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-rw-r--r--drivers/staging/hv/channel_mgmt.c784
1 files changed, 784 insertions, 0 deletions
diff --git a/drivers/staging/hv/channel_mgmt.c b/drivers/staging/hv/channel_mgmt.c
new file mode 100644
index 00000000000..bf011f3fb85
--- /dev/null
+++ b/drivers/staging/hv/channel_mgmt.c
@@ -0,0 +1,784 @@
1/*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 */
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include <linux/kernel.h>
24#include <linux/sched.h>
25#include <linux/wait.h>
26#include <linux/mm.h>
27#include <linux/slab.h>
28#include <linux/list.h>
29#include <linux/module.h>
30#include <linux/completion.h>
31
32#include "hyperv.h"
33#include "hyperv_vmbus.h"
34
35struct vmbus_channel_message_table_entry {
36 enum vmbus_channel_message_type message_type;
37 void (*message_handler)(struct vmbus_channel_message_header *msg);
38};
39
40#define MAX_MSG_TYPES 4
41#define MAX_NUM_DEVICE_CLASSES_SUPPORTED 8
42
43static const struct hv_guid
44 supported_device_classes[MAX_NUM_DEVICE_CLASSES_SUPPORTED] = {
45 /* {ba6163d9-04a1-4d29-b605-72e2ffb1dc7f} */
46 /* Storage - SCSI */
47 {
48 .data = {
49 0xd9, 0x63, 0x61, 0xba, 0xa1, 0x04, 0x29, 0x4d,
50 0xb6, 0x05, 0x72, 0xe2, 0xff, 0xb1, 0xdc, 0x7f
51 }
52 },
53
54 /* {F8615163-DF3E-46c5-913F-F2D2F965ED0E} */
55 /* Network */
56 {
57 .data = {
58 0x63, 0x51, 0x61, 0xF8, 0x3E, 0xDF, 0xc5, 0x46,
59 0x91, 0x3F, 0xF2, 0xD2, 0xF9, 0x65, 0xED, 0x0E
60 }
61 },
62
63 /* {CFA8B69E-5B4A-4cc0-B98B-8BA1A1F3F95A} */
64 /* Input */
65 {
66 .data = {
67 0x9E, 0xB6, 0xA8, 0xCF, 0x4A, 0x5B, 0xc0, 0x4c,
68 0xB9, 0x8B, 0x8B, 0xA1, 0xA1, 0xF3, 0xF9, 0x5A
69 }
70 },
71
72 /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
73 /* IDE */
74 {
75 .data = {
76 0x32, 0x26, 0x41, 0x32, 0xcb, 0x86, 0xa2, 0x44,
77 0x9b, 0x5c, 0x50, 0xd1, 0x41, 0x73, 0x54, 0xf5
78 }
79 },
80 /* 0E0B6031-5213-4934-818B-38D90CED39DB */
81 /* Shutdown */
82 {
83 .data = {
84 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
85 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
86 }
87 },
88 /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
89 /* TimeSync */
90 {
91 .data = {
92 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
93 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
94 }
95 },
96 /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
97 /* Heartbeat */
98 {
99 .data = {
100 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
101 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
102 }
103 },
104 /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
105 /* KVP */
106 {
107 .data = {
108 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
109 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
110 }
111 },
112
113};
114
115
116/**
117 * prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
118 * @icmsghdrp: Pointer to msg header structure
119 * @icmsg_negotiate: Pointer to negotiate message structure
120 * @buf: Raw buffer channel data
121 *
122 * @icmsghdrp is of type &struct icmsg_hdr.
123 * @negop is of type &struct icmsg_negotiate.
124 * Set up and fill in default negotiate response message. This response can
125 * come from both the vmbus driver and the hv_utils driver. The current api
126 * will respond properly to both Windows 2008 and Windows 2008-R2 operating
127 * systems.
128 *
129 * Mainly used by Hyper-V drivers.
130 */
131void prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
132 struct icmsg_negotiate *negop,
133 u8 *buf)
134{
135 if (icmsghdrp->icmsgtype == ICMSGTYPE_NEGOTIATE) {
136 icmsghdrp->icmsgsize = 0x10;
137
138 negop = (struct icmsg_negotiate *)&buf[
139 sizeof(struct vmbuspipe_hdr) +
140 sizeof(struct icmsg_hdr)];
141
142 if (negop->icframe_vercnt == 2 &&
143 negop->icversion_data[1].major == 3) {
144 negop->icversion_data[0].major = 3;
145 negop->icversion_data[0].minor = 0;
146 negop->icversion_data[1].major = 3;
147 negop->icversion_data[1].minor = 0;
148 } else {
149 negop->icversion_data[0].major = 1;
150 negop->icversion_data[0].minor = 0;
151 negop->icversion_data[1].major = 1;
152 negop->icversion_data[1].minor = 0;
153 }
154
155 negop->icframe_vercnt = 1;
156 negop->icmsg_vercnt = 1;
157 }
158}
159EXPORT_SYMBOL(prep_negotiate_resp);
160
161/**
162 * chn_cb_negotiate() - Default handler for non IDE/SCSI/NETWORK
163 * Hyper-V requests
164 * @context: Pointer to argument structure.
165 *
166 * Set up the default handler for non device driver specific requests
167 * from Hyper-V. This stub responds to the default negotiate messages
168 * that come in for every non IDE/SCSI/Network request.
169 * This behavior is normally overwritten in the hv_utils driver. That
170 * driver handles requests like graceful shutdown, heartbeats etc.
171 *
172 * Mainly used by Hyper-V drivers.
173 */
174void chn_cb_negotiate(void *context)
175{
176 struct vmbus_channel *channel = context;
177 u8 *buf;
178 u32 buflen, recvlen;
179 u64 requestid;
180
181 struct icmsg_hdr *icmsghdrp;
182 struct icmsg_negotiate *negop = NULL;
183
184 if (channel->util_index >= 0) {
185 /*
186 * This is a properly initialized util channel.
187 * Route this callback appropriately and setup state
188 * so that we don't need to reroute again.
189 */
190 if (hv_cb_utils[channel->util_index].callback != NULL) {
191 /*
192 * The util driver has established a handler for
193 * this service; do the magic.
194 */
195 channel->onchannel_callback =
196 hv_cb_utils[channel->util_index].callback;
197 (hv_cb_utils[channel->util_index].callback)(channel);
198 return;
199 }
200 }
201
202 buflen = PAGE_SIZE;
203 buf = kmalloc(buflen, GFP_ATOMIC);
204
205 vmbus_recvpacket(channel, buf, buflen, &recvlen, &requestid);
206
207 if (recvlen > 0) {
208 icmsghdrp = (struct icmsg_hdr *)&buf[
209 sizeof(struct vmbuspipe_hdr)];
210
211 prep_negotiate_resp(icmsghdrp, negop, buf);
212
213 icmsghdrp->icflags = ICMSGHDRFLAG_TRANSACTION
214 | ICMSGHDRFLAG_RESPONSE;
215
216 vmbus_sendpacket(channel, buf,
217 recvlen, requestid,
218 VM_PKT_DATA_INBAND, 0);
219 }
220
221 kfree(buf);
222}
223EXPORT_SYMBOL(chn_cb_negotiate);
224
225/*
226 * Function table used for message responses for non IDE/SCSI/Network type
227 * messages. (Such as KVP/Shutdown etc)
228 */
229struct hyperv_service_callback hv_cb_utils[MAX_MSG_TYPES] = {
230 /* 0E0B6031-5213-4934-818B-38D90CED39DB */
231 /* Shutdown */
232 {
233 .msg_type = HV_SHUTDOWN_MSG,
234 .data = {
235 0x31, 0x60, 0x0B, 0X0E, 0x13, 0x52, 0x34, 0x49,
236 0x81, 0x8B, 0x38, 0XD9, 0x0C, 0xED, 0x39, 0xDB
237 },
238 .log_msg = "Shutdown channel functionality initialized"
239 },
240
241 /* {9527E630-D0AE-497b-ADCE-E80AB0175CAF} */
242 /* TimeSync */
243 {
244 .msg_type = HV_TIMESYNC_MSG,
245 .data = {
246 0x30, 0xe6, 0x27, 0x95, 0xae, 0xd0, 0x7b, 0x49,
247 0xad, 0xce, 0xe8, 0x0a, 0xb0, 0x17, 0x5c, 0xaf
248 },
249 .log_msg = "Timesync channel functionality initialized"
250 },
251 /* {57164f39-9115-4e78-ab55-382f3bd5422d} */
252 /* Heartbeat */
253 {
254 .msg_type = HV_HEARTBEAT_MSG,
255 .data = {
256 0x39, 0x4f, 0x16, 0x57, 0x15, 0x91, 0x78, 0x4e,
257 0xab, 0x55, 0x38, 0x2f, 0x3b, 0xd5, 0x42, 0x2d
258 },
259 .log_msg = "Heartbeat channel functionality initialized"
260 },
261 /* {A9A0F4E7-5A45-4d96-B827-8A841E8C03E6} */
262 /* KVP */
263 {
264 .data = {
265 0xe7, 0xf4, 0xa0, 0xa9, 0x45, 0x5a, 0x96, 0x4d,
266 0xb8, 0x27, 0x8a, 0x84, 0x1e, 0x8c, 0x3, 0xe6
267 },
268 .log_msg = "KVP channel functionality initialized"
269 },
270};
271EXPORT_SYMBOL(hv_cb_utils);
272
273/*
274 * alloc_channel - Allocate and initialize a vmbus channel object
275 */
276static struct vmbus_channel *alloc_channel(void)
277{
278 struct vmbus_channel *channel;
279
280 channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
281 if (!channel)
282 return NULL;
283
284 spin_lock_init(&channel->inbound_lock);
285
286 channel->controlwq = create_workqueue("hv_vmbus_ctl");
287 if (!channel->controlwq) {
288 kfree(channel);
289 return NULL;
290 }
291
292 return channel;
293}
294
295/*
296 * release_hannel - Release the vmbus channel object itself
297 */
298static void release_channel(struct work_struct *work)
299{
300 struct vmbus_channel *channel = container_of(work,
301 struct vmbus_channel,
302 work);
303
304 destroy_workqueue(channel->controlwq);
305
306 kfree(channel);
307}
308
309/*
310 * free_channel - Release the resources used by the vmbus channel object
311 */
312void free_channel(struct vmbus_channel *channel)
313{
314
315 /*
316 * We have to release the channel's workqueue/thread in the vmbus's
317 * workqueue/thread context
318 * ie we can't destroy ourselves.
319 */
320 INIT_WORK(&channel->work, release_channel);
321 queue_work(vmbus_connection.work_queue, &channel->work);
322}
323
324
325
326/*
327 * vmbus_process_rescind_offer -
328 * Rescind the offer by initiating a device removal
329 */
330static void vmbus_process_rescind_offer(struct work_struct *work)
331{
332 struct vmbus_channel *channel = container_of(work,
333 struct vmbus_channel,
334 work);
335
336 vmbus_child_device_unregister(channel->device_obj);
337}
338
339/*
340 * vmbus_process_offer - Process the offer by creating a channel/device
341 * associated with this offer
342 */
343static void vmbus_process_offer(struct work_struct *work)
344{
345 struct vmbus_channel *newchannel = container_of(work,
346 struct vmbus_channel,
347 work);
348 struct vmbus_channel *channel;
349 bool fnew = true;
350 int ret;
351 int cnt;
352 unsigned long flags;
353
354 /* The next possible work is rescind handling */
355 INIT_WORK(&newchannel->work, vmbus_process_rescind_offer);
356
357 /* Make sure this is a new offer */
358 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
359
360 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
361 if (!memcmp(&channel->offermsg.offer.if_type,
362 &newchannel->offermsg.offer.if_type,
363 sizeof(struct hv_guid)) &&
364 !memcmp(&channel->offermsg.offer.if_instance,
365 &newchannel->offermsg.offer.if_instance,
366 sizeof(struct hv_guid))) {
367 fnew = false;
368 break;
369 }
370 }
371
372 if (fnew)
373 list_add_tail(&newchannel->listentry,
374 &vmbus_connection.chn_list);
375
376 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
377
378 if (!fnew) {
379 free_channel(newchannel);
380 return;
381 }
382
383 /*
384 * Start the process of binding this offer to the driver
385 * We need to set the DeviceObject field before calling
386 * vmbus_child_dev_add()
387 */
388 newchannel->device_obj = vmbus_child_device_create(
389 &newchannel->offermsg.offer.if_type,
390 &newchannel->offermsg.offer.if_instance,
391 newchannel);
392
393 /*
394 * Add the new device to the bus. This will kick off device-driver
395 * binding which eventually invokes the device driver's AddDevice()
396 * method.
397 */
398 ret = vmbus_child_device_register(newchannel->device_obj);
399 if (ret != 0) {
400 pr_err("unable to add child device object (relid %d)\n",
401 newchannel->offermsg.child_relid);
402
403 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
404 list_del(&newchannel->listentry);
405 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
406
407 free_channel(newchannel);
408 } else {
409 /*
410 * This state is used to indicate a successful open
411 * so that when we do close the channel normally, we
412 * can cleanup properly
413 */
414 newchannel->state = CHANNEL_OPEN_STATE;
415 newchannel->util_index = -1; /* Invalid index */
416
417 /* Open IC channels */
418 for (cnt = 0; cnt < MAX_MSG_TYPES; cnt++) {
419 if (memcmp(&newchannel->offermsg.offer.if_type,
420 &hv_cb_utils[cnt].data,
421 sizeof(struct hv_guid)) == 0 &&
422 vmbus_open(newchannel, 2 * PAGE_SIZE,
423 2 * PAGE_SIZE, NULL, 0,
424 chn_cb_negotiate,
425 newchannel) == 0) {
426 hv_cb_utils[cnt].channel = newchannel;
427 newchannel->util_index = cnt;
428
429 pr_info("%s\n", hv_cb_utils[cnt].log_msg);
430
431 }
432 }
433 }
434}
435
436/*
437 * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
438 *
439 * We ignore all offers except network and storage offers. For each network and
440 * storage offers, we create a channel object and queue a work item to the
441 * channel object to process the offer synchronously
442 */
443static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
444{
445 struct vmbus_channel_offer_channel *offer;
446 struct vmbus_channel *newchannel;
447 struct hv_guid *guidtype;
448 struct hv_guid *guidinstance;
449 int i;
450 int fsupported = 0;
451
452 offer = (struct vmbus_channel_offer_channel *)hdr;
453 for (i = 0; i < MAX_NUM_DEVICE_CLASSES_SUPPORTED; i++) {
454 if (memcmp(&offer->offer.if_type,
455 &supported_device_classes[i],
456 sizeof(struct hv_guid)) == 0) {
457 fsupported = 1;
458 break;
459 }
460 }
461
462 if (!fsupported)
463 return;
464
465 guidtype = &offer->offer.if_type;
466 guidinstance = &offer->offer.if_instance;
467
468 /* Allocate the channel object and save this offer. */
469 newchannel = alloc_channel();
470 if (!newchannel) {
471 pr_err("Unable to allocate channel object\n");
472 return;
473 }
474
475 memcpy(&newchannel->offermsg, offer,
476 sizeof(struct vmbus_channel_offer_channel));
477 newchannel->monitor_grp = (u8)offer->monitorid / 32;
478 newchannel->monitor_bit = (u8)offer->monitorid % 32;
479
480 INIT_WORK(&newchannel->work, vmbus_process_offer);
481 queue_work(newchannel->controlwq, &newchannel->work);
482}
483
484/*
485 * vmbus_onoffer_rescind - Rescind offer handler.
486 *
487 * We queue a work item to process this offer synchronously
488 */
489static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
490{
491 struct vmbus_channel_rescind_offer *rescind;
492 struct vmbus_channel *channel;
493
494 rescind = (struct vmbus_channel_rescind_offer *)hdr;
495 channel = relid2channel(rescind->child_relid);
496
497 if (channel == NULL)
498 /* Just return here, no channel found */
499 return;
500
501 /* work is initialized for vmbus_process_rescind_offer() from
502 * vmbus_process_offer() where the channel got created */
503 queue_work(channel->controlwq, &channel->work);
504}
505
506/*
507 * vmbus_onoffers_delivered -
508 * This is invoked when all offers have been delivered.
509 *
510 * Nothing to do here.
511 */
512static void vmbus_onoffers_delivered(
513 struct vmbus_channel_message_header *hdr)
514{
515}
516
517/*
518 * vmbus_onopen_result - Open result handler.
519 *
520 * This is invoked when we received a response to our channel open request.
521 * Find the matching request, copy the response and signal the requesting
522 * thread.
523 */
524static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
525{
526 struct vmbus_channel_open_result *result;
527 struct vmbus_channel_msginfo *msginfo;
528 struct vmbus_channel_message_header *requestheader;
529 struct vmbus_channel_open_channel *openmsg;
530 unsigned long flags;
531
532 result = (struct vmbus_channel_open_result *)hdr;
533
534 /*
535 * Find the open msg, copy the result and signal/unblock the wait event
536 */
537 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
538
539 list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
540 msglistentry) {
541 requestheader =
542 (struct vmbus_channel_message_header *)msginfo->msg;
543
544 if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
545 openmsg =
546 (struct vmbus_channel_open_channel *)msginfo->msg;
547 if (openmsg->child_relid == result->child_relid &&
548 openmsg->openid == result->openid) {
549 memcpy(&msginfo->response.open_result,
550 result,
551 sizeof(
552 struct vmbus_channel_open_result));
553 complete(&msginfo->waitevent);
554 break;
555 }
556 }
557 }
558 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
559}
560
561/*
562 * vmbus_ongpadl_created - GPADL created handler.
563 *
564 * This is invoked when we received a response to our gpadl create request.
565 * Find the matching request, copy the response and signal the requesting
566 * thread.
567 */
568static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
569{
570 struct vmbus_channel_gpadl_created *gpadlcreated;
571 struct vmbus_channel_msginfo *msginfo;
572 struct vmbus_channel_message_header *requestheader;
573 struct vmbus_channel_gpadl_header *gpadlheader;
574 unsigned long flags;
575
576 gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
577
578 /*
579 * Find the establish msg, copy the result and signal/unblock the wait
580 * event
581 */
582 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
583
584 list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
585 msglistentry) {
586 requestheader =
587 (struct vmbus_channel_message_header *)msginfo->msg;
588
589 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
590 gpadlheader =
591 (struct vmbus_channel_gpadl_header *)requestheader;
592
593 if ((gpadlcreated->child_relid ==
594 gpadlheader->child_relid) &&
595 (gpadlcreated->gpadl == gpadlheader->gpadl)) {
596 memcpy(&msginfo->response.gpadl_created,
597 gpadlcreated,
598 sizeof(
599 struct vmbus_channel_gpadl_created));
600 complete(&msginfo->waitevent);
601 break;
602 }
603 }
604 }
605 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
606}
607
608/*
609 * vmbus_ongpadl_torndown - GPADL torndown handler.
610 *
611 * This is invoked when we received a response to our gpadl teardown request.
612 * Find the matching request, copy the response and signal the requesting
613 * thread.
614 */
615static void vmbus_ongpadl_torndown(
616 struct vmbus_channel_message_header *hdr)
617{
618 struct vmbus_channel_gpadl_torndown *gpadl_torndown;
619 struct vmbus_channel_msginfo *msginfo;
620 struct vmbus_channel_message_header *requestheader;
621 struct vmbus_channel_gpadl_teardown *gpadl_teardown;
622 unsigned long flags;
623
624 gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
625
626 /*
627 * Find the open msg, copy the result and signal/unblock the wait event
628 */
629 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
630
631 list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
632 msglistentry) {
633 requestheader =
634 (struct vmbus_channel_message_header *)msginfo->msg;
635
636 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
637 gpadl_teardown =
638 (struct vmbus_channel_gpadl_teardown *)requestheader;
639
640 if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
641 memcpy(&msginfo->response.gpadl_torndown,
642 gpadl_torndown,
643 sizeof(
644 struct vmbus_channel_gpadl_torndown));
645 complete(&msginfo->waitevent);
646 break;
647 }
648 }
649 }
650 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
651}
652
653/*
654 * vmbus_onversion_response - Version response handler
655 *
656 * This is invoked when we received a response to our initiate contact request.
657 * Find the matching request, copy the response and signal the requesting
658 * thread.
659 */
660static void vmbus_onversion_response(
661 struct vmbus_channel_message_header *hdr)
662{
663 struct vmbus_channel_msginfo *msginfo;
664 struct vmbus_channel_message_header *requestheader;
665 struct vmbus_channel_initiate_contact *initiate;
666 struct vmbus_channel_version_response *version_response;
667 unsigned long flags;
668
669 version_response = (struct vmbus_channel_version_response *)hdr;
670 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
671
672 list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
673 msglistentry) {
674 requestheader =
675 (struct vmbus_channel_message_header *)msginfo->msg;
676
677 if (requestheader->msgtype ==
678 CHANNELMSG_INITIATE_CONTACT) {
679 initiate =
680 (struct vmbus_channel_initiate_contact *)requestheader;
681 memcpy(&msginfo->response.version_response,
682 version_response,
683 sizeof(struct vmbus_channel_version_response));
684 complete(&msginfo->waitevent);
685 }
686 }
687 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
688}
689
690/* Channel message dispatch table */
691static struct vmbus_channel_message_table_entry
692 channel_message_table[CHANNELMSG_COUNT] = {
693 {CHANNELMSG_INVALID, NULL},
694 {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
695 {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
696 {CHANNELMSG_REQUESTOFFERS, NULL},
697 {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
698 {CHANNELMSG_OPENCHANNEL, NULL},
699 {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
700 {CHANNELMSG_CLOSECHANNEL, NULL},
701 {CHANNELMSG_GPADL_HEADER, NULL},
702 {CHANNELMSG_GPADL_BODY, NULL},
703 {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
704 {CHANNELMSG_GPADL_TEARDOWN, NULL},
705 {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
706 {CHANNELMSG_RELID_RELEASED, NULL},
707 {CHANNELMSG_INITIATE_CONTACT, NULL},
708 {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
709 {CHANNELMSG_UNLOAD, NULL},
710};
711
712/*
713 * vmbus_onmessage - Handler for channel protocol messages.
714 *
715 * This is invoked in the vmbus worker thread context.
716 */
717void vmbus_onmessage(void *context)
718{
719 struct hv_message *msg = context;
720 struct vmbus_channel_message_header *hdr;
721 int size;
722
723 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
724 size = msg->header.payload_size;
725
726 if (hdr->msgtype >= CHANNELMSG_COUNT) {
727 pr_err("Received invalid channel message type %d size %d\n",
728 hdr->msgtype, size);
729 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
730 (unsigned char *)msg->u.payload, size);
731 return;
732 }
733
734 if (channel_message_table[hdr->msgtype].message_handler)
735 channel_message_table[hdr->msgtype].message_handler(hdr);
736 else
737 pr_err("Unhandled channel message type %d\n", hdr->msgtype);
738}
739
740/*
741 * vmbus_request_offers - Send a request to get all our pending offers.
742 */
743int vmbus_request_offers(void)
744{
745 struct vmbus_channel_message_header *msg;
746 struct vmbus_channel_msginfo *msginfo;
747 int ret, t;
748
749 msginfo = kmalloc(sizeof(*msginfo) +
750 sizeof(struct vmbus_channel_message_header),
751 GFP_KERNEL);
752 if (!msginfo)
753 return -ENOMEM;
754
755 init_completion(&msginfo->waitevent);
756
757 msg = (struct vmbus_channel_message_header *)msginfo->msg;
758
759 msg->msgtype = CHANNELMSG_REQUESTOFFERS;
760
761
762 ret = vmbus_post_msg(msg,
763 sizeof(struct vmbus_channel_message_header));
764 if (ret != 0) {
765 pr_err("Unable to request offers - %d\n", ret);
766
767 goto cleanup;
768 }
769
770 t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
771 if (t == 0) {
772 ret = -ETIMEDOUT;
773 goto cleanup;
774 }
775
776
777
778cleanup:
779 kfree(msginfo);
780
781 return ret;
782}
783
784/* eof */
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-20 05:18:59 -0400