drivers/staging/hv/ChannelMgmt.h

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24
  25 #ifndef _CHANNEL_MGMT_H_
  26 #define _CHANNEL_MGMT_H_
  27
  28 #include <linux/list.h>
  29 #include "RingBuffer.h"
  30 #include "VmbusChannelInterface.h"
  31 #include "VmbusPacketFormat.h"
  32
  33 /* Version 1 messages */
  34 enum vmbus_channel_message_type {
  35         ChannelMessageInvalid                   =  0,
  36         ChannelMessageOfferChannel              =  1,
  37         ChannelMessageRescindChannelOffer       =  2,
  38         ChannelMessageRequestOffers             =  3,
  39         ChannelMessageAllOffersDelivered        =  4,
  40         ChannelMessageOpenChannel               =  5,
  41         ChannelMessageOpenChannelResult         =  6,
  42         ChannelMessageCloseChannel              =  7,
  43         ChannelMessageGpadlHeader               =  8,
  44         ChannelMessageGpadlBody                 =  9,
  45         ChannelMessageGpadlCreated              = 10,
  46         ChannelMessageGpadlTeardown             = 11,
  47         ChannelMessageGpadlTorndown             = 12,
  48         ChannelMessageRelIdReleased             = 13,
  49         ChannelMessageInitiateContact           = 14,
  50         ChannelMessageVersionResponse           = 15,
  51         ChannelMessageUnload                    = 16,
  52 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
  53         ChannelMessageViewRangeAdd              = 17,
  54         ChannelMessageViewRangeRemove           = 18,
  55 #endif
  56         ChannelMessageCount
  57 } __attribute__((packed));
  58
  59 struct vmbus_channel_message_header {
  60         enum vmbus_channel_message_type MessageType;
  61         u32 Padding;
  62 } __attribute__((packed));
  63
  64 /* Query VMBus Version parameters */
  65 struct vmbus_channel_query_vmbus_version {
  66         struct vmbus_channel_message_header Header;
  67         u32 Version;
  68 } __attribute__((packed));
  69
  70 /* VMBus Version Supported parameters */
  71 struct vmbus_channel_version_supported {
  72         struct vmbus_channel_message_header Header;
  73         bool VersionSupported;
  74 } __attribute__((packed));
  75
  76 /* Offer Channel parameters */
  77 struct vmbus_channel_offer_channel {
  78         struct vmbus_channel_message_header Header;
  79         struct vmbus_channel_offer Offer;
  80         u32 ChildRelId;
  81         u8 MonitorId;
  82         bool MonitorAllocated;
  83 } __attribute__((packed));
  84
  85 /* Rescind Offer parameters */
  86 struct vmbus_channel_rescind_offer {
  87         struct vmbus_channel_message_header Header;
  88         u32 ChildRelId;
  89 } __attribute__((packed));
  90
  91 /*
  92  * Request Offer -- no parameters, SynIC message contains the partition ID
  93  * Set Snoop -- no parameters, SynIC message contains the partition ID
  94  * Clear Snoop -- no parameters, SynIC message contains the partition ID
  95  * All Offers Delivered -- no parameters, SynIC message contains the partition
  96  *                         ID
  97  * Flush Client -- no parameters, SynIC message contains the partition ID
  98  */
  99
 100 /* Open Channel parameters */
 101 struct vmbus_channel_open_channel {
 102         struct vmbus_channel_message_header Header;
 103
 104         /* Identifies the specific VMBus channel that is being opened. */
 105         u32 ChildRelId;
 106
 107         /* ID making a particular open request at a channel offer unique. */
 108         u32 OpenId;
 109
 110         /* GPADL for the channel's ring buffer. */
 111         u32 RingBufferGpadlHandle;
 112
 113         /* GPADL for the channel's server context save area. */
 114         u32 ServerContextAreaGpadlHandle;
 115
 116         /*
 117         * The upstream ring buffer begins at offset zero in the memory
 118         * described by RingBufferGpadlHandle. The downstream ring buffer
 119         * follows it at this offset (in pages).
 120         */
 121         u32 DownstreamRingBufferPageOffset;
 122
 123         /* User-specific data to be passed along to the server endpoint. */
 124         unsigned char UserData[MAX_USER_DEFINED_BYTES];
 125 } __attribute__((packed));
 126
 127 /* Open Channel Result parameters */
 128 struct vmbus_channel_open_result {
 129         struct vmbus_channel_message_header Header;
 130         u32 ChildRelId;
 131         u32 OpenId;
 132         u32 Status;
 133 } __attribute__((packed));
 134
 135 /* Close channel parameters; */
 136 struct vmbus_channel_close_channel {
 137         struct vmbus_channel_message_header Header;
 138         u32 ChildRelId;
 139 } __attribute__((packed));
 140
 141 /* Channel Message GPADL */
 142 #define GPADL_TYPE_RING_BUFFER          1
 143 #define GPADL_TYPE_SERVER_SAVE_AREA     2
 144 #define GPADL_TYPE_TRANSACTION          8
 145
 146 /*
 147  * The number of PFNs in a GPADL message is defined by the number of
 148  * pages that would be spanned by ByteCount and ByteOffset.  If the
 149  * implied number of PFNs won't fit in this packet, there will be a
 150  * follow-up packet that contains more.
 151  */
 152 struct vmbus_channel_gpadl_header {
 153         struct vmbus_channel_message_header Header;
 154         u32 ChildRelId;
 155         u32 Gpadl;
 156         u16 RangeBufLen;
 157         u16 RangeCount;
 158         struct gpa_range Range[0];
 159 } __attribute__((packed));
 160
 161 /* This is the followup packet that contains more PFNs. */
 162 struct vmbus_channel_gpadl_body {
 163         struct vmbus_channel_message_header Header;
 164         u32 MessageNumber;
 165         u32 Gpadl;
 166         u64 Pfn[0];
 167 } __attribute__((packed));
 168
 169 struct vmbus_channel_gpadl_created {
 170         struct vmbus_channel_message_header Header;
 171         u32 ChildRelId;
 172         u32 Gpadl;
 173         u32 CreationStatus;
 174 } __attribute__((packed));
 175
 176 struct vmbus_channel_gpadl_teardown {
 177         struct vmbus_channel_message_header Header;
 178         u32 ChildRelId;
 179         u32 Gpadl;
 180 } __attribute__((packed));
 181
 182 struct vmbus_channel_gpadl_torndown {
 183         struct vmbus_channel_message_header Header;
 184         u32 Gpadl;
 185 } __attribute__((packed));
 186
 187 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
 188 struct vmbus_channel_view_range_add {
 189         struct vmbus_channel_message_header Header;
 190         PHYSICAL_ADDRESS ViewRangeBase;
 191         u64 ViewRangeLength;
 192         u32 ChildRelId;
 193 } __attribute__((packed));
 194
 195 struct vmbus_channel_view_range_remove {
 196         struct vmbus_channel_message_header Header;
 197         PHYSICAL_ADDRESS ViewRangeBase;
 198         u32 ChildRelId;
 199 } __attribute__((packed));
 200 #endif
 201
 202 struct vmbus_channel_relid_released {
 203         struct vmbus_channel_message_header Header;
 204         u32 ChildRelId;
 205 } __attribute__((packed));
 206
 207 struct vmbus_channel_initiate_contact {
 208         struct vmbus_channel_message_header Header;
 209         u32 VMBusVersionRequested;
 210         u32 Padding2;
 211         u64 InterruptPage;
 212         u64 MonitorPage1;
 213         u64 MonitorPage2;
 214 } __attribute__((packed));
 215
 216 struct vmbus_channel_version_response {
 217         struct vmbus_channel_message_header Header;
 218         bool VersionSupported;
 219 } __attribute__((packed));
 220
 221 enum vmbus_channel_state {
 222         CHANNEL_OFFER_STATE,
 223         CHANNEL_OPENING_STATE,
 224         CHANNEL_OPEN_STATE,
 225 };
 226
 227 struct vmbus_channel {
 228         struct list_head ListEntry;
 229
 230         struct hv_device *DeviceObject;
 231
 232         struct timer_list poll_timer; /* SA-111 workaround */
 233
 234         enum vmbus_channel_state State;
 235
 236         struct vmbus_channel_offer_channel OfferMsg;
 237         /*
 238          * These are based on the OfferMsg.MonitorId.
 239          * Save it here for easy access.
 240          */
 241         u8 MonitorGroup;
 242         u8 MonitorBit;
 243
 244         u32 RingBufferGpadlHandle;
 245
 246         /* Allocated memory for ring buffer */
 247         void *RingBufferPages;
 248         u32 RingBufferPageCount;
 249         RING_BUFFER_INFO Outbound;      /* send to parent */
 250         RING_BUFFER_INFO Inbound;       /* receive from parent */
 251         spinlock_t inbound_lock;
 252         struct workqueue_struct *ControlWQ;
 253
 254         /* Channel callback are invoked in this workqueue context */
 255         /* HANDLE dataWorkQueue; */
 256
 257         void (*OnChannelCallback)(void *context);
 258         void *ChannelCallbackContext;
 259 };
 260
 261 struct vmbus_channel_debug_info {
 262         u32 RelId;
 263         enum vmbus_channel_state State;
 264         struct hv_guid InterfaceType;
 265         struct hv_guid InterfaceInstance;
 266         u32 MonitorId;
 267         u32 ServerMonitorPending;
 268         u32 ServerMonitorLatency;
 269         u32 ServerMonitorConnectionId;
 270         u32 ClientMonitorPending;
 271         u32 ClientMonitorLatency;
 272         u32 ClientMonitorConnectionId;
 273
 274         RING_BUFFER_DEBUG_INFO Inbound;
 275         RING_BUFFER_DEBUG_INFO Outbound;
 276 };
 277
 278 /*
 279  * Represents each channel msg on the vmbus connection This is a
 280  * variable-size data structure depending on the msg type itself
 281  */
 282 struct vmbus_channel_msginfo {
 283         /* Bookkeeping stuff */
 284         struct list_head MsgListEntry;
 285
 286         /* So far, this is only used to handle gpadl body message */
 287         struct list_head SubMsgList;
 288
 289         /* Synchronize the request/response if needed */
 290         struct osd_waitevent *WaitEvent;
 291
 292         union {
 293                 struct vmbus_channel_version_supported VersionSupported;
 294                 struct vmbus_channel_open_result OpenResult;
 295                 struct vmbus_channel_gpadl_torndown GpadlTorndown;
 296                 struct vmbus_channel_gpadl_created GpadlCreated;
 297                 struct vmbus_channel_version_response VersionResponse;
 298         } Response;
 299
 300         u32 MessageSize;
 301         /*
 302          * The channel message that goes out on the "wire".
 303          * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
 304          */
 305         unsigned char Msg[0];
 306 };
 307
 308
 309 struct vmbus_channel *AllocVmbusChannel(void);
 310
 311 void FreeVmbusChannel(struct vmbus_channel *Channel);
 312
 313 void VmbusOnChannelMessage(void *Context);
 314
 315 int VmbusChannelRequestOffers(void);
 316
 317 void VmbusChannelReleaseUnattachedChannels(void);
 318
 319 #endif /* _CHANNEL_MGMT_H_ */