LE(0x34d14be3, 0xdee4, 0x41c8, 0x9a, 0xe7, \
0x6b, 0x17, 0x49, 0x77, 0xc1, 0x92)
/*
* NetworkDirect. This is the guest RDMA service.
* {8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501}
*/
#define HV_ND_GUID \
.guid = UUID_LE(0x8c2eaf3d, 0x32a7, 0x4b09, 0xab, 0x99, \
0xbd, 0x1f, 0x1c, 0x86, 0xb5, 0x01)
/*
* PCI Express Pass Through
* {44C4F61D-4444-4400-9D52-802E27EDE19F}
*/
#define HV_PCIE_GUID \
.guid = UUID_LE(0x44c4f61d, 0x4444, 0x4400, 0x9d, 0x52, \
0x80, 0x2e, 0x27, 0xed, 0xe1, 0x9f)
/*
* Linux doesn't support the 3 devices: the first two are for
* Automatic Virtual Machine Activation, and the third is for
* Remote Desktop Virtualization.
* {f8e65716-3cb3-4a06-9a60-1889c5cccab5}
* {3375baf4-9e15-4b30-b765-67acb10d607b}
* {276aacf4-ac15-426c-98dd-7521ad3f01fe}
*/
#define HV_AVMA1_GUID \
.guid = UUID_LE(0xf8e65716, 0x3cb3, 0x4a06, 0x9a, 0x60, \
0x18, 0x89, 0xc5, 0xcc, 0xca, 0xb5)
#define HV_AVMA2_GUID \
.guid = UUID_LE(0x3375baf4, 0x9e15, 0x4b30, 0xb7, 0x65, \
0x67, 0xac, 0xb1, 0x0d, 0x60, 0x7b)
#define HV_RDV_GUID \
.guid = UUID_LE(0x276aacf4, 0xac15, 0x426c, 0x98, 0xdd, \
0x75, 0x21, 0xad, 0x3f, 0x01, 0xfe)
/*
* Common header for Hyper-V ICs
*/
#define ICMSGTYPE_NEGOTIATE 0
#define ICMSGTYPE_HEARTBEAT 1
#define ICMSGTYPE_KVPEXCHANGE 2
#define ICMSGTYPE_SHUTDOWN 3
#define ICMSGTYPE_TIMESYNC 4
#define ICMSGTYPE_VSS 5
#define ICMSGHDRFLAG_TRANSACTION 1
#define ICMSGHDRFLAG_REQUEST 2
#define ICMSGHDRFLAG_RESPONSE 4
/*
* While we want to handle util services as regular devices,
* there is only one instance of each of these services; so
* we statically allocate the service specific state.
*/
struct hv_util_service {
u8 *recv_buffer;
void *channel;
void (*util_cb)(void *);
int (*util_init)(struct hv_util_service *);
void (*util_deinit)(void);
};
struct vmbuspipe_hdr {
u32 flags;
u32 msgsize;
} __packed;
struct ic_version {
u16 major;
u16 minor;
} __packed;
struct icmsg_hdr {
struct ic_version icverframe;
u16 icmsgtype;
struct ic_version icvermsg;
u16 icmsgsize;
u32 status;
u8 ictransaction_id;
u8 icflags;
u8 reserved[2];
} __packed;
struct icmsg_negotiate {
u16 icframe_vercnt;
u16 icmsg_vercnt;
u32 reserved;
struct ic_version icversion_data[1]; /* any size array */
} __packed;
struct shutdown_msg_data {
u32 reason_code;
u32 timeout_seconds;
u32 flags;
u8 display_message[2048];
} __packed;
struct heartbeat_msg_data {
u64 seq_num;
u32 reserved[8];
} __packed;
/* Time Sync IC defs */
#define ICTIMESYNCFLAG_PROBE 0
#define ICTIMESYNCFLAG_SYNC 1
#define ICTIMESYNCFLAG_SAMPLE 2
#ifdef __x86_64__
#define WLTIMEDELTA 116444736000000000L /* in 100ns unit */
#else
#define WLTIMEDELTA 116444736000000000LL
#endif
struct ictimesync_data {
u64 parenttime;
u64 childtime;
u64 roundtriptime;
u8 flags;
} __packed;
struct ictimesync_ref_data {
u64 parenttime;
u64 vmreferencetime;
u8 flags;
char leapflags;
char stratum;
u8 reserved[3];
} __packed;
struct hyperv_service_callback {
u8 msg_type;
char *log_msg;
uuid_le data;
struct vmbus_channel *channel;
void (*callback) (void *context);
};
#define MAX_SRV_VER 0x7ffffff
extern bool vmbus_prep_negotiate_resp(struct icmsg_hdr *,
struct icmsg_negotiate *, u8 *, int,
int);
void hv_event_tasklet_disable(struct vmbus_channel *channel);
void hv_event_tasklet_enable(struct vmbus_channel *channel);
void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid);
/*
* Negotiated version with the Host.
*/
extern __u32 vmbus_proto_version;
int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id,
const uuid_le *shv_host_servie_id);
void vmbus_set_event(struct vmbus_channel *channel);
/* Get the start of the ring buffer. */
static inline void *
hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info)
{
return (void *)ring_info->ring_buffer->buffer;
}
/*
* To optimize the flow management on the send-side,
* when the sender is blocked because of lack of
* sufficient space in the ring buffer, potential the
* consumer of the ring buffer can signal the producer.
* This is controlled by the following parameters:
*
* 1. pending_send_sz: This is the size in bytes that the
* producer is trying to send.
* 2. The feature bit feat_pending_send_sz set to indicate if
* the consumer of the ring will signal when the ring
* state transitions from being full to a state where
* there is room for the producer to send the pending packet.
*/
static inline bool hv_need_to_signal_on_read(struct hv_ring_buffer_info *rbi)
{
u32 cur_write_sz;
u32 pending_sz;
/*
* Issue a full memory barrier before making the signaling decision.
* Here is the reason for having this barrier:
* If the reading of the pend_sz (in this function)
* were to be reordered and read before we commit the new read
* index (in the calling function) we could
* have a problem. If the host were to set the pending_sz after we
* have sampled pending_sz and go to sleep before we commit the
* read index, we could miss sending the interrupt. Issue a full
* memory barrier to address this.
*/
virt_mb();
pending_sz = READ_ONCE(rbi->ring_buffer->pending_send_sz);
/* If the other end is not blocked on write don't bother. */
if (pending_sz == 0)
return false;
cur_write_sz = hv_get_bytes_to_write(rbi);
if (cur_write_sz >= pending_sz)
return true;
return false;
}
/*
* An API to support in-place processing of incoming VMBUS packets.
*/
#define VMBUS_PKT_TRAILER 8
static inline struct vmpacket_descriptor *
get_next_pkt_raw(struct vmbus_channel *channel)
{
struct hv_ring_buffer_info *ring_info = &channel->inbound;
u32 read_loc = ring_info->priv_read_index;
void *ring_buffer = hv_get_ring_buffer(ring_info);
struct vmpacket_descriptor *cur_desc;
u32 packetlen;
u32 dsize = ring_info->ring_datasize;
u32 delta = read_loc - ring_info->ring_buffer->read_index;
u32 bytes_avail_toread = (hv_get_bytes_to_read(ring_info) - delta);
if (bytes_avail_toread < sizeof(struct vmpacket_descriptor))
return NULL;
if ((read_loc + sizeof(*cur_desc)) > dsize)
return NULL;
cur_desc = ring_buffer + read_loc;
packetlen = cur_desc->len8 << 3;
/*
* If the packet under consideration is wrapping around,
* return failure.
*/
if ((read_loc + packetlen + VMBUS_PKT_TRAILER) > (dsize - 1))
return NULL;
return cur_desc;
}
/*
* A helper function to step through packets "in-place"
* This API is to be called after each successful call
* get_next_pkt_raw().
*/
static inline void put_pkt_raw(struct vmbus_channel *channel,
struct vmpacket_descriptor *desc)
{
struct hv_ring_buffer_info *ring_info = &channel->inbound;
u32 read_loc = ring_info->priv_read_index;
u32 packetlen = desc->len8 << 3;
u32 dsize = ring_info->ring_datasize;
if ((read_loc + packetlen + VMBUS_PKT_TRAILER) > dsize)
BUG();
/*
* Include the packet trailer.
*/
ring_info->priv_read_index += packetlen + VMBUS_PKT_TRAILER;
}
/*
* This call commits the read index and potentially signals the host.
* Here is the pattern for using the "in-place" consumption APIs:
*
* while (get_next_pkt_raw() {
* process the packet "in-place";
* put_pkt_raw();
* }
* if (packets processed in place)
* commit_rd_index();
*/
static inline void commit_rd_index(struct vmbus_channel *channel)
{
struct hv_ring_buffer_info *ring_info = &channel->inbound;
/*
* Make sure all reads are done before we update the read index since
* the writer may start writing to the read area once the read index
* is updated.
*/
virt_rmb();
ring_info->ring_buffer->read_index = ring_info->priv_read_index;
if (hv_need_to_signal_on_read(ring_info))
vmbus_set_event(channel);
}
#endif /* _HYPERV_H */
