Commit | Line | Data |
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3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
a0086dc5 | 23 | #include <linux/kernel.h> |
0c3b7b2f S |
24 | #include <linux/sched.h> |
25 | #include <linux/wait.h> | |
a0086dc5 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
53af545b | 28 | #include <linux/list.h> |
c88c4e4c | 29 | #include <linux/module.h> |
8b5d6d3b | 30 | #include <linux/completion.h> |
46a97191 | 31 | #include <linux/hyperv.h> |
3f335ea2 | 32 | |
0f2a6619 | 33 | #include "hyperv_vmbus.h" |
3e7ee490 | 34 | |
1d7e907f | 35 | struct vmbus_channel_message_table_entry { |
cf9dcba7 | 36 | enum vmbus_channel_message_type message_type; |
fa90f1de | 37 | void (*message_handler)(struct vmbus_channel_message_header *msg); |
1d7e907f | 38 | }; |
3e7ee490 | 39 | |
c88c4e4c HJ |
40 | |
41 | /** | |
da0e9631 | 42 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
43 | * @icmsghdrp: Pointer to msg header structure |
44 | * @icmsg_negotiate: Pointer to negotiate message structure | |
45 | * @buf: Raw buffer channel data | |
46 | * | |
47 | * @icmsghdrp is of type &struct icmsg_hdr. | |
48 | * @negop is of type &struct icmsg_negotiate. | |
c836d0ab S |
49 | * Set up and fill in default negotiate response message. |
50 | * | |
51 | * The max_fw_version specifies the maximum framework version that | |
52 | * we can support and max _srv_version specifies the maximum service | |
53 | * version we can support. A special value MAX_SRV_VER can be | |
54 | * specified to indicate that we can handle the maximum version | |
55 | * exposed by the host. | |
c88c4e4c HJ |
56 | * |
57 | * Mainly used by Hyper-V drivers. | |
58 | */ | |
da0e9631 | 59 | void vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab S |
60 | struct icmsg_negotiate *negop, u8 *buf, |
61 | int max_fw_version, int max_srv_version) | |
c88c4e4c | 62 | { |
c836d0ab S |
63 | int icframe_vercnt; |
64 | int icmsg_vercnt; | |
65 | int i; | |
66 | ||
a3605300 | 67 | icmsghdrp->icmsgsize = 0x10; |
c88c4e4c | 68 | |
a3605300 S |
69 | negop = (struct icmsg_negotiate *)&buf[ |
70 | sizeof(struct vmbuspipe_hdr) + | |
71 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 72 | |
c836d0ab S |
73 | icframe_vercnt = negop->icframe_vercnt; |
74 | icmsg_vercnt = negop->icmsg_vercnt; | |
75 | ||
76 | /* | |
77 | * Select the framework version number we will | |
78 | * support. | |
79 | */ | |
80 | ||
81 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
82 | if (negop->icversion_data[i].major <= max_fw_version) | |
83 | icframe_vercnt = negop->icversion_data[i].major; | |
84 | } | |
85 | ||
86 | for (i = negop->icframe_vercnt; | |
87 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
88 | if (negop->icversion_data[i].major <= max_srv_version) | |
89 | icmsg_vercnt = negop->icversion_data[i].major; | |
c88c4e4c | 90 | } |
a3605300 | 91 | |
c836d0ab S |
92 | /* |
93 | * Respond with the maximum framework and service | |
94 | * version numbers we can support. | |
95 | */ | |
a3605300 S |
96 | negop->icframe_vercnt = 1; |
97 | negop->icmsg_vercnt = 1; | |
c836d0ab S |
98 | negop->icversion_data[0].major = icframe_vercnt; |
99 | negop->icversion_data[0].minor = 0; | |
100 | negop->icversion_data[1].major = icmsg_vercnt; | |
101 | negop->icversion_data[1].minor = 0; | |
c88c4e4c | 102 | } |
a3605300 | 103 | |
da0e9631 | 104 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 105 | |
3e189519 | 106 | /* |
e98cb276 | 107 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 108 | */ |
50fe56d2 | 109 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 110 | { |
aded7165 | 111 | struct vmbus_channel *channel; |
3e7ee490 | 112 | |
aded7165 | 113 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 114 | if (!channel) |
3e7ee490 | 115 | return NULL; |
3e7ee490 | 116 | |
54411c42 | 117 | spin_lock_init(&channel->inbound_lock); |
3e7ee490 | 118 | |
c50f7fb2 HZ |
119 | channel->controlwq = create_workqueue("hv_vmbus_ctl"); |
120 | if (!channel->controlwq) { | |
8c69f52a | 121 | kfree(channel); |
3e7ee490 HJ |
122 | return NULL; |
123 | } | |
124 | ||
125 | return channel; | |
126 | } | |
127 | ||
3e189519 | 128 | /* |
e98cb276 | 129 | * release_hannel - Release the vmbus channel object itself |
bd60c33e | 130 | */ |
4b2f9abe | 131 | static void release_channel(struct work_struct *work) |
3e7ee490 | 132 | { |
4b2f9abe TT |
133 | struct vmbus_channel *channel = container_of(work, |
134 | struct vmbus_channel, | |
135 | work); | |
3e7ee490 | 136 | |
c50f7fb2 | 137 | destroy_workqueue(channel->controlwq); |
3e7ee490 | 138 | |
8c69f52a | 139 | kfree(channel); |
3e7ee490 HJ |
140 | } |
141 | ||
3e189519 | 142 | /* |
e98cb276 | 143 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 144 | */ |
9f3e28e3 | 145 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 146 | { |
3e7ee490 | 147 | |
bd60c33e GKH |
148 | /* |
149 | * We have to release the channel's workqueue/thread in the vmbus's | |
150 | * workqueue/thread context | |
151 | * ie we can't destroy ourselves. | |
152 | */ | |
4b2f9abe | 153 | INIT_WORK(&channel->work, release_channel); |
da9fcb72 | 154 | queue_work(vmbus_connection.work_queue, &channel->work); |
3e7ee490 HJ |
155 | } |
156 | ||
8b5d6d3b | 157 | |
8b5d6d3b | 158 | |
4b2f9abe TT |
159 | /* |
160 | * vmbus_process_rescind_offer - | |
161 | * Rescind the offer by initiating a device removal | |
162 | */ | |
163 | static void vmbus_process_rescind_offer(struct work_struct *work) | |
164 | { | |
165 | struct vmbus_channel *channel = container_of(work, | |
166 | struct vmbus_channel, | |
167 | work); | |
168 | ||
696453ba | 169 | vmbus_device_unregister(channel->device_obj); |
4b2f9abe | 170 | } |
8b5d6d3b | 171 | |
93e5bd06 S |
172 | void vmbus_free_channels(void) |
173 | { | |
174 | struct vmbus_channel *channel; | |
175 | ||
176 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
177 | vmbus_device_unregister(channel->device_obj); | |
178 | kfree(channel->device_obj); | |
179 | free_channel(channel); | |
180 | } | |
181 | } | |
182 | ||
3e189519 | 183 | /* |
e98cb276 | 184 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 185 | * associated with this offer |
bd60c33e | 186 | */ |
4b2f9abe | 187 | static void vmbus_process_offer(struct work_struct *work) |
3e7ee490 | 188 | { |
4b2f9abe TT |
189 | struct vmbus_channel *newchannel = container_of(work, |
190 | struct vmbus_channel, | |
191 | work); | |
aded7165 | 192 | struct vmbus_channel *channel; |
188963ec | 193 | bool fnew = true; |
bd60c33e | 194 | int ret; |
0f5e44ca | 195 | unsigned long flags; |
3e7ee490 | 196 | |
4b2f9abe TT |
197 | /* The next possible work is rescind handling */ |
198 | INIT_WORK(&newchannel->work, vmbus_process_rescind_offer); | |
199 | ||
454f18a9 | 200 | /* Make sure this is a new offer */ |
15b2f647 | 201 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 202 | |
da9fcb72 | 203 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
204 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
205 | newchannel->offermsg.offer.if_type) && | |
206 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
207 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 208 | fnew = false; |
3e7ee490 HJ |
209 | break; |
210 | } | |
211 | } | |
212 | ||
188963ec | 213 | if (fnew) |
c50f7fb2 | 214 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 215 | &vmbus_connection.chn_list); |
bd60c33e | 216 | |
15b2f647 | 217 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 218 | |
188963ec | 219 | if (!fnew) { |
e98cb276 | 220 | free_channel(newchannel); |
3e7ee490 HJ |
221 | return; |
222 | } | |
223 | ||
bd60c33e GKH |
224 | /* |
225 | * Start the process of binding this offer to the driver | |
226 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 227 | * vmbus_child_dev_add() |
bd60c33e | 228 | */ |
f2c73011 | 229 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
230 | &newchannel->offermsg.offer.if_type, |
231 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 232 | newchannel); |
3e7ee490 | 233 | |
454f18a9 BP |
234 | /* |
235 | * Add the new device to the bus. This will kick off device-driver | |
236 | * binding which eventually invokes the device driver's AddDevice() | |
237 | * method. | |
238 | */ | |
22794281 | 239 | ret = vmbus_device_register(newchannel->device_obj); |
bd60c33e | 240 | if (ret != 0) { |
0a46618d | 241 | pr_err("unable to add child device object (relid %d)\n", |
c50f7fb2 | 242 | newchannel->offermsg.child_relid); |
3e7ee490 | 243 | |
15b2f647 | 244 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
c50f7fb2 | 245 | list_del(&newchannel->listentry); |
15b2f647 | 246 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
8b8ee675 | 247 | kfree(newchannel->device_obj); |
3e7ee490 | 248 | |
e98cb276 | 249 | free_channel(newchannel); |
bd60c33e | 250 | } else { |
454f18a9 BP |
251 | /* |
252 | * This state is used to indicate a successful open | |
253 | * so that when we do close the channel normally, we | |
254 | * can cleanup properly | |
255 | */ | |
c50f7fb2 | 256 | newchannel->state = CHANNEL_OPEN_STATE; |
3e7ee490 | 257 | } |
3e7ee490 HJ |
258 | } |
259 | ||
3e189519 | 260 | /* |
e98cb276 | 261 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 262 | * |
bd60c33e | 263 | */ |
e98cb276 | 264 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 265 | { |
bd60c33e | 266 | struct vmbus_channel_offer_channel *offer; |
188963ec | 267 | struct vmbus_channel *newchannel; |
358d2ee2 S |
268 | uuid_le *guidtype; |
269 | uuid_le *guidinstance; | |
3e7ee490 | 270 | |
bd60c33e | 271 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 272 | |
767dff68 HZ |
273 | guidtype = &offer->offer.if_type; |
274 | guidinstance = &offer->offer.if_instance; | |
3e7ee490 | 275 | |
454f18a9 | 276 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 277 | newchannel = alloc_channel(); |
188963ec | 278 | if (!newchannel) { |
0a46618d | 279 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
280 | return; |
281 | } | |
282 | ||
c50f7fb2 | 283 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 284 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
285 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
286 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 287 | |
4b2f9abe TT |
288 | INIT_WORK(&newchannel->work, vmbus_process_offer); |
289 | queue_work(newchannel->controlwq, &newchannel->work); | |
3e7ee490 HJ |
290 | } |
291 | ||
3e189519 | 292 | /* |
e98cb276 | 293 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
294 | * |
295 | * We queue a work item to process this offer synchronously | |
296 | */ | |
e98cb276 | 297 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 298 | { |
bd60c33e | 299 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 300 | struct vmbus_channel *channel; |
3e7ee490 | 301 | |
bd60c33e | 302 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
c6977677 | 303 | channel = relid2channel(rescind->child_relid); |
98e08702 HJ |
304 | |
305 | if (channel == NULL) | |
306 | /* Just return here, no channel found */ | |
3e7ee490 | 307 | return; |
3e7ee490 | 308 | |
4b2f9abe TT |
309 | /* work is initialized for vmbus_process_rescind_offer() from |
310 | * vmbus_process_offer() where the channel got created */ | |
311 | queue_work(channel->controlwq, &channel->work); | |
3e7ee490 HJ |
312 | } |
313 | ||
3e189519 | 314 | /* |
e98cb276 HZ |
315 | * vmbus_onoffers_delivered - |
316 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
317 | * |
318 | * Nothing to do here. | |
319 | */ | |
e98cb276 | 320 | static void vmbus_onoffers_delivered( |
bd60c33e | 321 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 322 | { |
3e7ee490 HJ |
323 | } |
324 | ||
3e189519 | 325 | /* |
e98cb276 | 326 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
327 | * |
328 | * This is invoked when we received a response to our channel open request. | |
329 | * Find the matching request, copy the response and signal the requesting | |
330 | * thread. | |
331 | */ | |
e98cb276 | 332 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 333 | { |
bd60c33e | 334 | struct vmbus_channel_open_result *result; |
188963ec HZ |
335 | struct vmbus_channel_msginfo *msginfo; |
336 | struct vmbus_channel_message_header *requestheader; | |
337 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 338 | unsigned long flags; |
3e7ee490 | 339 | |
bd60c33e | 340 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 341 | |
bd60c33e GKH |
342 | /* |
343 | * Find the open msg, copy the result and signal/unblock the wait event | |
344 | */ | |
15b2f647 | 345 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 346 | |
ebb61e5f HJ |
347 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
348 | msglistentry) { | |
188963ec | 349 | requestheader = |
c50f7fb2 | 350 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 351 | |
c50f7fb2 | 352 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 353 | openmsg = |
c50f7fb2 HZ |
354 | (struct vmbus_channel_open_channel *)msginfo->msg; |
355 | if (openmsg->child_relid == result->child_relid && | |
356 | openmsg->openid == result->openid) { | |
357 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 358 | result, |
9568a193 S |
359 | sizeof( |
360 | struct vmbus_channel_open_result)); | |
361 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
362 | break; |
363 | } | |
364 | } | |
365 | } | |
15b2f647 | 366 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
367 | } |
368 | ||
3e189519 | 369 | /* |
e98cb276 | 370 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
371 | * |
372 | * This is invoked when we received a response to our gpadl create request. | |
373 | * Find the matching request, copy the response and signal the requesting | |
374 | * thread. | |
375 | */ | |
e98cb276 | 376 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 377 | { |
188963ec | 378 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
379 | struct vmbus_channel_msginfo *msginfo; |
380 | struct vmbus_channel_message_header *requestheader; | |
381 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 382 | unsigned long flags; |
3e7ee490 | 383 | |
188963ec | 384 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 385 | |
bd60c33e GKH |
386 | /* |
387 | * Find the establish msg, copy the result and signal/unblock the wait | |
388 | * event | |
389 | */ | |
15b2f647 | 390 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 391 | |
ebb61e5f HJ |
392 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
393 | msglistentry) { | |
188963ec | 394 | requestheader = |
c50f7fb2 | 395 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 396 | |
c50f7fb2 | 397 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
398 | gpadlheader = |
399 | (struct vmbus_channel_gpadl_header *)requestheader; | |
400 | ||
c50f7fb2 HZ |
401 | if ((gpadlcreated->child_relid == |
402 | gpadlheader->child_relid) && | |
403 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
404 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 405 | gpadlcreated, |
9568a193 S |
406 | sizeof( |
407 | struct vmbus_channel_gpadl_created)); | |
408 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
409 | break; |
410 | } | |
411 | } | |
412 | } | |
15b2f647 | 413 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
414 | } |
415 | ||
3e189519 | 416 | /* |
e98cb276 | 417 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
418 | * |
419 | * This is invoked when we received a response to our gpadl teardown request. | |
420 | * Find the matching request, copy the response and signal the requesting | |
421 | * thread. | |
422 | */ | |
e98cb276 | 423 | static void vmbus_ongpadl_torndown( |
bd60c33e | 424 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 425 | { |
188963ec | 426 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
427 | struct vmbus_channel_msginfo *msginfo; |
428 | struct vmbus_channel_message_header *requestheader; | |
429 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 430 | unsigned long flags; |
3e7ee490 | 431 | |
188963ec | 432 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
433 | |
434 | /* | |
435 | * Find the open msg, copy the result and signal/unblock the wait event | |
436 | */ | |
15b2f647 | 437 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 438 | |
ebb61e5f HJ |
439 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
440 | msglistentry) { | |
188963ec | 441 | requestheader = |
c50f7fb2 | 442 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 443 | |
c50f7fb2 | 444 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
445 | gpadl_teardown = |
446 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 447 | |
c50f7fb2 HZ |
448 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
449 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 450 | gpadl_torndown, |
9568a193 S |
451 | sizeof( |
452 | struct vmbus_channel_gpadl_torndown)); | |
453 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
454 | break; |
455 | } | |
456 | } | |
457 | } | |
15b2f647 | 458 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
459 | } |
460 | ||
3e189519 | 461 | /* |
e98cb276 | 462 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
463 | * |
464 | * This is invoked when we received a response to our initiate contact request. | |
465 | * Find the matching request, copy the response and signal the requesting | |
466 | * thread. | |
467 | */ | |
e98cb276 | 468 | static void vmbus_onversion_response( |
bd60c33e | 469 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 470 | { |
188963ec HZ |
471 | struct vmbus_channel_msginfo *msginfo; |
472 | struct vmbus_channel_message_header *requestheader; | |
82250213 | 473 | struct vmbus_channel_initiate_contact *initiate; |
188963ec | 474 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 475 | unsigned long flags; |
3e7ee490 | 476 | |
188963ec | 477 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 478 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 479 | |
ebb61e5f HJ |
480 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
481 | msglistentry) { | |
188963ec | 482 | requestheader = |
c50f7fb2 | 483 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 484 | |
c50f7fb2 HZ |
485 | if (requestheader->msgtype == |
486 | CHANNELMSG_INITIATE_CONTACT) { | |
188963ec HZ |
487 | initiate = |
488 | (struct vmbus_channel_initiate_contact *)requestheader; | |
c50f7fb2 | 489 | memcpy(&msginfo->response.version_response, |
188963ec | 490 | version_response, |
bd60c33e | 491 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 492 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
493 | } |
494 | } | |
15b2f647 | 495 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
496 | } |
497 | ||
c8212f04 GKH |
498 | /* Channel message dispatch table */ |
499 | static struct vmbus_channel_message_table_entry | |
b7c6b02f | 500 | channel_message_table[CHANNELMSG_COUNT] = { |
c50f7fb2 HZ |
501 | {CHANNELMSG_INVALID, NULL}, |
502 | {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer}, | |
503 | {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind}, | |
504 | {CHANNELMSG_REQUESTOFFERS, NULL}, | |
505 | {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered}, | |
506 | {CHANNELMSG_OPENCHANNEL, NULL}, | |
507 | {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result}, | |
508 | {CHANNELMSG_CLOSECHANNEL, NULL}, | |
509 | {CHANNELMSG_GPADL_HEADER, NULL}, | |
510 | {CHANNELMSG_GPADL_BODY, NULL}, | |
511 | {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created}, | |
512 | {CHANNELMSG_GPADL_TEARDOWN, NULL}, | |
513 | {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown}, | |
514 | {CHANNELMSG_RELID_RELEASED, NULL}, | |
515 | {CHANNELMSG_INITIATE_CONTACT, NULL}, | |
516 | {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response}, | |
517 | {CHANNELMSG_UNLOAD, NULL}, | |
c8212f04 GKH |
518 | }; |
519 | ||
3e189519 | 520 | /* |
e98cb276 | 521 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
522 | * |
523 | * This is invoked in the vmbus worker thread context. | |
524 | */ | |
e98cb276 | 525 | void vmbus_onmessage(void *context) |
3e7ee490 | 526 | { |
188963ec | 527 | struct hv_message *msg = context; |
82250213 | 528 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
529 | int size; |
530 | ||
f6feebe0 HZ |
531 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
532 | size = msg->header.payload_size; | |
3e7ee490 | 533 | |
c50f7fb2 | 534 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 535 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 536 | hdr->msgtype, size); |
04f50c4d | 537 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 538 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
539 | return; |
540 | } | |
541 | ||
b7c6b02f S |
542 | if (channel_message_table[hdr->msgtype].message_handler) |
543 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 544 | else |
0a46618d | 545 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
546 | } |
547 | ||
3e189519 | 548 | /* |
e98cb276 | 549 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 550 | */ |
e98cb276 | 551 | int vmbus_request_offers(void) |
3e7ee490 | 552 | { |
82250213 | 553 | struct vmbus_channel_message_header *msg; |
188963ec | 554 | struct vmbus_channel_msginfo *msginfo; |
9568a193 | 555 | int ret, t; |
3e7ee490 | 556 | |
188963ec | 557 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
558 | sizeof(struct vmbus_channel_message_header), |
559 | GFP_KERNEL); | |
188963ec | 560 | if (!msginfo) |
75910f23 | 561 | return -ENOMEM; |
3e7ee490 | 562 | |
9568a193 | 563 | init_completion(&msginfo->waitevent); |
75910f23 | 564 | |
c50f7fb2 | 565 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 566 | |
c50f7fb2 | 567 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 568 | |
3e7ee490 | 569 | |
c6977677 | 570 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
571 | sizeof(struct vmbus_channel_message_header)); |
572 | if (ret != 0) { | |
0a46618d | 573 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 574 | |
0c3b7b2f S |
575 | goto cleanup; |
576 | } | |
3e7ee490 | 577 | |
2dfde964 | 578 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 579 | if (t == 0) { |
0c3b7b2f S |
580 | ret = -ETIMEDOUT; |
581 | goto cleanup; | |
3e7ee490 | 582 | } |
3e7ee490 | 583 | |
3e7ee490 HJ |
584 | |
585 | ||
0c3b7b2f | 586 | cleanup: |
dd9b15dc | 587 | kfree(msginfo); |
3e7ee490 | 588 | |
3e7ee490 HJ |
589 | return ret; |
590 | } | |
591 | ||
454f18a9 | 592 | /* eof */ |