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 3
38 #define MAX_NUM_DEVICE_CLASSES_SUPPORTED 7
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
105 * prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
106 * @icmsghdrp: Pointer to msg header structure
107 * @icmsg_negotiate: Pointer to negotiate message structure
108 * @buf: Raw buffer channel data
110 * @icmsghdrp is of type &struct icmsg_hdr.
111 * @negop is of type &struct icmsg_negotiate.
112 * Set up and fill in default negotiate response message. This response can
113 * come from both the vmbus driver and the hv_utils driver. The current api
114 * will respond properly to both Windows 2008 and Windows 2008-R2 operating
117 * Mainly used by Hyper-V drivers.
119 void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
120 struct icmsg_negotiate *negop,
123 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
124 icmsghdrp->icmsgsize = 0x10;
126 negop = (struct icmsg_negotiate *)&buf[
127 sizeof(struct vmbuspipe_hdr) +
128 sizeof(struct icmsg_hdr)];
130 if (negop->icframe_vercnt == 2 &&
131 negop->icversion_data[1].major == 3) {
132 negop->icversion_data[0].major = 3;
133 negop->icversion_data[0].minor = 0;
134 negop->icversion_data[1].major = 3;
135 negop->icversion_data[1].minor = 0;
137 negop->icversion_data[0].major = 1;
138 negop->icversion_data[0].minor = 0;
139 negop->icversion_data[1].major = 1;
140 negop->icversion_data[1].minor = 0;
143 negop->icframe_vercnt = 1;
144 negop->icmsg_vercnt = 1;
147 EXPORT_SYMBOL(prep_negotiate_resp);
150 * chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
152 * @context: Pointer to argument structure.
154 * Set up the default handler for non device driver specific requests
155 * from Hyper-V. This stub responds to the default negotiate messages
156 * that come in for every non IDE/SCSI/Network request.
157 * This behavior is normally overwritten in the hv_utils driver. That
158 * driver handles requests like gracefull shutdown, heartbeats etc.
160 * Mainly used by Hyper-V drivers.
162 void chn_cb_negotiate(void *context)
164 struct vmbus_channel *channel = context;
169 struct icmsg_hdr *icmsghdrp;
170 struct icmsg_negotiate *negop = NULL;
173 buf = kmalloc(buflen, GFP_ATOMIC);
175 vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
178 icmsghdrp = (struct icmsg_hdr *)&buf[
179 sizeof(struct vmbuspipe_hdr)];
181 prep_negotiate_resp(icmsghdrp, negop, buf);
183 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
184 | ICMSGHDRFLAG_RESPONSE;
186 vmbus_sendpacket(channel, buf,
188 VmbusPacketTypeDataInBand, 0);
193 EXPORT_SYMBOL(chn_cb_negotiate);
196 * Function table used for message responses for non IDE/SCSI/Network type
197 * messages. (Such as KVP/Shutdown etc)
199 struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
200 /* 0E0B6031-5213-4934-818B-38D90CED39DB */
203 .msg_type = HV_SHUTDOWN_MSG,
205 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
206 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
208 .callback = chn_cb_negotiate,
209 .log_msg = "Shutdown channel functionality initialized"
212 /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
215 .msg_type = HV_TIMESYNC_MSG,
217 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
218 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
220 .callback = chn_cb_negotiate,
221 .log_msg = "Timesync channel functionality initialized"
223 /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
226 .msg_type = HV_HEARTBEAT_MSG,
228 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
229 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
231 .callback = chn_cb_negotiate,
232 .log_msg = "Heartbeat channel functionality initialized"
235 EXPORT_SYMBOL(hv_cb_utils);
238 * alloc_channel - Allocate and initialize a vmbus channel object
240 static struct vmbus_channel *alloc_channel(void)
242 struct vmbus_channel *channel;
244 channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
248 spin_lock_init(&channel->inbound_lock);
250 init_timer(&channel->poll_timer);
251 channel->poll_timer.data = (unsigned long)channel;
252 channel->poll_timer.function = vmbus_ontimer;
254 channel->controlwq = create_workqueue("hv_vmbus_ctl");
255 if (!channel->controlwq) {
264 * release_hannel - Release the vmbus channel object itself
266 static void release_channel(struct work_struct *work)
268 struct vmbus_channel *channel = container_of(work,
269 struct vmbus_channel,
272 DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
273 destroy_workqueue(channel->controlwq);
274 DPRINT_DBG(VMBUS, "channel released (%p)", channel);
280 * free_channel - Release the resources used by the vmbus channel object
282 void free_channel(struct vmbus_channel *channel)
284 del_timer_sync(&channel->poll_timer);
287 * We have to release the channel's workqueue/thread in the vmbus's
288 * workqueue/thread context
289 * ie we can't destroy ourselves.
291 INIT_WORK(&channel->work, release_channel);
292 queue_work(gVmbusConnection.WorkQueue, &channel->work);
296 DECLARE_COMPLETION(hv_channel_ready);
299 * Count initialized channels, and ensure all channels are ready when hv_vmbus
300 * module loading completes.
302 static void count_hv_channel(void)
307 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
308 if (++counter == MAX_MSG_TYPES)
309 complete(&hv_channel_ready);
310 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
314 * vmbus_process_rescind_offer -
315 * Rescind the offer by initiating a device removal
317 static void vmbus_process_rescind_offer(struct work_struct *work)
319 struct vmbus_channel *channel = container_of(work,
320 struct vmbus_channel,
323 vmbus_child_device_unregister(channel->device_obj);
327 * vmbus_process_offer - Process the offer by creating a channel/device
328 * associated with this offer
330 static void vmbus_process_offer(struct work_struct *work)
332 struct vmbus_channel *newchannel = container_of(work,
333 struct vmbus_channel,
335 struct vmbus_channel *channel;
341 /* The next possible work is rescind handling */
342 INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
344 /* Make sure this is a new offer */
345 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
347 list_for_each_entry(channel, &gVmbusConnection.ChannelList, listentry) {
348 if (!memcmp(&channel->offermsg.offer.InterfaceType,
349 &newchannel->offermsg.offer.InterfaceType,
350 sizeof(struct hv_guid)) &&
351 !memcmp(&channel->offermsg.offer.InterfaceInstance,
352 &newchannel->offermsg.offer.InterfaceInstance,
353 sizeof(struct hv_guid))) {
360 list_add_tail(&newchannel->listentry,
361 &gVmbusConnection.ChannelList);
363 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
366 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
367 newchannel->offermsg.child_relid);
368 free_channel(newchannel);
373 * Start the process of binding this offer to the driver
374 * We need to set the DeviceObject field before calling
375 * VmbusChildDeviceAdd()
377 newchannel->device_obj = vmbus_child_device_create(
378 &newchannel->offermsg.offer.InterfaceType,
379 &newchannel->offermsg.offer.InterfaceInstance,
382 DPRINT_DBG(VMBUS, "child device object allocated - %p",
383 newchannel->device_obj);
386 * Add the new device to the bus. This will kick off device-driver
387 * binding which eventually invokes the device driver's AddDevice()
390 ret = VmbusChildDeviceAdd(newchannel->device_obj);
393 "unable to add child device object (relid %d)",
394 newchannel->offermsg.child_relid);
396 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
397 list_del(&newchannel->listentry);
398 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
400 free_channel(newchannel);
403 * This state is used to indicate a successful open
404 * so that when we do close the channel normally, we
405 * can cleanup properly
407 newchannel->state = CHANNEL_OPEN_STATE;
409 /* Open IC channels */
410 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
411 if (memcmp(&newchannel->offermsg.offer.InterfaceType,
412 &hv_cb_utils[cnt].data,
413 sizeof(struct hv_guid)) == 0 &&
414 vmbus_open(newchannel, 2 * PAGE_SIZE,
415 2 * PAGE_SIZE, NULL, 0,
416 hv_cb_utils[cnt].callback,
418 hv_cb_utils[cnt].channel = newchannel;
419 DPRINT_INFO(VMBUS, "%s",
420 hv_cb_utils[cnt].log_msg);
428 * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
430 * We ignore all offers except network and storage offers. For each network and
431 * storage offers, we create a channel object and queue a work item to the
432 * channel object to process the offer synchronously
434 static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
436 struct vmbus_channel_offer_channel *offer;
437 struct vmbus_channel *newchannel;
438 struct hv_guid *guidtype;
439 struct hv_guid *guidinstance;
443 offer = (struct vmbus_channel_offer_channel *)hdr;
444 for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
445 if (memcmp(&offer->offer.InterfaceType,
446 &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
453 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
454 "child relid %d", offer->child_relid);
458 guidtype = &offer->offer.InterfaceType;
459 guidinstance = &offer->offer.InterfaceInstance;
461 DPRINT_INFO(VMBUS, "Channel offer notification - "
462 "child relid %d monitor id %d allocated %d, "
463 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
464 "%02x%02x%02x%02x%02x%02x%02x%02x} "
465 "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
466 "%02x%02x%02x%02x%02x%02x%02x%02x}",
467 offer->child_relid, offer->monitorid,
468 offer->monitor_allocated,
469 guidtype->data[3], guidtype->data[2],
470 guidtype->data[1], guidtype->data[0],
471 guidtype->data[5], guidtype->data[4],
472 guidtype->data[7], guidtype->data[6],
473 guidtype->data[8], guidtype->data[9],
474 guidtype->data[10], guidtype->data[11],
475 guidtype->data[12], guidtype->data[13],
476 guidtype->data[14], guidtype->data[15],
477 guidinstance->data[3], guidinstance->data[2],
478 guidinstance->data[1], guidinstance->data[0],
479 guidinstance->data[5], guidinstance->data[4],
480 guidinstance->data[7], guidinstance->data[6],
481 guidinstance->data[8], guidinstance->data[9],
482 guidinstance->data[10], guidinstance->data[11],
483 guidinstance->data[12], guidinstance->data[13],
484 guidinstance->data[14], guidinstance->data[15]);
486 /* Allocate the channel object and save this offer. */
487 newchannel = alloc_channel();
489 DPRINT_ERR(VMBUS, "unable to allocate channel object");
493 DPRINT_DBG(VMBUS, "channel object allocated - %p", newchannel);
495 memcpy(&newchannel->offermsg, offer,
496 sizeof(struct vmbus_channel_offer_channel));
497 newchannel->monitor_grp = (u8)offer->monitorid / 32;
498 newchannel->monitor_bit = (u8)offer->monitorid % 32;
500 /* TODO: Make sure the offer comes from our parent partition */
501 INIT_WORK(&newchannel->work, vmbus_process_offer);
502 queue_work(newchannel->controlwq, &newchannel->work);
506 * vmbus_onoffer_rescind - Rescind offer handler.
508 * We queue a work item to process this offer synchronously
510 static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
512 struct vmbus_channel_rescind_offer *rescind;
513 struct vmbus_channel *channel;
515 rescind = (struct vmbus_channel_rescind_offer *)hdr;
516 channel = GetChannelFromRelId(rescind->child_relid);
517 if (channel == NULL) {
518 DPRINT_DBG(VMBUS, "channel not found for relId %d",
519 rescind->child_relid);
523 /* work is initialized for vmbus_process_rescind_offer() from
524 * vmbus_process_offer() where the channel got created */
525 queue_work(channel->controlwq, &channel->work);
529 * vmbus_onoffers_delivered -
530 * This is invoked when all offers have been delivered.
532 * Nothing to do here.
534 static void vmbus_onoffers_delivered(
535 struct vmbus_channel_message_header *hdr)
540 * vmbus_onopen_result - Open result handler.
542 * This is invoked when we received a response to our channel open request.
543 * Find the matching request, copy the response and signal the requesting
546 static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
548 struct vmbus_channel_open_result *result;
549 struct list_head *curr;
550 struct vmbus_channel_msginfo *msginfo;
551 struct vmbus_channel_message_header *requestheader;
552 struct vmbus_channel_open_channel *openmsg;
555 result = (struct vmbus_channel_open_result *)hdr;
556 DPRINT_DBG(VMBUS, "vmbus open result - %d", result->status);
559 * Find the open msg, copy the result and signal/unblock the wait event
561 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
563 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
564 /* FIXME: this should probably use list_entry() instead */
565 msginfo = (struct vmbus_channel_msginfo *)curr;
567 (struct vmbus_channel_message_header *)msginfo->msg;
569 if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
571 (struct vmbus_channel_open_channel *)msginfo->msg;
572 if (openmsg->child_relid == result->child_relid &&
573 openmsg->openid == result->openid) {
574 memcpy(&msginfo->response.open_result,
576 sizeof(struct vmbus_channel_open_result));
577 osd_waitevent_set(msginfo->waitevent);
582 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
586 * vmbus_ongpadl_created - GPADL created handler.
588 * This is invoked when we received a response to our gpadl create request.
589 * Find the matching request, copy the response and signal the requesting
592 static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
594 struct vmbus_channel_gpadl_created *gpadlcreated;
595 struct list_head *curr;
596 struct vmbus_channel_msginfo *msginfo;
597 struct vmbus_channel_message_header *requestheader;
598 struct vmbus_channel_gpadl_header *gpadlheader;
601 gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
602 DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
603 gpadlcreated->creation_status);
606 * Find the establish msg, copy the result and signal/unblock the wait
609 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
611 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
612 /* FIXME: this should probably use list_entry() instead */
613 msginfo = (struct vmbus_channel_msginfo *)curr;
615 (struct vmbus_channel_message_header *)msginfo->msg;
617 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
619 (struct vmbus_channel_gpadl_header *)requestheader;
621 if ((gpadlcreated->child_relid ==
622 gpadlheader->child_relid) &&
623 (gpadlcreated->gpadl == gpadlheader->gpadl)) {
624 memcpy(&msginfo->response.gpadl_created,
626 sizeof(struct vmbus_channel_gpadl_created));
627 osd_waitevent_set(msginfo->waitevent);
632 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
636 * vmbus_ongpadl_torndown - GPADL torndown handler.
638 * This is invoked when we received a response to our gpadl teardown request.
639 * Find the matching request, copy the response and signal the requesting
642 static void vmbus_ongpadl_torndown(
643 struct vmbus_channel_message_header *hdr)
645 struct vmbus_channel_gpadl_torndown *gpadl_torndown;
646 struct list_head *curr;
647 struct vmbus_channel_msginfo *msginfo;
648 struct vmbus_channel_message_header *requestheader;
649 struct vmbus_channel_gpadl_teardown *gpadl_teardown;
652 gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
655 * Find the open msg, copy the result and signal/unblock the wait event
657 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
659 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
660 /* FIXME: this should probably use list_entry() instead */
661 msginfo = (struct vmbus_channel_msginfo *)curr;
663 (struct vmbus_channel_message_header *)msginfo->msg;
665 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
667 (struct vmbus_channel_gpadl_teardown *)requestheader;
669 if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
670 memcpy(&msginfo->response.gpadl_torndown,
672 sizeof(struct vmbus_channel_gpadl_torndown));
673 osd_waitevent_set(msginfo->waitevent);
678 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
682 * vmbus_onversion_response - Version response handler
684 * This is invoked when we received a response to our initiate contact request.
685 * Find the matching request, copy the response and signal the requesting
688 static void vmbus_onversion_response(
689 struct vmbus_channel_message_header *hdr)
691 struct list_head *curr;
692 struct vmbus_channel_msginfo *msginfo;
693 struct vmbus_channel_message_header *requestheader;
694 struct vmbus_channel_initiate_contact *initiate;
695 struct vmbus_channel_version_response *version_response;
698 version_response = (struct vmbus_channel_version_response *)hdr;
699 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
701 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
702 /* FIXME: this should probably use list_entry() instead */
703 msginfo = (struct vmbus_channel_msginfo *)curr;
705 (struct vmbus_channel_message_header *)msginfo->msg;
707 if (requestheader->msgtype ==
708 CHANNELMSG_INITIATE_CONTACT) {
710 (struct vmbus_channel_initiate_contact *)requestheader;
711 memcpy(&msginfo->response.version_response,
713 sizeof(struct vmbus_channel_version_response));
714 osd_waitevent_set(msginfo->waitevent);
717 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
720 /* Channel message dispatch table */
721 static struct vmbus_channel_message_table_entry
722 gChannelMessageTable[CHANNELMSG_COUNT] = {
723 {CHANNELMSG_INVALID, NULL},
724 {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
725 {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
726 {CHANNELMSG_REQUESTOFFERS, NULL},
727 {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
728 {CHANNELMSG_OPENCHANNEL, NULL},
729 {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
730 {CHANNELMSG_CLOSECHANNEL, NULL},
731 {CHANNELMSG_GPADL_HEADER, NULL},
732 {CHANNELMSG_GPADL_BODY, NULL},
733 {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
734 {CHANNELMSG_GPADL_TEARDOWN, NULL},
735 {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
736 {CHANNELMSG_RELID_RELEASED, NULL},
737 {CHANNELMSG_INITIATE_CONTACT, NULL},
738 {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
739 {CHANNELMSG_UNLOAD, NULL},
743 * vmbus_onmessage - Handler for channel protocol messages.
745 * This is invoked in the vmbus worker thread context.
747 void vmbus_onmessage(void *context)
749 struct hv_message *msg = context;
750 struct vmbus_channel_message_header *hdr;
753 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
754 size = msg->header.payload_size;
756 DPRINT_DBG(VMBUS, "message type %d size %d", hdr->msgtype, size);
758 if (hdr->msgtype >= CHANNELMSG_COUNT) {
760 "Received invalid channel message type %d size %d",
762 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
763 (unsigned char *)msg->u.payload, size);
767 if (gChannelMessageTable[hdr->msgtype].messageHandler)
768 gChannelMessageTable[hdr->msgtype].messageHandler(hdr);
770 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
775 * vmbus_request_offers - Send a request to get all our pending offers.
777 int vmbus_request_offers(void)
779 struct vmbus_channel_message_header *msg;
780 struct vmbus_channel_msginfo *msginfo;
783 msginfo = kmalloc(sizeof(*msginfo) +
784 sizeof(struct vmbus_channel_message_header),
789 msginfo->waitevent = osd_waitevent_create();
790 if (!msginfo->waitevent) {
795 msg = (struct vmbus_channel_message_header *)msginfo->msg;
797 msg->msgtype = CHANNELMSG_REQUESTOFFERS;
799 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
800 INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
801 &msgInfo->msgListEntry);
802 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
804 ret = VmbusPostMessage(msg,
805 sizeof(struct vmbus_channel_message_header));
807 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
809 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
810 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
811 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
815 /* osd_waitevent_wait(msgInfo->waitEvent); */
817 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
818 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
819 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
824 kfree(msginfo->waitevent);
832 * vmbus_release_unattached_channels - Release channels that are
833 * unattached/unconnected ie (no drivers associated)
835 void vmbus_release_unattached_channels(void)
837 struct vmbus_channel *channel, *pos;
838 struct vmbus_channel *start = NULL;
841 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
843 list_for_each_entry_safe(channel, pos, &gVmbusConnection.ChannelList,
845 if (channel == start)
848 if (!channel->device_obj->Driver) {
849 list_del(&channel->listentry);
851 "Releasing unattached device object %p",
852 channel->device_obj);
854 vmbus_child_device_unregister(channel->device_obj);
855 free_channel(channel);
862 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);