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6
7
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/kernel.h>
12#include <linux/sched.h>
13#include <linux/wait.h>
14#include <linux/mm.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/hyperv.h>
18#include <linux/uio.h>
19#include <linux/interrupt.h>
20#include <asm/page.h>
21#include <asm/mshyperv.h>
22
23#include "hyperv_vmbus.h"
24
25
26
27
28
29
30
31
32
33
34
35
36
37static inline u32 hv_gpadl_size(enum hv_gpadl_type type, u32 size)
38{
39 switch (type) {
40 case HV_GPADL_BUFFER:
41 return size;
42 case HV_GPADL_RING:
43
44 BUG_ON(size % PAGE_SIZE);
45
46
47
48
49
50
51
52
53 return size - 2 * (PAGE_SIZE - HV_HYP_PAGE_SIZE);
54 }
55 BUG();
56 return 0;
57}
58
59
60
61
62
63
64
65
66
67static inline u32 hv_ring_gpadl_send_hvpgoffset(u32 offset)
68{
69
70
71
72
73
74
75
76
77
78
79 return (offset - (PAGE_SIZE - HV_HYP_PAGE_SIZE)) >> HV_HYP_PAGE_SHIFT;
80}
81
82
83
84
85
86
87
88
89
90
91
92
93static inline u64 hv_gpadl_hvpfn(enum hv_gpadl_type type, void *kbuffer,
94 u32 size, u32 send_offset, int i)
95{
96 int send_idx = hv_ring_gpadl_send_hvpgoffset(send_offset);
97 unsigned long delta = 0UL;
98
99 switch (type) {
100 case HV_GPADL_BUFFER:
101 break;
102 case HV_GPADL_RING:
103 if (i == 0)
104 delta = 0;
105 else if (i <= send_idx)
106 delta = PAGE_SIZE - HV_HYP_PAGE_SIZE;
107 else
108 delta = 2 * (PAGE_SIZE - HV_HYP_PAGE_SIZE);
109 break;
110 default:
111 BUG();
112 break;
113 }
114
115 return virt_to_hvpfn(kbuffer + delta + (HV_HYP_PAGE_SIZE * i));
116}
117
118
119
120
121
122void vmbus_setevent(struct vmbus_channel *channel)
123{
124 struct hv_monitor_page *monitorpage;
125
126 trace_vmbus_setevent(channel);
127
128
129
130
131
132 if (channel->offermsg.monitor_allocated && !channel->low_latency) {
133 vmbus_send_interrupt(channel->offermsg.child_relid);
134
135
136 monitorpage = vmbus_connection.monitor_pages[1];
137
138 sync_set_bit(channel->monitor_bit,
139 (unsigned long *)&monitorpage->trigger_group
140 [channel->monitor_grp].pending);
141
142 } else {
143 vmbus_set_event(channel);
144 }
145}
146EXPORT_SYMBOL_GPL(vmbus_setevent);
147
148
149void vmbus_free_ring(struct vmbus_channel *channel)
150{
151 hv_ringbuffer_cleanup(&channel->outbound);
152 hv_ringbuffer_cleanup(&channel->inbound);
153
154 if (channel->ringbuffer_page) {
155 __free_pages(channel->ringbuffer_page,
156 get_order(channel->ringbuffer_pagecount
157 << PAGE_SHIFT));
158 channel->ringbuffer_page = NULL;
159 }
160}
161EXPORT_SYMBOL_GPL(vmbus_free_ring);
162
163
164int vmbus_alloc_ring(struct vmbus_channel *newchannel,
165 u32 send_size, u32 recv_size)
166{
167 struct page *page;
168 int order;
169
170 if (send_size % PAGE_SIZE || recv_size % PAGE_SIZE)
171 return -EINVAL;
172
173
174 order = get_order(send_size + recv_size);
175 page = alloc_pages_node(cpu_to_node(newchannel->target_cpu),
176 GFP_KERNEL|__GFP_ZERO, order);
177
178 if (!page)
179 page = alloc_pages(GFP_KERNEL|__GFP_ZERO, order);
180
181 if (!page)
182 return -ENOMEM;
183
184 newchannel->ringbuffer_page = page;
185 newchannel->ringbuffer_pagecount = (send_size + recv_size) >> PAGE_SHIFT;
186 newchannel->ringbuffer_send_offset = send_size >> PAGE_SHIFT;
187
188 return 0;
189}
190EXPORT_SYMBOL_GPL(vmbus_alloc_ring);
191
192
193int vmbus_send_tl_connect_request(const guid_t *shv_guest_servie_id,
194 const guid_t *shv_host_servie_id)
195{
196 struct vmbus_channel_tl_connect_request conn_msg;
197 int ret;
198
199 memset(&conn_msg, 0, sizeof(conn_msg));
200 conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST;
201 conn_msg.guest_endpoint_id = *shv_guest_servie_id;
202 conn_msg.host_service_id = *shv_host_servie_id;
203
204 ret = vmbus_post_msg(&conn_msg, sizeof(conn_msg), true);
205
206 trace_vmbus_send_tl_connect_request(&conn_msg, ret);
207
208 return ret;
209}
210EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request);
211
212static int send_modifychannel_without_ack(struct vmbus_channel *channel, u32 target_vp)
213{
214 struct vmbus_channel_modifychannel msg;
215 int ret;
216
217 memset(&msg, 0, sizeof(msg));
218 msg.header.msgtype = CHANNELMSG_MODIFYCHANNEL;
219 msg.child_relid = channel->offermsg.child_relid;
220 msg.target_vp = target_vp;
221
222 ret = vmbus_post_msg(&msg, sizeof(msg), true);
223 trace_vmbus_send_modifychannel(&msg, ret);
224
225 return ret;
226}
227
228static int send_modifychannel_with_ack(struct vmbus_channel *channel, u32 target_vp)
229{
230 struct vmbus_channel_modifychannel *msg;
231 struct vmbus_channel_msginfo *info;
232 unsigned long flags;
233 int ret;
234
235 info = kzalloc(sizeof(struct vmbus_channel_msginfo) +
236 sizeof(struct vmbus_channel_modifychannel),
237 GFP_KERNEL);
238 if (!info)
239 return -ENOMEM;
240
241 init_completion(&info->waitevent);
242 info->waiting_channel = channel;
243
244 msg = (struct vmbus_channel_modifychannel *)info->msg;
245 msg->header.msgtype = CHANNELMSG_MODIFYCHANNEL;
246 msg->child_relid = channel->offermsg.child_relid;
247 msg->target_vp = target_vp;
248
249 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
250 list_add_tail(&info->msglistentry, &vmbus_connection.chn_msg_list);
251 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
252
253 ret = vmbus_post_msg(msg, sizeof(*msg), true);
254 trace_vmbus_send_modifychannel(msg, ret);
255 if (ret != 0) {
256 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
257 list_del(&info->msglistentry);
258 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
259 goto free_info;
260 }
261
262
263
264
265
266
267
268
269 mutex_unlock(&vmbus_connection.channel_mutex);
270 wait_for_completion(&info->waitevent);
271 mutex_lock(&vmbus_connection.channel_mutex);
272
273 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
274 list_del(&info->msglistentry);
275 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
276
277 if (info->response.modify_response.status)
278 ret = -EAGAIN;
279
280free_info:
281 kfree(info);
282 return ret;
283}
284
285
286
287
288
289
290
291
292
293
294
295
296
297int vmbus_send_modifychannel(struct vmbus_channel *channel, u32 target_vp)
298{
299 if (vmbus_proto_version >= VERSION_WIN10_V5_3)
300 return send_modifychannel_with_ack(channel, target_vp);
301 return send_modifychannel_without_ack(channel, target_vp);
302}
303EXPORT_SYMBOL_GPL(vmbus_send_modifychannel);
304
305
306
307
308static int create_gpadl_header(enum hv_gpadl_type type, void *kbuffer,
309 u32 size, u32 send_offset,
310 struct vmbus_channel_msginfo **msginfo)
311{
312 int i;
313 int pagecount;
314 struct vmbus_channel_gpadl_header *gpadl_header;
315 struct vmbus_channel_gpadl_body *gpadl_body;
316 struct vmbus_channel_msginfo *msgheader;
317 struct vmbus_channel_msginfo *msgbody = NULL;
318 u32 msgsize;
319
320 int pfnsum, pfncount, pfnleft, pfncurr, pfnsize;
321
322 pagecount = hv_gpadl_size(type, size) >> HV_HYP_PAGE_SHIFT;
323
324
325 pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
326 sizeof(struct vmbus_channel_gpadl_header) -
327 sizeof(struct gpa_range);
328 pfncount = pfnsize / sizeof(u64);
329
330 if (pagecount > pfncount) {
331
332
333 msgsize = sizeof(struct vmbus_channel_msginfo) +
334 sizeof(struct vmbus_channel_gpadl_header) +
335 sizeof(struct gpa_range) + pfncount * sizeof(u64);
336 msgheader = kzalloc(msgsize, GFP_KERNEL);
337 if (!msgheader)
338 goto nomem;
339
340 INIT_LIST_HEAD(&msgheader->submsglist);
341 msgheader->msgsize = msgsize;
342
343 gpadl_header = (struct vmbus_channel_gpadl_header *)
344 msgheader->msg;
345 gpadl_header->rangecount = 1;
346 gpadl_header->range_buflen = sizeof(struct gpa_range) +
347 pagecount * sizeof(u64);
348 gpadl_header->range[0].byte_offset = 0;
349 gpadl_header->range[0].byte_count = hv_gpadl_size(type, size);
350 for (i = 0; i < pfncount; i++)
351 gpadl_header->range[0].pfn_array[i] = hv_gpadl_hvpfn(
352 type, kbuffer, size, send_offset, i);
353 *msginfo = msgheader;
354
355 pfnsum = pfncount;
356 pfnleft = pagecount - pfncount;
357
358
359 pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
360 sizeof(struct vmbus_channel_gpadl_body);
361 pfncount = pfnsize / sizeof(u64);
362
363
364 while (pfnleft) {
365 if (pfnleft > pfncount)
366 pfncurr = pfncount;
367 else
368 pfncurr = pfnleft;
369
370 msgsize = sizeof(struct vmbus_channel_msginfo) +
371 sizeof(struct vmbus_channel_gpadl_body) +
372 pfncurr * sizeof(u64);
373 msgbody = kzalloc(msgsize, GFP_KERNEL);
374
375 if (!msgbody) {
376 struct vmbus_channel_msginfo *pos = NULL;
377 struct vmbus_channel_msginfo *tmp = NULL;
378
379
380
381 list_for_each_entry_safe(pos, tmp,
382 &msgheader->submsglist,
383 msglistentry) {
384
385 list_del(&pos->msglistentry);
386 kfree(pos);
387 }
388
389 goto nomem;
390 }
391
392 msgbody->msgsize = msgsize;
393 gpadl_body =
394 (struct vmbus_channel_gpadl_body *)msgbody->msg;
395
396
397
398
399
400
401
402 for (i = 0; i < pfncurr; i++)
403 gpadl_body->pfn[i] = hv_gpadl_hvpfn(type,
404 kbuffer, size, send_offset, pfnsum + i);
405
406
407 list_add_tail(&msgbody->msglistentry,
408 &msgheader->submsglist);
409 pfnsum += pfncurr;
410 pfnleft -= pfncurr;
411 }
412 } else {
413
414 msgsize = sizeof(struct vmbus_channel_msginfo) +
415 sizeof(struct vmbus_channel_gpadl_header) +
416 sizeof(struct gpa_range) + pagecount * sizeof(u64);
417 msgheader = kzalloc(msgsize, GFP_KERNEL);
418 if (msgheader == NULL)
419 goto nomem;
420
421 INIT_LIST_HEAD(&msgheader->submsglist);
422 msgheader->msgsize = msgsize;
423
424 gpadl_header = (struct vmbus_channel_gpadl_header *)
425 msgheader->msg;
426 gpadl_header->rangecount = 1;
427 gpadl_header->range_buflen = sizeof(struct gpa_range) +
428 pagecount * sizeof(u64);
429 gpadl_header->range[0].byte_offset = 0;
430 gpadl_header->range[0].byte_count = hv_gpadl_size(type, size);
431 for (i = 0; i < pagecount; i++)
432 gpadl_header->range[0].pfn_array[i] = hv_gpadl_hvpfn(
433 type, kbuffer, size, send_offset, i);
434
435 *msginfo = msgheader;
436 }
437
438 return 0;
439nomem:
440 kfree(msgheader);
441 kfree(msgbody);
442 return -ENOMEM;
443}
444
445
446
447
448
449
450
451
452
453
454
455
456static int __vmbus_establish_gpadl(struct vmbus_channel *channel,
457 enum hv_gpadl_type type, void *kbuffer,
458 u32 size, u32 send_offset,
459 u32 *gpadl_handle)
460{
461 struct vmbus_channel_gpadl_header *gpadlmsg;
462 struct vmbus_channel_gpadl_body *gpadl_body;
463 struct vmbus_channel_msginfo *msginfo = NULL;
464 struct vmbus_channel_msginfo *submsginfo, *tmp;
465 struct list_head *curr;
466 u32 next_gpadl_handle;
467 unsigned long flags;
468 int ret = 0;
469
470 next_gpadl_handle =
471 (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1);
472
473 ret = create_gpadl_header(type, kbuffer, size, send_offset, &msginfo);
474 if (ret)
475 return ret;
476
477 init_completion(&msginfo->waitevent);
478 msginfo->waiting_channel = channel;
479
480 gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg;
481 gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER;
482 gpadlmsg->child_relid = channel->offermsg.child_relid;
483 gpadlmsg->gpadl = next_gpadl_handle;
484
485
486 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
487 list_add_tail(&msginfo->msglistentry,
488 &vmbus_connection.chn_msg_list);
489
490 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
491
492 if (channel->rescind) {
493 ret = -ENODEV;
494 goto cleanup;
495 }
496
497 ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize -
498 sizeof(*msginfo), true);
499
500 trace_vmbus_establish_gpadl_header(gpadlmsg, ret);
501
502 if (ret != 0)
503 goto cleanup;
504
505 list_for_each(curr, &msginfo->submsglist) {
506 submsginfo = (struct vmbus_channel_msginfo *)curr;
507 gpadl_body =
508 (struct vmbus_channel_gpadl_body *)submsginfo->msg;
509
510 gpadl_body->header.msgtype =
511 CHANNELMSG_GPADL_BODY;
512 gpadl_body->gpadl = next_gpadl_handle;
513
514 ret = vmbus_post_msg(gpadl_body,
515 submsginfo->msgsize - sizeof(*submsginfo),
516 true);
517
518 trace_vmbus_establish_gpadl_body(gpadl_body, ret);
519
520 if (ret != 0)
521 goto cleanup;
522
523 }
524 wait_for_completion(&msginfo->waitevent);
525
526 if (msginfo->response.gpadl_created.creation_status != 0) {
527 pr_err("Failed to establish GPADL: err = 0x%x\n",
528 msginfo->response.gpadl_created.creation_status);
529
530 ret = -EDQUOT;
531 goto cleanup;
532 }
533
534 if (channel->rescind) {
535 ret = -ENODEV;
536 goto cleanup;
537 }
538
539
540 *gpadl_handle = gpadlmsg->gpadl;
541
542cleanup:
543 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
544 list_del(&msginfo->msglistentry);
545 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
546 list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist,
547 msglistentry) {
548 kfree(submsginfo);
549 }
550
551 kfree(msginfo);
552 return ret;
553}
554
555
556
557
558
559
560
561
562
563int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
564 u32 size, u32 *gpadl_handle)
565{
566 return __vmbus_establish_gpadl(channel, HV_GPADL_BUFFER, kbuffer, size,
567 0U, gpadl_handle);
568}
569EXPORT_SYMBOL_GPL(vmbus_establish_gpadl);
570
571
572
573
574
575
576
577
578static u64 *request_arr_init(u32 size)
579{
580 int i;
581 u64 *req_arr;
582
583 req_arr = kcalloc(size, sizeof(u64), GFP_KERNEL);
584 if (!req_arr)
585 return NULL;
586
587 for (i = 0; i < size - 1; i++)
588 req_arr[i] = i + 1;
589
590
591 req_arr[i] = U64_MAX;
592
593 return req_arr;
594}
595
596
597
598
599
600
601static int vmbus_alloc_requestor(struct vmbus_requestor *rqstor, u32 size)
602{
603 u64 *rqst_arr;
604 unsigned long *bitmap;
605
606 rqst_arr = request_arr_init(size);
607 if (!rqst_arr)
608 return -ENOMEM;
609
610 bitmap = bitmap_zalloc(size, GFP_KERNEL);
611 if (!bitmap) {
612 kfree(rqst_arr);
613 return -ENOMEM;
614 }
615
616 rqstor->req_arr = rqst_arr;
617 rqstor->req_bitmap = bitmap;
618 rqstor->size = size;
619 rqstor->next_request_id = 0;
620 spin_lock_init(&rqstor->req_lock);
621
622 return 0;
623}
624
625
626
627
628
629static void vmbus_free_requestor(struct vmbus_requestor *rqstor)
630{
631 kfree(rqstor->req_arr);
632 bitmap_free(rqstor->req_bitmap);
633}
634
635static int __vmbus_open(struct vmbus_channel *newchannel,
636 void *userdata, u32 userdatalen,
637 void (*onchannelcallback)(void *context), void *context)
638{
639 struct vmbus_channel_open_channel *open_msg;
640 struct vmbus_channel_msginfo *open_info = NULL;
641 struct page *page = newchannel->ringbuffer_page;
642 u32 send_pages, recv_pages;
643 unsigned long flags;
644 int err;
645
646 if (userdatalen > MAX_USER_DEFINED_BYTES)
647 return -EINVAL;
648
649 send_pages = newchannel->ringbuffer_send_offset;
650 recv_pages = newchannel->ringbuffer_pagecount - send_pages;
651
652 if (newchannel->state != CHANNEL_OPEN_STATE)
653 return -EINVAL;
654
655
656 if (newchannel->rqstor_size) {
657 if (vmbus_alloc_requestor(&newchannel->requestor, newchannel->rqstor_size))
658 return -ENOMEM;
659 }
660
661 newchannel->state = CHANNEL_OPENING_STATE;
662 newchannel->onchannel_callback = onchannelcallback;
663 newchannel->channel_callback_context = context;
664
665 if (!newchannel->max_pkt_size)
666 newchannel->max_pkt_size = VMBUS_DEFAULT_MAX_PKT_SIZE;
667
668 err = hv_ringbuffer_init(&newchannel->outbound, page, send_pages, 0);
669 if (err)
670 goto error_clean_ring;
671
672 err = hv_ringbuffer_init(&newchannel->inbound, &page[send_pages],
673 recv_pages, newchannel->max_pkt_size);
674 if (err)
675 goto error_clean_ring;
676
677
678 newchannel->ringbuffer_gpadlhandle = 0;
679
680 err = __vmbus_establish_gpadl(newchannel, HV_GPADL_RING,
681 page_address(newchannel->ringbuffer_page),
682 (send_pages + recv_pages) << PAGE_SHIFT,
683 newchannel->ringbuffer_send_offset << PAGE_SHIFT,
684 &newchannel->ringbuffer_gpadlhandle);
685 if (err)
686 goto error_clean_ring;
687
688
689 open_info = kzalloc(sizeof(*open_info) +
690 sizeof(struct vmbus_channel_open_channel),
691 GFP_KERNEL);
692 if (!open_info) {
693 err = -ENOMEM;
694 goto error_free_gpadl;
695 }
696
697 init_completion(&open_info->waitevent);
698 open_info->waiting_channel = newchannel;
699
700 open_msg = (struct vmbus_channel_open_channel *)open_info->msg;
701 open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL;
702 open_msg->openid = newchannel->offermsg.child_relid;
703 open_msg->child_relid = newchannel->offermsg.child_relid;
704 open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle;
705
706
707
708
709
710 open_msg->downstream_ringbuffer_pageoffset =
711 hv_ring_gpadl_send_hvpgoffset(send_pages << PAGE_SHIFT);
712 open_msg->target_vp = hv_cpu_number_to_vp_number(newchannel->target_cpu);
713
714 if (userdatalen)
715 memcpy(open_msg->userdata, userdata, userdatalen);
716
717 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
718 list_add_tail(&open_info->msglistentry,
719 &vmbus_connection.chn_msg_list);
720 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
721
722 if (newchannel->rescind) {
723 err = -ENODEV;
724 goto error_clean_msglist;
725 }
726
727 err = vmbus_post_msg(open_msg,
728 sizeof(struct vmbus_channel_open_channel), true);
729
730 trace_vmbus_open(open_msg, err);
731
732 if (err != 0)
733 goto error_clean_msglist;
734
735 wait_for_completion(&open_info->waitevent);
736
737 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
738 list_del(&open_info->msglistentry);
739 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
740
741 if (newchannel->rescind) {
742 err = -ENODEV;
743 goto error_free_info;
744 }
745
746 if (open_info->response.open_result.status) {
747 err = -EAGAIN;
748 goto error_free_info;
749 }
750
751 newchannel->state = CHANNEL_OPENED_STATE;
752 kfree(open_info);
753 return 0;
754
755error_clean_msglist:
756 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
757 list_del(&open_info->msglistentry);
758 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
759error_free_info:
760 kfree(open_info);
761error_free_gpadl:
762 vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle);
763 newchannel->ringbuffer_gpadlhandle = 0;
764error_clean_ring:
765 hv_ringbuffer_cleanup(&newchannel->outbound);
766 hv_ringbuffer_cleanup(&newchannel->inbound);
767 vmbus_free_requestor(&newchannel->requestor);
768 newchannel->state = CHANNEL_OPEN_STATE;
769 return err;
770}
771
772
773
774
775int vmbus_connect_ring(struct vmbus_channel *newchannel,
776 void (*onchannelcallback)(void *context), void *context)
777{
778 return __vmbus_open(newchannel, NULL, 0, onchannelcallback, context);
779}
780EXPORT_SYMBOL_GPL(vmbus_connect_ring);
781
782
783
784
785int vmbus_open(struct vmbus_channel *newchannel,
786 u32 send_ringbuffer_size, u32 recv_ringbuffer_size,
787 void *userdata, u32 userdatalen,
788 void (*onchannelcallback)(void *context), void *context)
789{
790 int err;
791
792 err = vmbus_alloc_ring(newchannel, send_ringbuffer_size,
793 recv_ringbuffer_size);
794 if (err)
795 return err;
796
797 err = __vmbus_open(newchannel, userdata, userdatalen,
798 onchannelcallback, context);
799 if (err)
800 vmbus_free_ring(newchannel);
801
802 return err;
803}
804EXPORT_SYMBOL_GPL(vmbus_open);
805
806
807
808
809int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
810{
811 struct vmbus_channel_gpadl_teardown *msg;
812 struct vmbus_channel_msginfo *info;
813 unsigned long flags;
814 int ret;
815
816 info = kzalloc(sizeof(*info) +
817 sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
818 if (!info)
819 return -ENOMEM;
820
821 init_completion(&info->waitevent);
822 info->waiting_channel = channel;
823
824 msg = (struct vmbus_channel_gpadl_teardown *)info->msg;
825
826 msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN;
827 msg->child_relid = channel->offermsg.child_relid;
828 msg->gpadl = gpadl_handle;
829
830 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
831 list_add_tail(&info->msglistentry,
832 &vmbus_connection.chn_msg_list);
833 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
834
835 if (channel->rescind)
836 goto post_msg_err;
837
838 ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_gpadl_teardown),
839 true);
840
841 trace_vmbus_teardown_gpadl(msg, ret);
842
843 if (ret)
844 goto post_msg_err;
845
846 wait_for_completion(&info->waitevent);
847
848post_msg_err:
849
850
851
852
853
854 if (channel->rescind)
855 ret = 0;
856
857 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
858 list_del(&info->msglistentry);
859 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
860
861 kfree(info);
862 return ret;
863}
864EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
865
866void vmbus_reset_channel_cb(struct vmbus_channel *channel)
867{
868 unsigned long flags;
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883 tasklet_disable(&channel->callback_event);
884
885
886 spin_lock_irqsave(&channel->sched_lock, flags);
887 channel->onchannel_callback = NULL;
888 spin_unlock_irqrestore(&channel->sched_lock, flags);
889
890 channel->sc_creation_callback = NULL;
891
892
893 tasklet_enable(&channel->callback_event);
894}
895
896static int vmbus_close_internal(struct vmbus_channel *channel)
897{
898 struct vmbus_channel_close_channel *msg;
899 int ret;
900
901 vmbus_reset_channel_cb(channel);
902
903
904
905
906
907
908
909
910 if (channel->state != CHANNEL_OPENED_STATE)
911 return -EINVAL;
912
913 channel->state = CHANNEL_OPEN_STATE;
914
915
916
917 msg = &channel->close_msg.msg;
918
919 msg->header.msgtype = CHANNELMSG_CLOSECHANNEL;
920 msg->child_relid = channel->offermsg.child_relid;
921
922 ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel),
923 true);
924
925 trace_vmbus_close_internal(msg, ret);
926
927 if (ret) {
928 pr_err("Close failed: close post msg return is %d\n", ret);
929
930
931
932
933 }
934
935
936 else if (channel->ringbuffer_gpadlhandle) {
937 ret = vmbus_teardown_gpadl(channel,
938 channel->ringbuffer_gpadlhandle);
939 if (ret) {
940 pr_err("Close failed: teardown gpadl return %d\n", ret);
941
942
943
944
945 }
946
947 channel->ringbuffer_gpadlhandle = 0;
948 }
949
950 if (!ret)
951 vmbus_free_requestor(&channel->requestor);
952
953 return ret;
954}
955
956
957int vmbus_disconnect_ring(struct vmbus_channel *channel)
958{
959 struct vmbus_channel *cur_channel, *tmp;
960 int ret;
961
962 if (channel->primary_channel != NULL)
963 return -EINVAL;
964
965 list_for_each_entry_safe(cur_channel, tmp, &channel->sc_list, sc_list) {
966 if (cur_channel->rescind)
967 wait_for_completion(&cur_channel->rescind_event);
968
969 mutex_lock(&vmbus_connection.channel_mutex);
970 if (vmbus_close_internal(cur_channel) == 0) {
971 vmbus_free_ring(cur_channel);
972
973 if (cur_channel->rescind)
974 hv_process_channel_removal(cur_channel);
975 }
976 mutex_unlock(&vmbus_connection.channel_mutex);
977 }
978
979
980
981
982 mutex_lock(&vmbus_connection.channel_mutex);
983 ret = vmbus_close_internal(channel);
984 mutex_unlock(&vmbus_connection.channel_mutex);
985
986 return ret;
987}
988EXPORT_SYMBOL_GPL(vmbus_disconnect_ring);
989
990
991
992
993void vmbus_close(struct vmbus_channel *channel)
994{
995 if (vmbus_disconnect_ring(channel) == 0)
996 vmbus_free_ring(channel);
997}
998EXPORT_SYMBOL_GPL(vmbus_close);
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
1016 u32 bufferlen, u64 requestid,
1017 enum vmbus_packet_type type, u32 flags)
1018{
1019 struct vmpacket_descriptor desc;
1020 u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen;
1021 u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
1022 struct kvec bufferlist[3];
1023 u64 aligned_data = 0;
1024 int num_vecs = ((bufferlen != 0) ? 3 : 1);
1025
1026
1027
1028 desc.type = type;
1029 desc.flags = flags;
1030
1031 desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3;
1032 desc.len8 = (u16)(packetlen_aligned >> 3);
1033 desc.trans_id = VMBUS_RQST_ERROR;
1034
1035 bufferlist[0].iov_base = &desc;
1036 bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor);
1037 bufferlist[1].iov_base = buffer;
1038 bufferlist[1].iov_len = bufferlen;
1039 bufferlist[2].iov_base = &aligned_data;
1040 bufferlist[2].iov_len = (packetlen_aligned - packetlen);
1041
1042 return hv_ringbuffer_write(channel, bufferlist, num_vecs, requestid);
1043}
1044EXPORT_SYMBOL(vmbus_sendpacket);
1045
1046
1047
1048
1049
1050
1051
1052
1053int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
1054 struct hv_page_buffer pagebuffers[],
1055 u32 pagecount, void *buffer, u32 bufferlen,
1056 u64 requestid)
1057{
1058 int i;
1059 struct vmbus_channel_packet_page_buffer desc;
1060 u32 descsize;
1061 u32 packetlen;
1062 u32 packetlen_aligned;
1063 struct kvec bufferlist[3];
1064 u64 aligned_data = 0;
1065
1066 if (pagecount > MAX_PAGE_BUFFER_COUNT)
1067 return -EINVAL;
1068
1069
1070
1071
1072
1073 descsize = sizeof(struct vmbus_channel_packet_page_buffer) -
1074 ((MAX_PAGE_BUFFER_COUNT - pagecount) *
1075 sizeof(struct hv_page_buffer));
1076 packetlen = descsize + bufferlen;
1077 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
1078
1079
1080 desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
1081 desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
1082 desc.dataoffset8 = descsize >> 3;
1083 desc.length8 = (u16)(packetlen_aligned >> 3);
1084 desc.transactionid = VMBUS_RQST_ERROR;
1085 desc.reserved = 0;
1086 desc.rangecount = pagecount;
1087
1088 for (i = 0; i < pagecount; i++) {
1089 desc.range[i].len = pagebuffers[i].len;
1090 desc.range[i].offset = pagebuffers[i].offset;
1091 desc.range[i].pfn = pagebuffers[i].pfn;
1092 }
1093
1094 bufferlist[0].iov_base = &desc;
1095 bufferlist[0].iov_len = descsize;
1096 bufferlist[1].iov_base = buffer;
1097 bufferlist[1].iov_len = bufferlen;
1098 bufferlist[2].iov_base = &aligned_data;
1099 bufferlist[2].iov_len = (packetlen_aligned - packetlen);
1100
1101 return hv_ringbuffer_write(channel, bufferlist, 3, requestid);
1102}
1103EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
1104
1105
1106
1107
1108
1109
1110int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
1111 struct vmbus_packet_mpb_array *desc,
1112 u32 desc_size,
1113 void *buffer, u32 bufferlen, u64 requestid)
1114{
1115 u32 packetlen;
1116 u32 packetlen_aligned;
1117 struct kvec bufferlist[3];
1118 u64 aligned_data = 0;
1119
1120 packetlen = desc_size + bufferlen;
1121 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
1122
1123
1124 desc->type = VM_PKT_DATA_USING_GPA_DIRECT;
1125 desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
1126 desc->dataoffset8 = desc_size >> 3;
1127 desc->length8 = (u16)(packetlen_aligned >> 3);
1128 desc->transactionid = VMBUS_RQST_ERROR;
1129 desc->reserved = 0;
1130 desc->rangecount = 1;
1131
1132 bufferlist[0].iov_base = desc;
1133 bufferlist[0].iov_len = desc_size;
1134 bufferlist[1].iov_base = buffer;
1135 bufferlist[1].iov_len = bufferlen;
1136 bufferlist[2].iov_base = &aligned_data;
1137 bufferlist[2].iov_len = (packetlen_aligned - packetlen);
1138
1139 return hv_ringbuffer_write(channel, bufferlist, 3, requestid);
1140}
1141EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc);
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157static inline int
1158__vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
1159 u32 bufferlen, u32 *buffer_actual_len, u64 *requestid,
1160 bool raw)
1161{
1162 return hv_ringbuffer_read(channel, buffer, bufferlen,
1163 buffer_actual_len, requestid, raw);
1164
1165}
1166
1167int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
1168 u32 bufferlen, u32 *buffer_actual_len,
1169 u64 *requestid)
1170{
1171 return __vmbus_recvpacket(channel, buffer, bufferlen,
1172 buffer_actual_len, requestid, false);
1173}
1174EXPORT_SYMBOL(vmbus_recvpacket);
1175
1176
1177
1178
1179int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
1180 u32 bufferlen, u32 *buffer_actual_len,
1181 u64 *requestid)
1182{
1183 return __vmbus_recvpacket(channel, buffer, bufferlen,
1184 buffer_actual_len, requestid, true);
1185}
1186EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);
1187
1188
1189
1190
1191
1192
1193
1194
1195u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr)
1196{
1197 struct vmbus_requestor *rqstor = &channel->requestor;
1198 unsigned long flags;
1199 u64 current_id;
1200
1201
1202 if (!channel->rqstor_size)
1203 return VMBUS_NO_RQSTOR;
1204
1205 spin_lock_irqsave(&rqstor->req_lock, flags);
1206 current_id = rqstor->next_request_id;
1207
1208
1209 if (current_id >= rqstor->size) {
1210 spin_unlock_irqrestore(&rqstor->req_lock, flags);
1211 return VMBUS_RQST_ERROR;
1212 }
1213
1214 rqstor->next_request_id = rqstor->req_arr[current_id];
1215 rqstor->req_arr[current_id] = rqst_addr;
1216
1217
1218 bitmap_set(rqstor->req_bitmap, current_id, 1);
1219
1220 spin_unlock_irqrestore(&rqstor->req_lock, flags);
1221
1222
1223
1224
1225
1226 return current_id + 1;
1227}
1228EXPORT_SYMBOL_GPL(vmbus_next_request_id);
1229
1230
1231
1232
1233
1234
1235
1236
1237u64 vmbus_request_addr(struct vmbus_channel *channel, u64 trans_id)
1238{
1239 struct vmbus_requestor *rqstor = &channel->requestor;
1240 unsigned long flags;
1241 u64 req_addr;
1242
1243
1244 if (!channel->rqstor_size)
1245 return VMBUS_NO_RQSTOR;
1246
1247
1248 if (!trans_id)
1249 return trans_id;
1250
1251 spin_lock_irqsave(&rqstor->req_lock, flags);
1252
1253
1254 trans_id--;
1255
1256
1257 if (trans_id >= rqstor->size || !test_bit(trans_id, rqstor->req_bitmap)) {
1258 spin_unlock_irqrestore(&rqstor->req_lock, flags);
1259 return VMBUS_RQST_ERROR;
1260 }
1261
1262 req_addr = rqstor->req_arr[trans_id];
1263 rqstor->req_arr[trans_id] = rqstor->next_request_id;
1264 rqstor->next_request_id = trans_id;
1265
1266
1267 bitmap_clear(rqstor->req_bitmap, trans_id, 1);
1268
1269 spin_unlock_irqrestore(&rqstor->req_lock, flags);
1270 return req_addr;
1271}
1272EXPORT_SYMBOL_GPL(vmbus_request_addr);
1273