3 * Copyright (c) 2009, Microsoft Corporation.
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.
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
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.
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
25 #ifndef _CHANNEL_MGMT_H_
26 #define _CHANNEL_MGMT_H_
28 #include <linux/list.h>
29 #include <linux/timer.h>
30 #include <linux/workqueue.h>
31 #include <linux/completion.h>
34 /* Version 1 messages */
35 enum vmbus_channel_message_type {
36 CHANNELMSG_INVALID = 0,
37 CHANNELMSG_OFFERCHANNEL = 1,
38 CHANNELMSG_RESCIND_CHANNELOFFER = 2,
39 CHANNELMSG_REQUESTOFFERS = 3,
40 CHANNELMSG_ALLOFFERS_DELIVERED = 4,
41 CHANNELMSG_OPENCHANNEL = 5,
42 CHANNELMSG_OPENCHANNEL_RESULT = 6,
43 CHANNELMSG_CLOSECHANNEL = 7,
44 CHANNELMSG_GPADL_HEADER = 8,
45 CHANNELMSG_GPADL_BODY = 9,
46 CHANNELMSG_GPADL_CREATED = 10,
47 CHANNELMSG_GPADL_TEARDOWN = 11,
48 CHANNELMSG_GPADL_TORNDOWN = 12,
49 CHANNELMSG_RELID_RELEASED = 13,
50 CHANNELMSG_INITIATE_CONTACT = 14,
51 CHANNELMSG_VERSION_RESPONSE = 15,
52 CHANNELMSG_UNLOAD = 16,
53 #ifdef VMBUS_FEATURE_PARENT_OR_PEER_MEMORY_MAPPED_INTO_A_CHILD
54 CHANNELMSG_VIEWRANGE_ADD = 17,
55 CHANNELMSG_VIEWRANGE_REMOVE = 18,
60 struct vmbus_channel_message_header {
61 enum vmbus_channel_message_type msgtype;
65 /* Query VMBus Version parameters */
66 struct vmbus_channel_query_vmbus_version {
67 struct vmbus_channel_message_header header;
71 /* VMBus Version Supported parameters */
72 struct vmbus_channel_version_supported {
73 struct vmbus_channel_message_header header;
74 bool version_supported;
77 /* Offer Channel parameters */
78 struct vmbus_channel_offer_channel {
79 struct vmbus_channel_message_header header;
80 struct vmbus_channel_offer offer;
83 bool monitor_allocated;
86 /* Rescind Offer parameters */
87 struct vmbus_channel_rescind_offer {
88 struct vmbus_channel_message_header header;
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
98 * Flush Client -- no parameters, SynIC message contains the partition ID
101 /* Open Channel parameters */
102 struct vmbus_channel_open_channel {
103 struct vmbus_channel_message_header header;
105 /* Identifies the specific VMBus channel that is being opened. */
108 /* ID making a particular open request at a channel offer unique. */
111 /* GPADL for the channel's ring buffer. */
112 u32 ringbuffer_gpadlhandle;
114 /* GPADL for the channel's server context save area. */
115 u32 server_contextarea_gpadlhandle;
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).
122 u32 downstream_ringbuffer_pageoffset;
124 /* User-specific data to be passed along to the server endpoint. */
125 unsigned char userdata[MAX_USER_DEFINED_BYTES];
128 /* Open Channel Result parameters */
129 struct vmbus_channel_open_result {
130 struct vmbus_channel_message_header header;
136 /* Close channel parameters; */
137 struct vmbus_channel_close_channel {
138 struct vmbus_channel_message_header header;
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
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.
153 struct vmbus_channel_gpadl_header {
154 struct vmbus_channel_message_header header;
159 struct gpa_range range[0];
162 /* This is the followup packet that contains more PFNs. */
163 struct vmbus_channel_gpadl_body {
164 struct vmbus_channel_message_header header;
170 struct vmbus_channel_gpadl_created {
171 struct vmbus_channel_message_header header;
177 struct vmbus_channel_gpadl_teardown {
178 struct vmbus_channel_message_header header;
183 struct vmbus_channel_gpadl_torndown {
184 struct vmbus_channel_message_header header;
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 viewrange_base;
192 u64 viewrange_length;
196 struct vmbus_channel_view_range_remove {
197 struct vmbus_channel_message_header header;
198 PHYSICAL_ADDRESS viewrange_base;
203 struct vmbus_channel_relid_released {
204 struct vmbus_channel_message_header header;
208 struct vmbus_channel_initiate_contact {
209 struct vmbus_channel_message_header header;
210 u32 vmbus_version_requested;
217 struct vmbus_channel_version_response {
218 struct vmbus_channel_message_header header;
219 bool version_supported;
222 enum vmbus_channel_state {
224 CHANNEL_OPENING_STATE,
228 struct vmbus_channel {
229 struct list_head listentry;
231 struct hv_device *device_obj;
233 struct timer_list poll_timer; /* SA-111 workaround */
234 struct work_struct work;
236 enum vmbus_channel_state state;
238 struct vmbus_channel_offer_channel offermsg;
240 * These are based on the OfferMsg.MonitorId.
241 * Save it here for easy access.
246 u32 ringbuffer_gpadlhandle;
248 /* Allocated memory for ring buffer */
249 void *ringbuffer_pages;
250 u32 ringbuffer_pagecount;
251 struct hv_ring_buffer_info outbound; /* send to parent */
252 struct hv_ring_buffer_info inbound; /* receive from parent */
253 spinlock_t inbound_lock;
254 struct workqueue_struct *controlwq;
256 /* Channel callback are invoked in this workqueue context */
257 /* HANDLE dataWorkQueue; */
259 void (*onchannel_callback)(void *context);
260 void *channel_callback_context;
263 struct vmbus_channel_debug_info {
265 enum vmbus_channel_state state;
266 struct hv_guid interfacetype;
267 struct hv_guid interface_instance;
269 u32 servermonitor_pending;
270 u32 servermonitor_latency;
271 u32 servermonitor_connectionid;
272 u32 clientmonitor_pending;
273 u32 clientmonitor_latency;
274 u32 clientmonitor_connectionid;
276 struct hv_ring_buffer_debug_info inbound;
277 struct hv_ring_buffer_debug_info outbound;
281 * Represents each channel msg on the vmbus connection This is a
282 * variable-size data structure depending on the msg type itself
284 struct vmbus_channel_msginfo {
285 /* Bookkeeping stuff */
286 struct list_head msglistentry;
288 /* So far, this is only used to handle gpadl body message */
289 struct list_head submsglist;
291 /* Synchronize the request/response if needed */
292 struct completion waitevent;
294 struct vmbus_channel_version_supported version_supported;
295 struct vmbus_channel_open_result open_result;
296 struct vmbus_channel_gpadl_torndown gpadl_torndown;
297 struct vmbus_channel_gpadl_created gpadl_created;
298 struct vmbus_channel_version_response version_response;
303 * The channel message that goes out on the "wire".
304 * It will contain at minimum the VMBUS_CHANNEL_MESSAGE_HEADER header
306 unsigned char msg[0];
310 void free_channel(struct vmbus_channel *channel);
312 void vmbus_onmessage(void *context);
314 int vmbus_request_offers(void);
316 #endif /* _CHANNEL_MGMT_H_ */