2 * Copyright (c) 2009, Microsoft Corporation.
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.
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
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.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
25 #include <linux/slab.h>
26 #include <linux/list.h>
27 #include <linux/module.h>
28 #include <linux/completion.h>
31 #include "vmbus_private.h"
34 struct vmbus_channel_message_table_entry
{
35 enum vmbus_channel_message_type messageType
;
36 void (*messageHandler
)(struct vmbus_channel_message_header
*msg
);
39 #define MAX_MSG_TYPES 4
40 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 8
42 static const struct hv_guid
43 gSupportedDeviceClasses
[MAX_NUM_DEVICE_CLASSES_SUPPORTED
] = {
44 /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
48 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
49 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
53 /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
57 0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
58 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
62 /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
66 0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
67 0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
71 /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
75 0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
76 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
79 /* 0E0B6031-5213-4934-818B-38D90CED39DB */
83 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
84 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
87 /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
91 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
92 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
95 /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
99 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
100 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
103 /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
107 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
108 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
116 * prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
117 * @icmsghdrp: Pointer to msg header structure
118 * @icmsg_negotiate: Pointer to negotiate message structure
119 * @buf: Raw buffer channel data
121 * @icmsghdrp is of type &struct icmsg_hdr.
122 * @negop is of type &struct icmsg_negotiate.
123 * Set up and fill in default negotiate response message. This response can
124 * come from both the vmbus driver and the hv_utils driver. The current api
125 * will respond properly to both Windows 2008 and Windows 2008-R2 operating
128 * Mainly used by Hyper-V drivers.
130 void prep_negotiate_resp(struct icmsg_hdr
*icmsghdrp
,
131 struct icmsg_negotiate
*negop
,
134 if (icmsghdrp
->icmsgtype
== ICMSGTYPE_NEGOTIATE
) {
135 icmsghdrp
->icmsgsize
= 0x10;
137 negop
= (struct icmsg_negotiate
*)&buf
[
138 sizeof(struct vmbuspipe_hdr
) +
139 sizeof(struct icmsg_hdr
)];
141 if (negop
->icframe_vercnt
== 2 &&
142 negop
->icversion_data
[1].major
== 3) {
143 negop
->icversion_data
[0].major
= 3;
144 negop
->icversion_data
[0].minor
= 0;
145 negop
->icversion_data
[1].major
= 3;
146 negop
->icversion_data
[1].minor
= 0;
148 negop
->icversion_data
[0].major
= 1;
149 negop
->icversion_data
[0].minor
= 0;
150 negop
->icversion_data
[1].major
= 1;
151 negop
->icversion_data
[1].minor
= 0;
154 negop
->icframe_vercnt
= 1;
155 negop
->icmsg_vercnt
= 1;
158 EXPORT_SYMBOL(prep_negotiate_resp
);
161 * chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
163 * @context: Pointer to argument structure.
165 * Set up the default handler for non device driver specific requests
166 * from Hyper-V. This stub responds to the default negotiate messages
167 * that come in for every non IDE/SCSI/Network request.
168 * This behavior is normally overwritten in the hv_utils driver. That
169 * driver handles requests like graceful shutdown, heartbeats etc.
171 * Mainly used by Hyper-V drivers.
173 void chn_cb_negotiate(void *context
)
175 struct vmbus_channel
*channel
= context
;
180 struct icmsg_hdr
*icmsghdrp
;
181 struct icmsg_negotiate
*negop
= NULL
;
184 buf
= kmalloc(buflen
, GFP_ATOMIC
);
186 vmbus_recvpacket(channel
, buf
, buflen
, &recvlen
, &requestid
);
189 icmsghdrp
= (struct icmsg_hdr
*)&buf
[
190 sizeof(struct vmbuspipe_hdr
)];
192 prep_negotiate_resp(icmsghdrp
, negop
, buf
);
194 icmsghdrp
->icflags
= ICMSGHDRFLAG_TRANSACTION
195 | ICMSGHDRFLAG_RESPONSE
;
197 vmbus_sendpacket(channel
, buf
,
199 VM_PKT_DATA_INBAND
, 0);
204 EXPORT_SYMBOL(chn_cb_negotiate
);
207 * Function table used for message responses for non IDE/SCSI/Network type
208 * messages. (Such as KVP/Shutdown etc)
210 struct hyperv_service_callback hv_cb_utils
[MAX_MSG_TYPES
] = {
211 /* 0E0B6031-5213-4934-818B-38D90CED39DB */
214 .msg_type
= HV_SHUTDOWN_MSG
,
216 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
217 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
219 .callback
= chn_cb_negotiate
,
220 .log_msg
= "Shutdown channel functionality initialized"
223 /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
226 .msg_type
= HV_TIMESYNC_MSG
,
228 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
229 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
231 .callback
= chn_cb_negotiate
,
232 .log_msg
= "Timesync channel functionality initialized"
234 /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
237 .msg_type
= HV_HEARTBEAT_MSG
,
239 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
240 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
242 .callback
= chn_cb_negotiate
,
243 .log_msg
= "Heartbeat channel functionality initialized"
245 /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
249 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
250 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
252 .callback
= chn_cb_negotiate
,
253 .log_msg
= "KVP channel functionality initialized"
256 EXPORT_SYMBOL(hv_cb_utils
);
259 * alloc_channel - Allocate and initialize a vmbus channel object
261 static struct vmbus_channel
*alloc_channel(void)
263 struct vmbus_channel
*channel
;
265 channel
= kzalloc(sizeof(*channel
), GFP_ATOMIC
);
269 spin_lock_init(&channel
->inbound_lock
);
271 init_timer(&channel
->poll_timer
);
272 channel
->poll_timer
.data
= (unsigned long)channel
;
273 channel
->poll_timer
.function
= vmbus_ontimer
;
275 channel
->controlwq
= create_workqueue("hv_vmbus_ctl");
276 if (!channel
->controlwq
) {
285 * release_hannel - Release the vmbus channel object itself
287 static void release_channel(struct work_struct
*work
)
289 struct vmbus_channel
*channel
= container_of(work
,
290 struct vmbus_channel
,
293 DPRINT_DBG(VMBUS
, "releasing channel (%p)", channel
);
294 destroy_workqueue(channel
->controlwq
);
295 DPRINT_DBG(VMBUS
, "channel released (%p)", channel
);
301 * free_channel - Release the resources used by the vmbus channel object
303 void free_channel(struct vmbus_channel
*channel
)
305 del_timer_sync(&channel
->poll_timer
);
308 * We have to release the channel's workqueue/thread in the vmbus's
309 * workqueue/thread context
310 * ie we can't destroy ourselves.
312 INIT_WORK(&channel
->work
, release_channel
);
313 queue_work(vmbus_connection
.work_queue
, &channel
->work
);
317 DECLARE_COMPLETION(hv_channel_ready
);
320 * Count initialized channels, and ensure all channels are ready when hv_vmbus
321 * module loading completes.
323 static void count_hv_channel(void)
328 spin_lock_irqsave(&vmbus_connection
.channel_lock
, flags
);
329 if (++counter
== MAX_MSG_TYPES
)
330 complete(&hv_channel_ready
);
331 spin_unlock_irqrestore(&vmbus_connection
.channel_lock
, flags
);
335 * vmbus_process_rescind_offer -
336 * Rescind the offer by initiating a device removal
338 static void vmbus_process_rescind_offer(struct work_struct
*work
)
340 struct vmbus_channel
*channel
= container_of(work
,
341 struct vmbus_channel
,
344 vmbus_child_device_unregister(channel
->device_obj
);
348 * vmbus_process_offer - Process the offer by creating a channel/device
349 * associated with this offer
351 static void vmbus_process_offer(struct work_struct
*work
)
353 struct vmbus_channel
*newchannel
= container_of(work
,
354 struct vmbus_channel
,
356 struct vmbus_channel
*channel
;
362 /* The next possible work is rescind handling */
363 INIT_WORK(&newchannel
->work
, vmbus_process_rescind_offer
);
365 /* Make sure this is a new offer */
366 spin_lock_irqsave(&vmbus_connection
.channel_lock
, flags
);
368 list_for_each_entry(channel
, &vmbus_connection
.chn_list
, listentry
) {
369 if (!memcmp(&channel
->offermsg
.offer
.if_type
,
370 &newchannel
->offermsg
.offer
.if_type
,
371 sizeof(struct hv_guid
)) &&
372 !memcmp(&channel
->offermsg
.offer
.if_instance
,
373 &newchannel
->offermsg
.offer
.if_instance
,
374 sizeof(struct hv_guid
))) {
381 list_add_tail(&newchannel
->listentry
,
382 &vmbus_connection
.chn_list
);
384 spin_unlock_irqrestore(&vmbus_connection
.channel_lock
, flags
);
387 DPRINT_DBG(VMBUS
, "Ignoring duplicate offer for relid (%d)",
388 newchannel
->offermsg
.child_relid
);
389 free_channel(newchannel
);
394 * Start the process of binding this offer to the driver
395 * We need to set the DeviceObject field before calling
396 * vmbus_child_dev_add()
398 newchannel
->device_obj
= vmbus_child_device_create(
399 &newchannel
->offermsg
.offer
.if_type
,
400 &newchannel
->offermsg
.offer
.if_instance
,
403 DPRINT_DBG(VMBUS
, "child device object allocated - %p",
404 newchannel
->device_obj
);
407 * Add the new device to the bus. This will kick off device-driver
408 * binding which eventually invokes the device driver's AddDevice()
411 ret
= vmbus_child_device_register(newchannel
->device_obj
);
414 "unable to add child device object (relid %d)",
415 newchannel
->offermsg
.child_relid
);
417 spin_lock_irqsave(&vmbus_connection
.channel_lock
, flags
);
418 list_del(&newchannel
->listentry
);
419 spin_unlock_irqrestore(&vmbus_connection
.channel_lock
, flags
);
421 free_channel(newchannel
);
424 * This state is used to indicate a successful open
425 * so that when we do close the channel normally, we
426 * can cleanup properly
428 newchannel
->state
= CHANNEL_OPEN_STATE
;
430 /* Open IC channels */
431 for (cnt
= 0; cnt
< MAX_MSG_TYPES
; cnt
++) {
432 if (memcmp(&newchannel
->offermsg
.offer
.if_type
,
433 &hv_cb_utils
[cnt
].data
,
434 sizeof(struct hv_guid
)) == 0 &&
435 vmbus_open(newchannel
, 2 * PAGE_SIZE
,
436 2 * PAGE_SIZE
, NULL
, 0,
437 hv_cb_utils
[cnt
].callback
,
439 hv_cb_utils
[cnt
].channel
= newchannel
;
440 DPRINT_INFO(VMBUS
, "%s",
441 hv_cb_utils
[cnt
].log_msg
);
449 * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
451 * We ignore all offers except network and storage offers. For each network and
452 * storage offers, we create a channel object and queue a work item to the
453 * channel object to process the offer synchronously
455 static void vmbus_onoffer(struct vmbus_channel_message_header
*hdr
)
457 struct vmbus_channel_offer_channel
*offer
;
458 struct vmbus_channel
*newchannel
;
459 struct hv_guid
*guidtype
;
460 struct hv_guid
*guidinstance
;
464 offer
= (struct vmbus_channel_offer_channel
*)hdr
;
465 for (i
= 0; i
< MAX_NUM_DEVICE_CLASSES_SUPPORTED
; i
++) {
466 if (memcmp(&offer
->offer
.if_type
,
467 &gSupportedDeviceClasses
[i
], sizeof(struct hv_guid
)) == 0) {
474 DPRINT_DBG(VMBUS
, "Ignoring channel offer notification for "
475 "child relid %d", offer
->child_relid
);
479 guidtype
= &offer
->offer
.if_type
;
480 guidinstance
= &offer
->offer
.if_instance
;
482 DPRINT_INFO(VMBUS
, "Channel offer notification - "
483 "child relid %d monitor id %d allocated %d, "
484 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
485 "%02x%02x%02x%02x%02x%02x%02x%02x} "
486 "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
487 "%02x%02x%02x%02x%02x%02x%02x%02x}",
488 offer
->child_relid
, offer
->monitorid
,
489 offer
->monitor_allocated
,
490 guidtype
->data
[3], guidtype
->data
[2],
491 guidtype
->data
[1], guidtype
->data
[0],
492 guidtype
->data
[5], guidtype
->data
[4],
493 guidtype
->data
[7], guidtype
->data
[6],
494 guidtype
->data
[8], guidtype
->data
[9],
495 guidtype
->data
[10], guidtype
->data
[11],
496 guidtype
->data
[12], guidtype
->data
[13],
497 guidtype
->data
[14], guidtype
->data
[15],
498 guidinstance
->data
[3], guidinstance
->data
[2],
499 guidinstance
->data
[1], guidinstance
->data
[0],
500 guidinstance
->data
[5], guidinstance
->data
[4],
501 guidinstance
->data
[7], guidinstance
->data
[6],
502 guidinstance
->data
[8], guidinstance
->data
[9],
503 guidinstance
->data
[10], guidinstance
->data
[11],
504 guidinstance
->data
[12], guidinstance
->data
[13],
505 guidinstance
->data
[14], guidinstance
->data
[15]);
507 /* Allocate the channel object and save this offer. */
508 newchannel
= alloc_channel();
510 DPRINT_ERR(VMBUS
, "unable to allocate channel object");
514 DPRINT_DBG(VMBUS
, "channel object allocated - %p", newchannel
);
516 memcpy(&newchannel
->offermsg
, offer
,
517 sizeof(struct vmbus_channel_offer_channel
));
518 newchannel
->monitor_grp
= (u8
)offer
->monitorid
/ 32;
519 newchannel
->monitor_bit
= (u8
)offer
->monitorid
% 32;
521 /* TODO: Make sure the offer comes from our parent partition */
522 INIT_WORK(&newchannel
->work
, vmbus_process_offer
);
523 queue_work(newchannel
->controlwq
, &newchannel
->work
);
527 * vmbus_onoffer_rescind - Rescind offer handler.
529 * We queue a work item to process this offer synchronously
531 static void vmbus_onoffer_rescind(struct vmbus_channel_message_header
*hdr
)
533 struct vmbus_channel_rescind_offer
*rescind
;
534 struct vmbus_channel
*channel
;
536 rescind
= (struct vmbus_channel_rescind_offer
*)hdr
;
537 channel
= relid2channel(rescind
->child_relid
);
538 if (channel
== NULL
) {
539 DPRINT_DBG(VMBUS
, "channel not found for relId %d",
540 rescind
->child_relid
);
544 /* work is initialized for vmbus_process_rescind_offer() from
545 * vmbus_process_offer() where the channel got created */
546 queue_work(channel
->controlwq
, &channel
->work
);
550 * vmbus_onoffers_delivered -
551 * This is invoked when all offers have been delivered.
553 * Nothing to do here.
555 static void vmbus_onoffers_delivered(
556 struct vmbus_channel_message_header
*hdr
)
561 * vmbus_onopen_result - Open result handler.
563 * This is invoked when we received a response to our channel open request.
564 * Find the matching request, copy the response and signal the requesting
567 static void vmbus_onopen_result(struct vmbus_channel_message_header
*hdr
)
569 struct vmbus_channel_open_result
*result
;
570 struct vmbus_channel_msginfo
*msginfo
;
571 struct vmbus_channel_message_header
*requestheader
;
572 struct vmbus_channel_open_channel
*openmsg
;
575 result
= (struct vmbus_channel_open_result
*)hdr
;
576 DPRINT_DBG(VMBUS
, "vmbus open result - %d", result
->status
);
579 * Find the open msg, copy the result and signal/unblock the wait event
581 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
583 list_for_each_entry(msginfo
, &vmbus_connection
.chn_msg_list
,
586 (struct vmbus_channel_message_header
*)msginfo
->msg
;
588 if (requestheader
->msgtype
== CHANNELMSG_OPENCHANNEL
) {
590 (struct vmbus_channel_open_channel
*)msginfo
->msg
;
591 if (openmsg
->child_relid
== result
->child_relid
&&
592 openmsg
->openid
== result
->openid
) {
593 memcpy(&msginfo
->response
.open_result
,
595 sizeof(struct vmbus_channel_open_result
));
596 msginfo
->wait_condition
= 1;
597 wake_up(&msginfo
->waitevent
);
602 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
606 * vmbus_ongpadl_created - GPADL created handler.
608 * This is invoked when we received a response to our gpadl create request.
609 * Find the matching request, copy the response and signal the requesting
612 static void vmbus_ongpadl_created(struct vmbus_channel_message_header
*hdr
)
614 struct vmbus_channel_gpadl_created
*gpadlcreated
;
615 struct vmbus_channel_msginfo
*msginfo
;
616 struct vmbus_channel_message_header
*requestheader
;
617 struct vmbus_channel_gpadl_header
*gpadlheader
;
620 gpadlcreated
= (struct vmbus_channel_gpadl_created
*)hdr
;
621 DPRINT_DBG(VMBUS
, "vmbus gpadl created result - %d",
622 gpadlcreated
->creation_status
);
625 * Find the establish msg, copy the result and signal/unblock the wait
628 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
630 list_for_each_entry(msginfo
, &vmbus_connection
.chn_msg_list
,
633 (struct vmbus_channel_message_header
*)msginfo
->msg
;
635 if (requestheader
->msgtype
== CHANNELMSG_GPADL_HEADER
) {
637 (struct vmbus_channel_gpadl_header
*)requestheader
;
639 if ((gpadlcreated
->child_relid
==
640 gpadlheader
->child_relid
) &&
641 (gpadlcreated
->gpadl
== gpadlheader
->gpadl
)) {
642 memcpy(&msginfo
->response
.gpadl_created
,
644 sizeof(struct vmbus_channel_gpadl_created
));
645 msginfo
->wait_condition
= 1;
646 wake_up(&msginfo
->waitevent
);
651 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
655 * vmbus_ongpadl_torndown - GPADL torndown handler.
657 * This is invoked when we received a response to our gpadl teardown request.
658 * Find the matching request, copy the response and signal the requesting
661 static void vmbus_ongpadl_torndown(
662 struct vmbus_channel_message_header
*hdr
)
664 struct vmbus_channel_gpadl_torndown
*gpadl_torndown
;
665 struct vmbus_channel_msginfo
*msginfo
;
666 struct vmbus_channel_message_header
*requestheader
;
667 struct vmbus_channel_gpadl_teardown
*gpadl_teardown
;
670 gpadl_torndown
= (struct vmbus_channel_gpadl_torndown
*)hdr
;
673 * Find the open msg, copy the result and signal/unblock the wait event
675 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
677 list_for_each_entry(msginfo
, &vmbus_connection
.chn_msg_list
,
680 (struct vmbus_channel_message_header
*)msginfo
->msg
;
682 if (requestheader
->msgtype
== CHANNELMSG_GPADL_TEARDOWN
) {
684 (struct vmbus_channel_gpadl_teardown
*)requestheader
;
686 if (gpadl_torndown
->gpadl
== gpadl_teardown
->gpadl
) {
687 memcpy(&msginfo
->response
.gpadl_torndown
,
689 sizeof(struct vmbus_channel_gpadl_torndown
));
690 msginfo
->wait_condition
= 1;
691 wake_up(&msginfo
->waitevent
);
696 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
700 * vmbus_onversion_response - Version response handler
702 * This is invoked when we received a response to our initiate contact request.
703 * Find the matching request, copy the response and signal the requesting
706 static void vmbus_onversion_response(
707 struct vmbus_channel_message_header
*hdr
)
709 struct vmbus_channel_msginfo
*msginfo
;
710 struct vmbus_channel_message_header
*requestheader
;
711 struct vmbus_channel_initiate_contact
*initiate
;
712 struct vmbus_channel_version_response
*version_response
;
715 version_response
= (struct vmbus_channel_version_response
*)hdr
;
716 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
718 list_for_each_entry(msginfo
, &vmbus_connection
.chn_msg_list
,
721 (struct vmbus_channel_message_header
*)msginfo
->msg
;
723 if (requestheader
->msgtype
==
724 CHANNELMSG_INITIATE_CONTACT
) {
726 (struct vmbus_channel_initiate_contact
*)requestheader
;
727 memcpy(&msginfo
->response
.version_response
,
729 sizeof(struct vmbus_channel_version_response
));
730 msginfo
->wait_condition
= 1;
731 wake_up(&msginfo
->waitevent
);
734 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
737 /* Channel message dispatch table */
738 static struct vmbus_channel_message_table_entry
739 gChannelMessageTable
[CHANNELMSG_COUNT
] = {
740 {CHANNELMSG_INVALID
, NULL
},
741 {CHANNELMSG_OFFERCHANNEL
, vmbus_onoffer
},
742 {CHANNELMSG_RESCIND_CHANNELOFFER
, vmbus_onoffer_rescind
},
743 {CHANNELMSG_REQUESTOFFERS
, NULL
},
744 {CHANNELMSG_ALLOFFERS_DELIVERED
, vmbus_onoffers_delivered
},
745 {CHANNELMSG_OPENCHANNEL
, NULL
},
746 {CHANNELMSG_OPENCHANNEL_RESULT
, vmbus_onopen_result
},
747 {CHANNELMSG_CLOSECHANNEL
, NULL
},
748 {CHANNELMSG_GPADL_HEADER
, NULL
},
749 {CHANNELMSG_GPADL_BODY
, NULL
},
750 {CHANNELMSG_GPADL_CREATED
, vmbus_ongpadl_created
},
751 {CHANNELMSG_GPADL_TEARDOWN
, NULL
},
752 {CHANNELMSG_GPADL_TORNDOWN
, vmbus_ongpadl_torndown
},
753 {CHANNELMSG_RELID_RELEASED
, NULL
},
754 {CHANNELMSG_INITIATE_CONTACT
, NULL
},
755 {CHANNELMSG_VERSION_RESPONSE
, vmbus_onversion_response
},
756 {CHANNELMSG_UNLOAD
, NULL
},
760 * vmbus_onmessage - Handler for channel protocol messages.
762 * This is invoked in the vmbus worker thread context.
764 void vmbus_onmessage(void *context
)
766 struct hv_message
*msg
= context
;
767 struct vmbus_channel_message_header
*hdr
;
770 hdr
= (struct vmbus_channel_message_header
*)msg
->u
.payload
;
771 size
= msg
->header
.payload_size
;
773 DPRINT_DBG(VMBUS
, "message type %d size %d", hdr
->msgtype
, size
);
775 if (hdr
->msgtype
>= CHANNELMSG_COUNT
) {
777 "Received invalid channel message type %d size %d",
779 print_hex_dump_bytes("", DUMP_PREFIX_NONE
,
780 (unsigned char *)msg
->u
.payload
, size
);
784 if (gChannelMessageTable
[hdr
->msgtype
].messageHandler
)
785 gChannelMessageTable
[hdr
->msgtype
].messageHandler(hdr
);
787 DPRINT_ERR(VMBUS
, "Unhandled channel message type %d",
792 * vmbus_request_offers - Send a request to get all our pending offers.
794 int vmbus_request_offers(void)
796 struct vmbus_channel_message_header
*msg
;
797 struct vmbus_channel_msginfo
*msginfo
;
800 msginfo
= kmalloc(sizeof(*msginfo
) +
801 sizeof(struct vmbus_channel_message_header
),
806 init_waitqueue_head(&msginfo
->waitevent
);
808 msg
= (struct vmbus_channel_message_header
*)msginfo
->msg
;
810 msg
->msgtype
= CHANNELMSG_REQUESTOFFERS
;
813 ret
= vmbus_post_msg(msg
,
814 sizeof(struct vmbus_channel_message_header
));
816 DPRINT_ERR(VMBUS
, "Unable to request offers - %d", ret
);
821 msginfo
->wait_condition
= 0;
822 wait_event_timeout(msginfo
->waitevent
, msginfo
->wait_condition
,
823 msecs_to_jiffies(1000));
824 if (msginfo
->wait_condition
== 0) {
838 * vmbus_release_unattached_channels - Release channels that are
839 * unattached/unconnected ie (no drivers associated)
841 void vmbus_release_unattached_channels(void)
843 struct vmbus_channel
*channel
, *pos
;
844 struct vmbus_channel
*start
= NULL
;
847 spin_lock_irqsave(&vmbus_connection
.channel_lock
, flags
);
849 list_for_each_entry_safe(channel
, pos
, &vmbus_connection
.chn_list
,
851 if (channel
== start
)
854 if (!channel
->device_obj
->drv
) {
855 list_del(&channel
->listentry
);
857 "Releasing unattached device object %p",
858 channel
->device_obj
);
860 vmbus_child_device_unregister(channel
->device_obj
);
861 free_channel(channel
);
868 spin_unlock_irqrestore(&vmbus_connection
.channel_lock
, flags
);