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/*
*
* Copyright (c) 2009, 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>
*
*/
#ifndef _CHANNEL_MGMT_H_
#define _CHANNEL_MGMT_H_
#include <linux/list.h>
#include <linux/timer.h>
#include "ring_buffer.h"
#include "vmbus_channel_interface.h"
#include "vmbus_packet_format.h"
/* Version 1 messages */
enum vmbus_channel_message_type {
ChannelMessageInvalid = 0,
ChannelMessageOfferChannel = 1,
ChannelMessageRescindChannelOffer = 2,
ChannelMessageRequestOffers = 3,
ChannelMessageAllOffersDelivered = 4,
ChannelMessageOpenChannel = 5,
ChannelMessageOpenChannelResult = 6,
ChannelMessageCloseChannel = 7,
ChannelMessageGpadlHeader = 8,
ChannelMessageGpadlBody = 9,
ChannelMessageGpadlCreated = 10,
ChannelMessageGpadlTeardown = 11,
ChannelMessageGpadlTorndown = 12,
ChannelMessageRelIdReleased = 13,
ChannelMessageInitiateContact = 14,
ChannelMessageVersionResponse = 15,
ChannelMessageUnload = 16,
#ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
ChannelMessageViewRangeAdd = 17,
ChannelMessageViewRangeRemove = 18,
#endif
ChannelMessageCount
};
struct vmbus_channel_message_header {
enum vmbus_channel_message_type MessageType;
u32 Padding;
} __attribute__((packed));
/* Query VMBus Version parameters */
struct vmbus_channel_query_vmbus_version {
struct vmbus_channel_message_header Header;
u32 Version;
} __attribute__((packed));
/* VMBus Version Supported parameters */
struct vmbus_channel_version_supported {
struct vmbus_channel_message_header Header;
bool VersionSupported;
} __attribute__((packed));
/* Offer Channel parameters */
struct vmbus_channel_offer_channel {
struct vmbus_channel_message_header Header;
struct vmbus_channel_offer Offer;
u32 ChildRelId;
u8 MonitorId;
bool MonitorAllocated;
} __attribute__((packed));
/* Rescind Offer parameters */
struct vmbus_channel_rescind_offer {
struct vmbus_channel_message_header Header;
u32 ChildRelId;
} __attribute__((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 ChildRelId;
/* ID making a particular open request at a channel offer unique. */
u32 OpenId;
/* GPADL for the channel's ring buffer. */
u32 RingBufferGpadlHandle;
/* GPADL for the channel's server context save area. */
u32 ServerContextAreaGpadlHandle;
/*
* 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 DownstreamRingBufferPageOffset;
/* User-specific data to be passed along to the server endpoint. */
unsigned char UserData[MAX_USER_DEFINED_BYTES];
} __attribute__((packed));
/* Open Channel Result parameters */
struct vmbus_channel_open_result {
struct vmbus_channel_message_header Header;
u32 ChildRelId;
u32 OpenId;
u32 Status;
} __attribute__((packed));
/* Close channel parameters; */
struct vmbus_channel_close_channel {
struct vmbus_channel_message_header Header;
u32 ChildRelId;
} __attribute__((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 ChildRelId;
u32 Gpadl;
u16 RangeBufLen;
u16 RangeCount;
struct gpa_range Range[0];
} __attribute__((packed));
/* This is the followup packet that contains more PFNs. */
struct vmbus_channel_gpadl_body {
struct vmbus_channel_message_header Header;
u32 MessageNumber;
u32 Gpadl;
u64 Pfn[0];
} __attribute__((packed));
struct vmbus_channel_gpadl_created {
struct vmbus_channel_message_header Header;
u32 ChildRelId;
u32 Gpadl;
u32 CreationStatus;
} __attribute__((packed));
struct vmbus_channel_gpadl_teardown {
struct vmbus_channel_message_header Header;
u32 ChildRelId;
u32 Gpadl;
} __attribute__((packed));
struct vmbus_channel_gpadl_torndown {
struct vmbus_channel_message_header Header;
u32 Gpadl;
} __attribute__((packed));
#ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
struct vmbus_channel_view_range_add {
struct vmbus_channel_message_header Header;
PHYSICAL_ADDRESS ViewRangeBase;
u64 ViewRangeLength;
u32 ChildRelId;
} __attribute__((packed));
struct vmbus_channel_view_range_remove {
struct vmbus_channel_message_header Header;
PHYSICAL_ADDRESS ViewRangeBase;
u32 ChildRelId;
} __attribute__((packed));
#endif
struct vmbus_channel_relid_released {
struct vmbus_channel_message_header Header;
u32 ChildRelId;
} __attribute__((packed));
struct vmbus_channel_initiate_contact {
struct vmbus_channel_message_header Header;
u32 VMBusVersionRequested;
u32 Padding2;
u64 InterruptPage;
u64 MonitorPage1;
u64 MonitorPage2;
} __attribute__((packed));
struct vmbus_channel_version_response {
struct vmbus_channel_message_header Header;
bool VersionSupported;
} __attribute__((packed));
enum vmbus_channel_state {
CHANNEL_OFFER_STATE,
CHANNEL_OPENING_STATE,
CHANNEL_OPEN_STATE,
};
struct vmbus_channel {
struct list_head ListEntry;
struct hv_device *DeviceObject;
struct timer_list poll_timer; /* SA-111 workaround */
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 MonitorGroup;
u8 MonitorBit;
u32 RingBufferGpadlHandle;
/* Allocated memory for ring buffer */
void *RingBufferPages;
u32 RingBufferPageCount;
RING_BUFFER_INFO Outbound; /* send to parent */
RING_BUFFER_INFO Inbound; /* receive from parent */
spinlock_t inbound_lock;
struct workqueue_struct *ControlWQ;
/* Channel callback are invoked in this workqueue context */
/* HANDLE dataWorkQueue; */
void (*OnChannelCallback)(void *context);
void *ChannelCallbackContext;
};
struct vmbus_channel_debug_info {
u32 RelId;
enum vmbus_channel_state State;
struct hv_guid InterfaceType;
struct hv_guid InterfaceInstance;
u32 MonitorId;
u32 ServerMonitorPending;
u32 ServerMonitorLatency;
u32 ServerMonitorConnectionId;
u32 ClientMonitorPending;
u32 ClientMonitorLatency;
u32 ClientMonitorConnectionId;
RING_BUFFER_DEBUG_INFO Inbound;
RING_BUFFER_DEBUG_INFO Outbound;
};
/*
* Represents each channel msg on the vmbus connection This is a
* variable-size data structure depending on the msg type itself
*/
struct vmbus_channel_msginfo {
/* Bookkeeping stuff */
struct list_head MsgListEntry;
/* So far, this is only used to handle gpadl body message */
struct list_head SubMsgList;
/* Synchronize the request/response if needed */
struct osd_waitevent *WaitEvent;
union {
struct vmbus_channel_version_supported VersionSupported;
struct vmbus_channel_open_result OpenResult;
struct vmbus_channel_gpadl_torndown GpadlTorndown;
struct vmbus_channel_gpadl_created GpadlCreated;
struct vmbus_channel_version_response VersionResponse;
} Response;
u32 MessageSize;
/*
* 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_channel *AllocVmbusChannel(void);
void FreeVmbusChannel(struct vmbus_channel *Channel);
void VmbusOnChannelMessage(void *Context);
int VmbusChannelRequestOffers(void);
void VmbusChannelReleaseUnattachedChannels(void);
#endif /* _CHANNEL_MGMT_H_ */