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 inline void release_channel(void *context)
268 struct vmbus_channel *channel = context;
270 DPRINT_DBG(VMBUS, "releasing channel (%p)", channel);
271 destroy_workqueue(channel->controlwq);
272 DPRINT_DBG(VMBUS, "channel released (%p)", channel);
278 * free_channel - Release the resources used by the vmbus channel object
280 void free_channel(struct vmbus_channel *channel)
282 del_timer_sync(&channel->poll_timer);
285 * We have to release the channel's workqueue/thread in the vmbus's
286 * workqueue/thread context
287 * ie we can't destroy ourselves.
289 osd_schedule_callback(gVmbusConnection.WorkQueue, release_channel,
294 DECLARE_COMPLETION(hv_channel_ready);
297 * Count initialized channels, and ensure all channels are ready when hv_vmbus
298 * module loading completes.
300 static void count_hv_channel(void)
305 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
306 if (++counter == MAX_MSG_TYPES)
307 complete(&hv_channel_ready);
308 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
313 * vmbus_process_offer - Process the offer by creating a channel/device
314 * associated with this offer
316 static void vmbus_process_offer(void *context)
318 struct vmbus_channel *newchannel = context;
319 struct vmbus_channel *channel;
325 /* Make sure this is a new offer */
326 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
328 list_for_each_entry(channel, &gVmbusConnection.ChannelList, listentry) {
329 if (!memcmp(&channel->offermsg.offer.InterfaceType,
330 &newchannel->offermsg.offer.InterfaceType,
331 sizeof(struct hv_guid)) &&
332 !memcmp(&channel->offermsg.offer.InterfaceInstance,
333 &newchannel->offermsg.offer.InterfaceInstance,
334 sizeof(struct hv_guid))) {
341 list_add_tail(&newchannel->listentry,
342 &gVmbusConnection.ChannelList);
344 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
347 DPRINT_DBG(VMBUS, "Ignoring duplicate offer for relid (%d)",
348 newchannel->offermsg.child_relid);
349 free_channel(newchannel);
354 * Start the process of binding this offer to the driver
355 * We need to set the DeviceObject field before calling
356 * VmbusChildDeviceAdd()
358 newchannel->device_obj = VmbusChildDeviceCreate(
359 &newchannel->offermsg.offer.InterfaceType,
360 &newchannel->offermsg.offer.InterfaceInstance,
363 DPRINT_DBG(VMBUS, "child device object allocated - %p",
364 newchannel->device_obj);
367 * Add the new device to the bus. This will kick off device-driver
368 * binding which eventually invokes the device driver's AddDevice()
371 ret = VmbusChildDeviceAdd(newchannel->device_obj);
374 "unable to add child device object (relid %d)",
375 newchannel->offermsg.child_relid);
377 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
378 list_del(&newchannel->listentry);
379 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
381 free_channel(newchannel);
384 * This state is used to indicate a successful open
385 * so that when we do close the channel normally, we
386 * can cleanup properly
388 newchannel->state = CHANNEL_OPEN_STATE;
390 /* Open IC channels */
391 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
392 if (memcmp(&newchannel->offermsg.offer.InterfaceType,
393 &hv_cb_utils[cnt].data,
394 sizeof(struct hv_guid)) == 0 &&
395 vmbus_open(newchannel, 2 * PAGE_SIZE,
396 2 * PAGE_SIZE, NULL, 0,
397 hv_cb_utils[cnt].callback,
399 hv_cb_utils[cnt].channel = newchannel;
400 DPRINT_INFO(VMBUS, "%s",
401 hv_cb_utils[cnt].log_msg);
409 * vmbus_process_rescind_offer -
410 * Rescind the offer by initiating a device removal
412 static void vmbus_process_rescind_offer(void *context)
414 struct vmbus_channel *channel = context;
416 VmbusChildDeviceRemove(channel->device_obj);
420 * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
422 * We ignore all offers except network and storage offers. For each network and
423 * storage offers, we create a channel object and queue a work item to the
424 * channel object to process the offer synchronously
426 static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
428 struct vmbus_channel_offer_channel *offer;
429 struct vmbus_channel *newchannel;
430 struct hv_guid *guidtype;
431 struct hv_guid *guidinstance;
435 offer = (struct vmbus_channel_offer_channel *)hdr;
436 for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
437 if (memcmp(&offer->offer.InterfaceType,
438 &gSupportedDeviceClasses[i], sizeof(struct hv_guid)) == 0) {
445 DPRINT_DBG(VMBUS, "Ignoring channel offer notification for "
446 "child relid %d", offer->child_relid);
450 guidtype = &offer->offer.InterfaceType;
451 guidinstance = &offer->offer.InterfaceInstance;
453 DPRINT_INFO(VMBUS, "Channel offer notification - "
454 "child relid %d monitor id %d allocated %d, "
455 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
456 "%02x%02x%02x%02x%02x%02x%02x%02x} "
457 "instance {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
458 "%02x%02x%02x%02x%02x%02x%02x%02x}",
459 offer->child_relid, offer->monitorid,
460 offer->monitor_allocated,
461 guidtype->data[3], guidtype->data[2],
462 guidtype->data[1], guidtype->data[0],
463 guidtype->data[5], guidtype->data[4],
464 guidtype->data[7], guidtype->data[6],
465 guidtype->data[8], guidtype->data[9],
466 guidtype->data[10], guidtype->data[11],
467 guidtype->data[12], guidtype->data[13],
468 guidtype->data[14], guidtype->data[15],
469 guidinstance->data[3], guidinstance->data[2],
470 guidinstance->data[1], guidinstance->data[0],
471 guidinstance->data[5], guidinstance->data[4],
472 guidinstance->data[7], guidinstance->data[6],
473 guidinstance->data[8], guidinstance->data[9],
474 guidinstance->data[10], guidinstance->data[11],
475 guidinstance->data[12], guidinstance->data[13],
476 guidinstance->data[14], guidinstance->data[15]);
478 /* Allocate the channel object and save this offer. */
479 newchannel = alloc_channel();
481 DPRINT_ERR(VMBUS, "unable to allocate channel object");
485 DPRINT_DBG(VMBUS, "channel object allocated - %p", newchannel);
487 memcpy(&newchannel->offermsg, offer,
488 sizeof(struct vmbus_channel_offer_channel));
489 newchannel->monitor_grp = (u8)offer->monitorid / 32;
490 newchannel->monitor_bit = (u8)offer->monitorid % 32;
492 /* TODO: Make sure the offer comes from our parent partition */
493 osd_schedule_callback(newchannel->controlwq, vmbus_process_offer,
498 * vmbus_onoffer_rescind - Rescind offer handler.
500 * We queue a work item to process this offer synchronously
502 static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
504 struct vmbus_channel_rescind_offer *rescind;
505 struct vmbus_channel *channel;
507 rescind = (struct vmbus_channel_rescind_offer *)hdr;
508 channel = GetChannelFromRelId(rescind->child_relid);
509 if (channel == NULL) {
510 DPRINT_DBG(VMBUS, "channel not found for relId %d",
511 rescind->child_relid);
515 osd_schedule_callback(channel->controlwq,
516 vmbus_process_rescind_offer,
521 * vmbus_onoffers_delivered -
522 * This is invoked when all offers have been delivered.
524 * Nothing to do here.
526 static void vmbus_onoffers_delivered(
527 struct vmbus_channel_message_header *hdr)
532 * vmbus_onopen_result - Open result handler.
534 * This is invoked when we received a response to our channel open request.
535 * Find the matching request, copy the response and signal the requesting
538 static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
540 struct vmbus_channel_open_result *result;
541 struct list_head *curr;
542 struct vmbus_channel_msginfo *msginfo;
543 struct vmbus_channel_message_header *requestheader;
544 struct vmbus_channel_open_channel *openmsg;
547 result = (struct vmbus_channel_open_result *)hdr;
548 DPRINT_DBG(VMBUS, "vmbus open result - %d", result->status);
551 * Find the open msg, copy the result and signal/unblock the wait event
553 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
555 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
556 /* FIXME: this should probably use list_entry() instead */
557 msginfo = (struct vmbus_channel_msginfo *)curr;
559 (struct vmbus_channel_message_header *)msginfo->msg;
561 if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
563 (struct vmbus_channel_open_channel *)msginfo->msg;
564 if (openmsg->child_relid == result->child_relid &&
565 openmsg->openid == result->openid) {
566 memcpy(&msginfo->response.open_result,
568 sizeof(struct vmbus_channel_open_result));
569 osd_waitevent_set(msginfo->waitevent);
574 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
578 * vmbus_ongpadl_created - GPADL created handler.
580 * This is invoked when we received a response to our gpadl create request.
581 * Find the matching request, copy the response and signal the requesting
584 static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
586 struct vmbus_channel_gpadl_created *gpadlcreated;
587 struct list_head *curr;
588 struct vmbus_channel_msginfo *msginfo;
589 struct vmbus_channel_message_header *requestheader;
590 struct vmbus_channel_gpadl_header *gpadlheader;
593 gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
594 DPRINT_DBG(VMBUS, "vmbus gpadl created result - %d",
595 gpadlcreated->creation_status);
598 * Find the establish msg, copy the result and signal/unblock the wait
601 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
603 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
604 /* FIXME: this should probably use list_entry() instead */
605 msginfo = (struct vmbus_channel_msginfo *)curr;
607 (struct vmbus_channel_message_header *)msginfo->msg;
609 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
611 (struct vmbus_channel_gpadl_header *)requestheader;
613 if ((gpadlcreated->child_relid ==
614 gpadlheader->child_relid) &&
615 (gpadlcreated->gpadl == gpadlheader->gpadl)) {
616 memcpy(&msginfo->response.gpadl_created,
618 sizeof(struct vmbus_channel_gpadl_created));
619 osd_waitevent_set(msginfo->waitevent);
624 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
628 * vmbus_ongpadl_torndown - GPADL torndown handler.
630 * This is invoked when we received a response to our gpadl teardown request.
631 * Find the matching request, copy the response and signal the requesting
634 static void vmbus_ongpadl_torndown(
635 struct vmbus_channel_message_header *hdr)
637 struct vmbus_channel_gpadl_torndown *gpadl_torndown;
638 struct list_head *curr;
639 struct vmbus_channel_msginfo *msginfo;
640 struct vmbus_channel_message_header *requestheader;
641 struct vmbus_channel_gpadl_teardown *gpadl_teardown;
644 gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
647 * Find the open msg, copy the result and signal/unblock the wait event
649 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
651 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
652 /* FIXME: this should probably use list_entry() instead */
653 msginfo = (struct vmbus_channel_msginfo *)curr;
655 (struct vmbus_channel_message_header *)msginfo->msg;
657 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
659 (struct vmbus_channel_gpadl_teardown *)requestheader;
661 if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
662 memcpy(&msginfo->response.gpadl_torndown,
664 sizeof(struct vmbus_channel_gpadl_torndown));
665 osd_waitevent_set(msginfo->waitevent);
670 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
674 * vmbus_onversion_response - Version response handler
676 * This is invoked when we received a response to our initiate contact request.
677 * Find the matching request, copy the response and signal the requesting
680 static void vmbus_onversion_response(
681 struct vmbus_channel_message_header *hdr)
683 struct list_head *curr;
684 struct vmbus_channel_msginfo *msginfo;
685 struct vmbus_channel_message_header *requestheader;
686 struct vmbus_channel_initiate_contact *initiate;
687 struct vmbus_channel_version_response *version_response;
690 version_response = (struct vmbus_channel_version_response *)hdr;
691 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
693 list_for_each(curr, &gVmbusConnection.ChannelMsgList) {
694 /* FIXME: this should probably use list_entry() instead */
695 msginfo = (struct vmbus_channel_msginfo *)curr;
697 (struct vmbus_channel_message_header *)msginfo->msg;
699 if (requestheader->msgtype ==
700 CHANNELMSG_INITIATE_CONTACT) {
702 (struct vmbus_channel_initiate_contact *)requestheader;
703 memcpy(&msginfo->response.version_response,
705 sizeof(struct vmbus_channel_version_response));
706 osd_waitevent_set(msginfo->waitevent);
709 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
712 /* Channel message dispatch table */
713 static struct vmbus_channel_message_table_entry
714 gChannelMessageTable[CHANNELMSG_COUNT] = {
715 {CHANNELMSG_INVALID, NULL},
716 {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
717 {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
718 {CHANNELMSG_REQUESTOFFERS, NULL},
719 {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
720 {CHANNELMSG_OPENCHANNEL, NULL},
721 {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
722 {CHANNELMSG_CLOSECHANNEL, NULL},
723 {CHANNELMSG_GPADL_HEADER, NULL},
724 {CHANNELMSG_GPADL_BODY, NULL},
725 {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
726 {CHANNELMSG_GPADL_TEARDOWN, NULL},
727 {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
728 {CHANNELMSG_RELID_RELEASED, NULL},
729 {CHANNELMSG_INITIATE_CONTACT, NULL},
730 {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
731 {CHANNELMSG_UNLOAD, NULL},
735 * vmbus_onmessage - Handler for channel protocol messages.
737 * This is invoked in the vmbus worker thread context.
739 void vmbus_onmessage(void *context)
741 struct hv_message *msg = context;
742 struct vmbus_channel_message_header *hdr;
745 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
746 size = msg->header.payload_size;
748 DPRINT_DBG(VMBUS, "message type %d size %d", hdr->msgtype, size);
750 if (hdr->msgtype >= CHANNELMSG_COUNT) {
752 "Received invalid channel message type %d size %d",
754 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
755 (unsigned char *)msg->u.payload, size);
760 if (gChannelMessageTable[hdr->msgtype].messageHandler)
761 gChannelMessageTable[hdr->msgtype].messageHandler(hdr);
763 DPRINT_ERR(VMBUS, "Unhandled channel message type %d",
766 /* Free the msg that was allocated in VmbusOnMsgDPC() */
771 * vmbus_request_offers - Send a request to get all our pending offers.
773 int vmbus_request_offers(void)
775 struct vmbus_channel_message_header *msg;
776 struct vmbus_channel_msginfo *msginfo;
779 msginfo = kmalloc(sizeof(*msginfo) +
780 sizeof(struct vmbus_channel_message_header),
785 msginfo->waitevent = osd_waitevent_create();
786 if (!msginfo->waitevent) {
791 msg = (struct vmbus_channel_message_header *)msginfo->msg;
793 msg->msgtype = CHANNELMSG_REQUESTOFFERS;
795 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
796 INSERT_TAIL_LIST(&gVmbusConnection.channelMsgList,
797 &msgInfo->msgListEntry);
798 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
800 ret = VmbusPostMessage(msg,
801 sizeof(struct vmbus_channel_message_header));
803 DPRINT_ERR(VMBUS, "Unable to request offers - %d", ret);
805 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
806 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
807 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
811 /* osd_waitevent_wait(msgInfo->waitEvent); */
813 /*SpinlockAcquire(gVmbusConnection.channelMsgLock);
814 REMOVE_ENTRY_LIST(&msgInfo->msgListEntry);
815 SpinlockRelease(gVmbusConnection.channelMsgLock);*/
820 kfree(msginfo->waitevent);
828 * vmbus_release_unattached_channels - Release channels that are
829 * unattached/unconnected ie (no drivers associated)
831 void vmbus_release_unattached_channels(void)
833 struct vmbus_channel *channel, *pos;
834 struct vmbus_channel *start = NULL;
837 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
839 list_for_each_entry_safe(channel, pos, &gVmbusConnection.ChannelList,
841 if (channel == start)
844 if (!channel->device_obj->Driver) {
845 list_del(&channel->listentry);
847 "Releasing unattached device object %p",
848 channel->device_obj);
850 VmbusChildDeviceRemove(channel->device_obj);
851 free_channel(channel);
858 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);