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