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>
23 #include <linux/slab.h>
24 #include <linux/list.h>
25 #include <linux/module.h>
26 #include <linux/completion.h>
29 #include "vmbus_private.h"
32 struct vmbus_channel_message_table_entry {
33 enum vmbus_channel_message_type messageType;
34 void (*messageHandler)(struct vmbus_channel_message_header *msg);
37 #define MAX_MSG_TYPES 4
38 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 8
40 static const struct hv_guid
41 gSupportedDeviceClasses[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
42 /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
46 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
47 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
51 /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
55 0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
56 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
60 /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
64 0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
65 0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
69 /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
73 0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
74 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
77 /* 0E0B6031-5213-4934-818B-38D90CED39DB */
81 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
82 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
85 /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
89 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
90 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
93 /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
97 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
98 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
101 /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
105 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
106 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
114 * prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
115 * @icmsghdrp: Pointer to msg header structure
116 * @icmsg_negotiate: Pointer to negotiate message structure
117 * @buf: Raw buffer channel data
119 * @icmsghdrp is of type &struct icmsg_hdr.
120 * @negop is of type &struct icmsg_negotiate.
121 * Set up and fill in default negotiate response message. This response can
122 * come from both the vmbus driver and the hv_utils driver. The current api
123 * will respond properly to both Windows 2008 and Windows 2008-R2 operating
126 * Mainly used by Hyper-V drivers.
128 void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
129 struct icmsg_negotiate *negop,
132 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
133 icmsghdrp->icmsgsize = 0x10;
135 negop = (struct icmsg_negotiate *)&buf[
136 sizeof(struct vmbuspipe_hdr) +
137 sizeof(struct icmsg_hdr)];
139 if (negop->icframe_vercnt == 2 &&
140 negop->icversion_data[1].major == 3) {
141 negop->icversion_data[0].major = 3;
142 negop->icversion_data[0].minor = 0;
143 negop->icversion_data[1].major = 3;
144 negop->icversion_data[1].minor = 0;
146 negop->icversion_data[0].major = 1;
147 negop->icversion_data[0].minor = 0;
148 negop->icversion_data[1].major = 1;
149 negop->icversion_data[1].minor = 0;
152 negop->icframe_vercnt = 1;
153 negop->icmsg_vercnt = 1;
156 EXPORT_SYMBOL(prep_negotiate_resp);
159 * chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
161 * @context: Pointer to argument structure.
163 * Set up the default handler for non device driver specific requests
164 * from Hyper-V. This stub responds to the default negotiate messages
165 * that come in for every non IDE/SCSI/Network request.
166 * This behavior is normally overwritten in the hv_utils driver. That
167 * driver handles requests like gracefull shutdown, heartbeats etc.
169 * Mainly used by Hyper-V drivers.
171 void chn_cb_negotiate(void *context)
173 struct vmbus_channel *channel = context;
178 struct icmsg_hdr *icmsghdrp;
179 struct icmsg_negotiate *negop = NULL;
182 buf = kmalloc(buflen, GFP_ATOMIC);
184 vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
187 icmsghdrp = (struct icmsg_hdr *)&buf[
188 sizeof(struct vmbuspipe_hdr)];
190 prep_negotiate_resp(icmsghdrp, negop, buf);
192 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
193 | ICMSGHDRFLAG_RESPONSE;
195 vmbus_sendpacket(channel, buf,
197 VM_PKT_DATA_INBAND, 0);
202 EXPORT_SYMBOL(chn_cb_negotiate);
205 * Function table used for message responses for non IDE/SCSI/Network type
206 * messages. (Such as KVP/Shutdown etc)
208 struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
209 /* 0E0B6031-5213-4934-818B-38D90CED39DB */
212 .msg_type = HV_SHUTDOWN_MSG,
214 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
215 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
217 .callback = chn_cb_negotiate,
218 .log_msg = "Shutdown channel functionality initialized"
221 /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
224 .msg_type = HV_TIMESYNC_MSG,
226 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
227 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
229 .callback = chn_cb_negotiate,
230 .log_msg = "Timesync channel functionality initialized"
232 /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
235 .msg_type = HV_HEARTBEAT_MSG,
237 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
238 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
240 .callback = chn_cb_negotiate,
241 .log_msg = "Heartbeat channel functionality initialized"
243 /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
247 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
248 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
250 .callback = chn_cb_negotiate,
251 .log_msg = "KVP channel functionality initialized"
254 EXPORT_SYMBOL(hv_cb_utils);
257 * alloc_channel - Allocate and initialize a vmbus channel object
259 static struct vmbus_channel *alloc_channel(void)
261 struct vmbus_channel *channel;
263 channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
267 spin_lock_init(&channel->inbound_lock);
269 init_timer(&channel->poll_timer);
270 channel->poll_timer.data = (unsigned long)channel;
271 channel->poll_timer.function = vmbus_ontimer;
273 channel->controlwq = create_workqueue("hv_vmbus_ctl");
274 if (!channel->controlwq) {
283 * release_hannel - Release the vmbus channel object itself
285 static void release_channel(struct work_struct *work)
287 struct vmbus_channel *channel = container_of(work,
288 struct vmbus_channel,
291 DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
292 destroy_workqueue(channel->controlwq);
293 DPRINT_DBG(VMBUS, "channel released (%p)", channel);
299 * free_channel - Release the resources used by the vmbus channel object
301 void free_channel(struct vmbus_channel *channel)
303 del_timer_sync(&channel->poll_timer);
306 * We have to release the channel's workqueue/thread in the vmbus's
307 * workqueue/thread context
308 * ie we can't destroy ourselves.
310 INIT_WORK(&channel->work, release_channel);
311 queue_work(vmbus_connection.WorkQueue, &channel->work);
315 DECLARE_COMPLETION(hv_channel_ready);
318 * Count initialized channels, and ensure all channels are ready when hv_vmbus
319 * module loading completes.
321 static void count_hv_channel(void)
326 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
327 if (++counter == MAX_MSG_TYPES)
328 complete(&hv_channel_ready);
329 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
333 * vmbus_process_rescind_offer -
334 * Rescind the offer by initiating a device removal
336 static void vmbus_process_rescind_offer(struct work_struct *work)
338 struct vmbus_channel *channel = container_of(work,
339 struct vmbus_channel,
342 vmbus_child_device_unregister(channel->device_obj);
346 * vmbus_process_offer - Process the offer by creating a channel/device
347 * associated with this offer
349 static void vmbus_process_offer(struct work_struct *work)
351 struct vmbus_channel *newchannel = container_of(work,
352 struct vmbus_channel,
354 struct vmbus_channel *channel;
360 /* The next possible work is rescind handling */
361 INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
363 /* Make sure this is a new offer */
364 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
366 list_for_each_entry(channel, &vmbus_connection.ChannelList, listentry) {
367 if (!memcmp(&channel->offermsg.offer.if_type,
368 &newchannel->offermsg.offer.if_type,
369 sizeof(struct hv_guid)) &&
370 !memcmp(&channel->offermsg.offer.if_instance,
371 &newchannel->offermsg.offer.if_instance,
372 sizeof(struct hv_guid))) {
379 list_add_tail(&newchannel->listentry,
380 &vmbus_connection.ChannelList);
382 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
385 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
386 newchannel->offermsg.child_relid);
387 free_channel(newchannel);
392 * Start the process of binding this offer to the driver
393 * We need to set the DeviceObject field before calling
394 * vmbus_child_dev_add()
396 newchannel->device_obj = vmbus_child_device_create(
397 &newchannel->offermsg.offer.if_type,
398 &newchannel->offermsg.offer.if_instance,
401 DPRINT_DBG(VMBUS, "child device object allocated - %p",
402 newchannel->device_obj);
405 * Add the new device to the bus. This will kick off device-driver
406 * binding which eventually invokes the device driver's AddDevice()
409 ret = vmbus_child_dev_add(newchannel->device_obj);
412 "unable to add child device object (relid %d)",
413 newchannel->offermsg.child_relid);
415 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
416 list_del(&newchannel->listentry);
417 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
419 free_channel(newchannel);
422 * This state is used to indicate a successful open
423 * so that when we do close the channel normally, we
424 * can cleanup properly
426 newchannel->state = CHANNEL_OPEN_STATE;
428 /* Open IC channels */
429 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
430 if (memcmp(&newchannel->offermsg.offer.if_type,
431 &hv_cb_utils[cnt].data,
432 sizeof(struct hv_guid)) == 0 &&
433 vmbus_open(newchannel, 2 * PAGE_SIZE,
434 2 * PAGE_SIZE, NULL, 0,
435 hv_cb_utils[cnt].callback,
437 hv_cb_utils[cnt].channel = newchannel;
438 DPRINT_INFO(VMBUS, "%s",
439 hv_cb_utils[cnt].log_msg);
447 * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
449 * We ignore all offers except network and storage offers. For each network and
450 * storage offers, we create a channel object and queue a work item to the
451 * channel object to process the offer synchronously
453 static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
455 struct vmbus_channel_offer_channel *offer;
456 struct vmbus_channel *newchannel;
457 struct hv_guid *guidtype;
458 struct hv_guid *guidinstance;
462 offer = (struct vmbus_channel_offer_channel *)hdr;
463 for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
464 if (memcmp(&offer->offer.if_type,
465 &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
472 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
473 "child relid %d", offer->child_relid);
477 guidtype = &offer->offer.if_type;
478 guidinstance = &offer->offer.if_instance;
480 DPRINT_INFO(VMBUS, "Channel offer notification - "
481 "child relid %d monitor id %d allocated %d, "
482 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
483 "%02x%02x%02x%02x%02x%02x%02x%02x} "
484 "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
485 "%02x%02x%02x%02x%02x%02x%02x%02x}",
486 offer->child_relid, offer->monitorid,
487 offer->monitor_allocated,
488 guidtype->data[3], guidtype->data[2],
489 guidtype->data[1], guidtype->data[0],
490 guidtype->data[5], guidtype->data[4],
491 guidtype->data[7], guidtype->data[6],
492 guidtype->data[8], guidtype->data[9],
493 guidtype->data[10], guidtype->data[11],
494 guidtype->data[12], guidtype->data[13],
495 guidtype->data[14], guidtype->data[15],
496 guidinstance->data[3], guidinstance->data[2],
497 guidinstance->data[1], guidinstance->data[0],
498 guidinstance->data[5], guidinstance->data[4],
499 guidinstance->data[7], guidinstance->data[6],
500 guidinstance->data[8], guidinstance->data[9],
501 guidinstance->data[10], guidinstance->data[11],
502 guidinstance->data[12], guidinstance->data[13],
503 guidinstance->data[14], guidinstance->data[15]);
505 /* Allocate the channel object and save this offer. */
506 newchannel = alloc_channel();
508 DPRINT_ERR(VMBUS, "unable to allocate channel object");
512 DPRINT_DBG(VMBUS, "channel object allocated - %p", newchannel);
514 memcpy(&newchannel->offermsg, offer,
515 sizeof(struct vmbus_channel_offer_channel));
516 newchannel->monitor_grp = (u8)offer->monitorid / 32;
517 newchannel->monitor_bit = (u8)offer->monitorid % 32;
519 /* TODO: Make sure the offer comes from our parent partition */
520 INIT_WORK(&newchannel->work, vmbus_process_offer);
521 queue_work(newchannel->controlwq, &newchannel->work);
525 * vmbus_onoffer_rescind - Rescind offer handler.
527 * We queue a work item to process this offer synchronously
529 static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
531 struct vmbus_channel_rescind_offer *rescind;
532 struct vmbus_channel *channel;
534 rescind = (struct vmbus_channel_rescind_offer *)hdr;
535 channel = relid2channel(rescind->child_relid);
536 if (channel == NULL) {
537 DPRINT_DBG(VMBUS, "channel not found for relId %d",
538 rescind->child_relid);
542 /* work is initialized for vmbus_process_rescind_offer() from
543 * vmbus_process_offer() where the channel got created */
544 queue_work(channel->controlwq, &channel->work);
548 * vmbus_onoffers_delivered -
549 * This is invoked when all offers have been delivered.
551 * Nothing to do here.
553 static void vmbus_onoffers_delivered(
554 struct vmbus_channel_message_header *hdr)
559 * vmbus_onopen_result - Open result handler.
561 * This is invoked when we received a response to our channel open request.
562 * Find the matching request, copy the response and signal the requesting
565 static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
567 struct vmbus_channel_open_result *result;
568 struct list_head *curr;
569 struct vmbus_channel_msginfo *msginfo;
570 struct vmbus_channel_message_header *requestheader;
571 struct vmbus_channel_open_channel *openmsg;
574 result = (struct vmbus_channel_open_result *)hdr;
575 DPRINT_DBG(VMBUS, "vmbus open result - %d", result->status);
578 * Find the open msg, copy the result and signal/unblock the wait event
580 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
582 list_for_each(curr, &vmbus_connection.ChannelMsgList) {
583 /* FIXME: this should probably use list_entry() instead */
584 msginfo = (struct vmbus_channel_msginfo *)curr;
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 osd_waitevent_set(msginfo->waitevent);
601 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
605 * vmbus_ongpadl_created - GPADL created handler.
607 * This is invoked when we received a response to our gpadl create request.
608 * Find the matching request, copy the response and signal the requesting
611 static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
613 struct vmbus_channel_gpadl_created *gpadlcreated;
614 struct list_head *curr;
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(curr, &vmbus_connection.ChannelMsgList) {
631 /* FIXME: this should probably use list_entry() instead */
632 msginfo = (struct vmbus_channel_msginfo *)curr;
634 (struct vmbus_channel_message_header *)msginfo->msg;
636 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
638 (struct vmbus_channel_gpadl_header *)requestheader;
640 if ((gpadlcreated->child_relid ==
641 gpadlheader->child_relid) &&
642 (gpadlcreated->gpadl == gpadlheader->gpadl)) {
643 memcpy(&msginfo->response.gpadl_created,
645 sizeof(struct vmbus_channel_gpadl_created));
646 osd_waitevent_set(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 list_head *curr;
666 struct vmbus_channel_msginfo *msginfo;
667 struct vmbus_channel_message_header *requestheader;
668 struct vmbus_channel_gpadl_teardown *gpadl_teardown;
671 gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
674 * Find the open msg, copy the result and signal/unblock the wait event
676 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
678 list_for_each(curr, &vmbus_connection.ChannelMsgList) {
679 /* FIXME: this should probably use list_entry() instead */
680 msginfo = (struct vmbus_channel_msginfo *)curr;
682 (struct vmbus_channel_message_header *)msginfo->msg;
684 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
686 (struct vmbus_channel_gpadl_teardown *)requestheader;
688 if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
689 memcpy(&msginfo->response.gpadl_torndown,
691 sizeof(struct vmbus_channel_gpadl_torndown));
692 osd_waitevent_set(msginfo->waitevent);
697 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
701 * vmbus_onversion_response - Version response handler
703 * This is invoked when we received a response to our initiate contact request.
704 * Find the matching request, copy the response and signal the requesting
707 static void vmbus_onversion_response(
708 struct vmbus_channel_message_header *hdr)
710 struct list_head *curr;
711 struct vmbus_channel_msginfo *msginfo;
712 struct vmbus_channel_message_header *requestheader;
713 struct vmbus_channel_initiate_contact *initiate;
714 struct vmbus_channel_version_response *version_response;
717 version_response = (struct vmbus_channel_version_response *)hdr;
718 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
720 list_for_each(curr, &vmbus_connection.ChannelMsgList) {
721 /* FIXME: this should probably use list_entry() instead */
722 msginfo = (struct vmbus_channel_msginfo *)curr;
724 (struct vmbus_channel_message_header *)msginfo->msg;
726 if (requestheader->msgtype ==
727 CHANNELMSG_INITIATE_CONTACT) {
729 (struct vmbus_channel_initiate_contact *)requestheader;
730 memcpy(&msginfo->response.version_response,
732 sizeof(struct vmbus_channel_version_response));
733 osd_waitevent_set(msginfo->waitevent);
736 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
739 /* Channel message dispatch table */
740 static struct vmbus_channel_message_table_entry
741 gChannelMessageTable[CHANNELMSG_COUNT] = {
742 {CHANNELMSG_INVALID, NULL},
743 {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
744 {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
745 {CHANNELMSG_REQUESTOFFERS, NULL},
746 {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
747 {CHANNELMSG_OPENCHANNEL, NULL},
748 {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
749 {CHANNELMSG_CLOSECHANNEL, NULL},
750 {CHANNELMSG_GPADL_HEADER, NULL},
751 {CHANNELMSG_GPADL_BODY, NULL},
752 {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
753 {CHANNELMSG_GPADL_TEARDOWN, NULL},
754 {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
755 {CHANNELMSG_RELID_RELEASED, NULL},
756 {CHANNELMSG_INITIATE_CONTACT, NULL},
757 {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
758 {CHANNELMSG_UNLOAD, NULL},
762 * vmbus_onmessage - Handler for channel protocol messages.
764 * This is invoked in the vmbus worker thread context.
766 void vmbus_onmessage(void *context)
768 struct hv_message *msg = context;
769 struct vmbus_channel_message_header *hdr;
772 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
773 size = msg->header.payload_size;
775 DPRINT_DBG(VMBUS, "message type %d size %d", hdr->msgtype, size);
777 if (hdr->msgtype >= CHANNELMSG_COUNT) {
779 "Received invalid channel message type %d size %d",
781 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
782 (unsigned char *)msg->u.payload, size);
786 if (gChannelMessageTable[hdr->msgtype].messageHandler)
787 gChannelMessageTable[hdr->msgtype].messageHandler(hdr);
789 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
794 * vmbus_request_offers - Send a request to get all our pending offers.
796 int vmbus_request_offers(void)
798 struct vmbus_channel_message_header *msg;
799 struct vmbus_channel_msginfo *msginfo;
802 msginfo = kmalloc(sizeof(*msginfo) +
803 sizeof(struct vmbus_channel_message_header),
808 msginfo->waitevent = osd_waitevent_create();
809 if (!msginfo->waitevent) {
814 msg = (struct vmbus_channel_message_header *)msginfo->msg;
816 msg->msgtype = CHANNELMSG_REQUESTOFFERS;
818 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
819 INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
820 &msgInfo->msgListEntry);
821 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
823 ret = vmbus_post_msg(msg,
824 sizeof(struct vmbus_channel_message_header));
826 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
828 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
829 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
830 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
834 /* osd_waitevent_wait(msgInfo->waitEvent); */
836 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
837 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
838 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
843 kfree(msginfo->waitevent);
851 * vmbus_release_unattached_channels - Release channels that are
852 * unattached/unconnected ie (no drivers associated)
854 void vmbus_release_unattached_channels(void)
856 struct vmbus_channel *channel, *pos;
857 struct vmbus_channel *start = NULL;
860 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
862 list_for_each_entry_safe(channel, pos, &vmbus_connection.ChannelList,
864 if (channel == start)
867 if (!channel->device_obj->drv) {
868 list_del(&channel->listentry);
870 "Releasing unattached device object %p",
871 channel->device_obj);
873 vmbus_child_device_unregister(channel->device_obj);
874 free_channel(channel);
881 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);