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Staging: hv: remove Close from struct vmbus_channel_interface
[deliverable/linux.git] / drivers / staging / hv / channel.c
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CommitLineData
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#include <linux/kernel.h>
22#include <linux/mm.h>
23#include <linux/slab.h>
24#include <linux/module.h>
25#include "osd.h"
26#include "logging.h"
27#include "vmbus_private.h"
28
29/* Internal routines */
30static int create_gpadl_header(
31 void *kbuffer, /* must be phys and virt contiguous */
32 u32 size, /* page-size multiple */
33 struct vmbus_channel_msginfo **msginfo,
34 u32 *messagecount);
35static void dump_vmbus_channel(struct vmbus_channel *channel);
36static void vmbus_setevent(struct vmbus_channel *channel);
37
38
39#if 0
40static void DumpMonitorPage(struct hv_monitor_page *MonitorPage)
41{
42 int i = 0;
43 int j = 0;
44
45 DPRINT_DBG(VMBUS, "monitorPage - %p, trigger state - %d",
46 MonitorPage, MonitorPage->TriggerState);
47
48 for (i = 0; i < 4; i++)
49 DPRINT_DBG(VMBUS, "trigger group (%d) - %llx", i,
50 MonitorPage->TriggerGroup[i].AsUINT64);
51
52 for (i = 0; i < 4; i++) {
53 for (j = 0; j < 32; j++) {
54 DPRINT_DBG(VMBUS, "latency (%d)(%d) - %llx", i, j,
55 MonitorPage->Latency[i][j]);
56 }
57 }
58 for (i = 0; i < 4; i++) {
59 for (j = 0; j < 32; j++) {
60 DPRINT_DBG(VMBUS, "param-conn id (%d)(%d) - %d", i, j,
61 MonitorPage->Parameter[i][j].ConnectionId.Asu32);
62 DPRINT_DBG(VMBUS, "param-flag (%d)(%d) - %d", i, j,
63 MonitorPage->Parameter[i][j].FlagNumber);
64 }
65 }
66}
67#endif
68
69/*
70 * vmbus_setevent- Trigger an event notification on the specified
71 * channel.
72 */
73static void vmbus_setevent(struct vmbus_channel *channel)
74{
75 struct hv_monitor_page *monitorpage;
76
77 if (channel->OfferMsg.MonitorAllocated) {
78 /* Each u32 represents 32 channels */
79 set_bit(channel->OfferMsg.ChildRelId & 31,
80 (unsigned long *) gVmbusConnection.SendInterruptPage +
81 (channel->OfferMsg.ChildRelId >> 5));
82
83 monitorpage = gVmbusConnection.MonitorPages;
84 monitorpage++; /* Get the child to parent monitor page */
85
86 set_bit(channel->MonitorBit,
87 (unsigned long *)&monitorpage->TriggerGroup
88 [channel->MonitorGroup].Pending);
89
90 } else {
91 VmbusSetEvent(channel->OfferMsg.ChildRelId);
92 }
93}
94
95#if 0
96static void VmbusChannelClearEvent(struct vmbus_channel *channel)
97{
98 struct hv_monitor_page *monitorPage;
99
100 if (Channel->OfferMsg.MonitorAllocated) {
101 /* Each u32 represents 32 channels */
102 clear_bit(Channel->OfferMsg.ChildRelId & 31,
103 (unsigned long *)gVmbusConnection.SendInterruptPage +
104 (Channel->OfferMsg.ChildRelId >> 5));
105
106 monitorPage =
107 (struct hv_monitor_page *)gVmbusConnection.MonitorPages;
108 monitorPage++; /* Get the child to parent monitor page */
109
110 clear_bit(Channel->MonitorBit,
111 (unsigned long *)&monitorPage->TriggerGroup
112 [Channel->MonitorGroup].Pending);
113 }
114}
115
116#endif
117/*
118 * vmbus_get_debug_info -Retrieve various channel debug info
119 */
120void vmbus_get_debug_info(struct vmbus_channel *channel,
121 struct vmbus_channel_debug_info *debuginfo)
122{
123 struct hv_monitor_page *monitorpage;
124 u8 monitor_group = (u8)channel->OfferMsg.MonitorId / 32;
125 u8 monitor_offset = (u8)channel->OfferMsg.MonitorId % 32;
126 /* u32 monitorBit = 1 << monitorOffset; */
127
128 debuginfo->RelId = channel->OfferMsg.ChildRelId;
129 debuginfo->State = channel->State;
130 memcpy(&debuginfo->InterfaceType,
131 &channel->OfferMsg.Offer.InterfaceType, sizeof(struct hv_guid));
132 memcpy(&debuginfo->InterfaceInstance,
133 &channel->OfferMsg.Offer.InterfaceInstance,
134 sizeof(struct hv_guid));
135
136 monitorpage = (struct hv_monitor_page *)gVmbusConnection.MonitorPages;
137
138 debuginfo->MonitorId = channel->OfferMsg.MonitorId;
139
140 debuginfo->ServerMonitorPending =
141 monitorpage->TriggerGroup[monitor_group].Pending;
142 debuginfo->ServerMonitorLatency =
143 monitorpage->Latency[monitor_group][monitor_offset];
144 debuginfo->ServerMonitorConnectionId =
145 monitorpage->Parameter[monitor_group]
146 [monitor_offset].ConnectionId.u.Id;
147
148 monitorpage++;
149
150 debuginfo->ClientMonitorPending =
151 monitorpage->TriggerGroup[monitor_group].Pending;
152 debuginfo->ClientMonitorLatency =
153 monitorpage->Latency[monitor_group][monitor_offset];
154 debuginfo->ClientMonitorConnectionId =
155 monitorpage->Parameter[monitor_group]
156 [monitor_offset].ConnectionId.u.Id;
157
158 RingBufferGetDebugInfo(&channel->Inbound, &debuginfo->Inbound);
159 RingBufferGetDebugInfo(&channel->Outbound, &debuginfo->Outbound);
160}
161
162/*
163 * vmbus_open - Open the specified channel.
164 */
165int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
166 u32 recv_ringbuffer_size, void *userdata, u32 userdatalen,
167 void (*onchannelcallback)(void *context), void *context)
168{
169 struct vmbus_channel_open_channel *openMsg;
170 struct vmbus_channel_msginfo *openInfo = NULL;
171 void *in, *out;
172 unsigned long flags;
173 int ret, err = 0;
174
175 /* Aligned to page size */
176 /* ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1))); */
177 /* ASSERT(!(RecvRingBufferSize & (PAGE_SIZE - 1))); */
178
179 newchannel->OnChannelCallback = onchannelcallback;
180 newchannel->ChannelCallbackContext = context;
181
182 /* Allocate the ring buffer */
183 out = osd_PageAlloc((send_ringbuffer_size + recv_ringbuffer_size)
184 >> PAGE_SHIFT);
185 if (!out)
186 return -ENOMEM;
187
188 /* ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0); */
189
190 in = (void *)((unsigned long)out + send_ringbuffer_size);
191
192 newchannel->RingBufferPages = out;
193 newchannel->RingBufferPageCount = (send_ringbuffer_size +
194 recv_ringbuffer_size) >> PAGE_SHIFT;
195
196 ret = RingBufferInit(&newchannel->Outbound, out, send_ringbuffer_size);
197 if (ret != 0) {
198 err = ret;
199 goto errorout;
200 }
201
202 ret = RingBufferInit(&newchannel->Inbound, in, recv_ringbuffer_size);
203 if (ret != 0) {
204 err = ret;
205 goto errorout;
206 }
207
208
209 /* Establish the gpadl for the ring buffer */
210 DPRINT_DBG(VMBUS, "Establishing ring buffer's gpadl for channel %p...",
211 newchannel);
212
213 newchannel->RingBufferGpadlHandle = 0;
214
215 ret = vmbus_establish_gpadl(newchannel,
216 newchannel->Outbound.RingBuffer,
217 send_ringbuffer_size +
218 recv_ringbuffer_size,
219 &newchannel->RingBufferGpadlHandle);
220
221 if (ret != 0) {
222 err = ret;
223 goto errorout;
224 }
225
226 DPRINT_DBG(VMBUS, "channel %p <relid %d gpadl 0x%x send ring %p "
227 "size %d recv ring %p size %d, downstreamoffset %d>",
228 newchannel, newchannel->OfferMsg.ChildRelId,
229 newchannel->RingBufferGpadlHandle,
230 newchannel->Outbound.RingBuffer,
231 newchannel->Outbound.RingSize,
232 newchannel->Inbound.RingBuffer,
233 newchannel->Inbound.RingSize,
234 send_ringbuffer_size);
235
236 /* Create and init the channel open message */
237 openInfo = kmalloc(sizeof(*openInfo) +
238 sizeof(struct vmbus_channel_open_channel),
239 GFP_KERNEL);
240 if (!openInfo) {
241 err = -ENOMEM;
242 goto errorout;
243 }
244
245 openInfo->WaitEvent = osd_WaitEventCreate();
246 if (!openInfo->WaitEvent) {
247 err = -ENOMEM;
248 goto errorout;
249 }
250
251 openMsg = (struct vmbus_channel_open_channel *)openInfo->Msg;
252 openMsg->Header.MessageType = ChannelMessageOpenChannel;
253 openMsg->OpenId = newchannel->OfferMsg.ChildRelId; /* FIXME */
254 openMsg->ChildRelId = newchannel->OfferMsg.ChildRelId;
255 openMsg->RingBufferGpadlHandle = newchannel->RingBufferGpadlHandle;
256 openMsg->DownstreamRingBufferPageOffset = send_ringbuffer_size >>
257 PAGE_SHIFT;
258 openMsg->ServerContextAreaGpadlHandle = 0; /* TODO */
259
260 if (userdatalen > MAX_USER_DEFINED_BYTES) {
261 err = -EINVAL;
262 goto errorout;
263 }
264
265 if (userdatalen)
266 memcpy(openMsg->UserData, userdata, userdatalen);
267
268 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
269 list_add_tail(&openInfo->MsgListEntry,
270 &gVmbusConnection.ChannelMsgList);
271 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
272
273 DPRINT_DBG(VMBUS, "Sending channel open msg...");
274
275 ret = VmbusPostMessage(openMsg,
276 sizeof(struct vmbus_channel_open_channel));
277 if (ret != 0) {
278 DPRINT_ERR(VMBUS, "unable to open channel - %d", ret);
279 goto Cleanup;
280 }
281
282 /* FIXME: Need to time-out here */
283 osd_WaitEventWait(openInfo->WaitEvent);
284
285 if (openInfo->Response.OpenResult.Status == 0)
286 DPRINT_INFO(VMBUS, "channel <%p> open success!!", newchannel);
287 else
288 DPRINT_INFO(VMBUS, "channel <%p> open failed - %d!!",
289 newchannel, openInfo->Response.OpenResult.Status);
290
291Cleanup:
292 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
293 list_del(&openInfo->MsgListEntry);
294 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
295
296 kfree(openInfo->WaitEvent);
297 kfree(openInfo);
298 return 0;
299
300errorout:
301 RingBufferCleanup(&newchannel->Outbound);
302 RingBufferCleanup(&newchannel->Inbound);
303 osd_PageFree(out, (send_ringbuffer_size + recv_ringbuffer_size)
304 >> PAGE_SHIFT);
305 kfree(openInfo);
306 return err;
307}
308
309/*
310 * dump_gpadl_body - Dump the gpadl body message to the console for
311 * debugging purposes.
312 */
313static void dump_gpadl_body(struct vmbus_channel_gpadl_body *gpadl, u32 len)
314{
315 int i;
316 int pfncount;
317
318 pfncount = (len - sizeof(struct vmbus_channel_gpadl_body)) /
319 sizeof(u64);
320 DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", len, pfncount);
321
322 for (i = 0; i < pfncount; i++)
323 DPRINT_DBG(VMBUS, "gpadl body - %d) pfn %llu",
324 i, gpadl->Pfn[i]);
325}
326
327/*
328 * dump_gpadl_header - Dump the gpadl header message to the console for
329 * debugging purposes.
330 */
331static void dump_gpadl_header(struct vmbus_channel_gpadl_header *gpadl)
332{
333 int i, j;
334 int pagecount;
335
336 DPRINT_DBG(VMBUS,
337 "gpadl header - relid %d, range count %d, range buflen %d",
338 gpadl->ChildRelId, gpadl->RangeCount, gpadl->RangeBufLen);
339 for (i = 0; i < gpadl->RangeCount; i++) {
340 pagecount = gpadl->Range[i].ByteCount >> PAGE_SHIFT;
341 pagecount = (pagecount > 26) ? 26 : pagecount;
342
343 DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d "
344 "page count %d", i, gpadl->Range[i].ByteCount,
345 gpadl->Range[i].ByteOffset, pagecount);
346
347 for (j = 0; j < pagecount; j++)
348 DPRINT_DBG(VMBUS, "%d) pfn %llu", j,
349 gpadl->Range[i].PfnArray[j]);
350 }
351}
352
353/*
354 * create_gpadl_header - Creates a gpadl for the specified buffer
355 */
356static int create_gpadl_header(void *kbuffer, u32 size,
357 struct vmbus_channel_msginfo **msginfo,
358 u32 *messagecount)
359{
360 int i;
361 int pagecount;
362 unsigned long long pfn;
363 struct vmbus_channel_gpadl_header *gpadl_header;
364 struct vmbus_channel_gpadl_body *gpadl_body;
365 struct vmbus_channel_msginfo *msgheader;
366 struct vmbus_channel_msginfo *msgbody = NULL;
367 u32 msgsize;
368
369 int pfnsum, pfncount, pfnleft, pfncurr, pfnsize;
370
371 /* ASSERT((kbuffer & (PAGE_SIZE-1)) == 0); */
372 /* ASSERT((Size & (PAGE_SIZE-1)) == 0); */
373
374 pagecount = size >> PAGE_SHIFT;
375 pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT;
376
377 /* do we need a gpadl body msg */
378 pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
379 sizeof(struct vmbus_channel_gpadl_header) -
380 sizeof(struct gpa_range);
381 pfncount = pfnsize / sizeof(u64);
382
383 if (pagecount > pfncount) {
384 /* we need a gpadl body */
385 /* fill in the header */
386 msgsize = sizeof(struct vmbus_channel_msginfo) +
387 sizeof(struct vmbus_channel_gpadl_header) +
388 sizeof(struct gpa_range) + pfncount * sizeof(u64);
389 msgheader = kzalloc(msgsize, GFP_KERNEL);
390 if (!msgheader)
391 goto nomem;
392
393 INIT_LIST_HEAD(&msgheader->SubMsgList);
394 msgheader->MessageSize = msgsize;
395
396 gpadl_header = (struct vmbus_channel_gpadl_header *)
397 msgheader->Msg;
398 gpadl_header->RangeCount = 1;
399 gpadl_header->RangeBufLen = sizeof(struct gpa_range) +
400 pagecount * sizeof(u64);
401 gpadl_header->Range[0].ByteOffset = 0;
402 gpadl_header->Range[0].ByteCount = size;
403 for (i = 0; i < pfncount; i++)
404 gpadl_header->Range[0].PfnArray[i] = pfn+i;
405 *msginfo = msgheader;
406 *messagecount = 1;
407
408 pfnsum = pfncount;
409 pfnleft = pagecount - pfncount;
410
411 /* how many pfns can we fit */
412 pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
413 sizeof(struct vmbus_channel_gpadl_body);
414 pfncount = pfnsize / sizeof(u64);
415
416 /* fill in the body */
417 while (pfnleft) {
418 if (pfnleft > pfncount)
419 pfncurr = pfncount;
420 else
421 pfncurr = pfnleft;
422
423 msgsize = sizeof(struct vmbus_channel_msginfo) +
424 sizeof(struct vmbus_channel_gpadl_body) +
425 pfncurr * sizeof(u64);
426 msgbody = kzalloc(msgsize, GFP_KERNEL);
427 /* FIXME: we probably need to more if this fails */
428 if (!msgbody)
429 goto nomem;
430 msgbody->MessageSize = msgsize;
431 (*messagecount)++;
432 gpadl_body =
433 (struct vmbus_channel_gpadl_body *)msgbody->Msg;
434
435 /*
436 * FIXME:
437 * Gpadl is u32 and we are using a pointer which could
438 * be 64-bit
439 */
440 /* gpadl_body->Gpadl = kbuffer; */
441 for (i = 0; i < pfncurr; i++)
442 gpadl_body->Pfn[i] = pfn + pfnsum + i;
443
444 /* add to msg header */
445 list_add_tail(&msgbody->MsgListEntry,
446 &msgheader->SubMsgList);
447 pfnsum += pfncurr;
448 pfnleft -= pfncurr;
449 }
450 } else {
451 /* everything fits in a header */
452 msgsize = sizeof(struct vmbus_channel_msginfo) +
453 sizeof(struct vmbus_channel_gpadl_header) +
454 sizeof(struct gpa_range) + pagecount * sizeof(u64);
455 msgheader = kzalloc(msgsize, GFP_KERNEL);
456 if (msgheader == NULL)
457 goto nomem;
458 msgheader->MessageSize = msgsize;
459
460 gpadl_header = (struct vmbus_channel_gpadl_header *)
461 msgheader->Msg;
462 gpadl_header->RangeCount = 1;
463 gpadl_header->RangeBufLen = sizeof(struct gpa_range) +
464 pagecount * sizeof(u64);
465 gpadl_header->Range[0].ByteOffset = 0;
466 gpadl_header->Range[0].ByteCount = size;
467 for (i = 0; i < pagecount; i++)
468 gpadl_header->Range[0].PfnArray[i] = pfn+i;
469
470 *msginfo = msgheader;
471 *messagecount = 1;
472 }
473
474 return 0;
475nomem:
476 kfree(msgheader);
477 kfree(msgbody);
478 return -ENOMEM;
479}
480
481/*
482 * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer
483 *
484 * @channel: a channel
485 * @kbuffer: from kmalloc
486 * @size: page-size multiple
487 * @gpadl_handle: some funky thing
488 */
489int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
490 u32 size, u32 *gpadl_handle)
491{
492 struct vmbus_channel_gpadl_header *gpadlmsg;
493 struct vmbus_channel_gpadl_body *gpadl_body;
494 /* struct vmbus_channel_gpadl_created *gpadlCreated; */
495 struct vmbus_channel_msginfo *msginfo = NULL;
496 struct vmbus_channel_msginfo *submsginfo;
497 u32 msgcount;
498 struct list_head *curr;
499 u32 next_gpadl_handle;
500 unsigned long flags;
501 int ret = 0;
502
503 next_gpadl_handle = atomic_read(&gVmbusConnection.NextGpadlHandle);
504 atomic_inc(&gVmbusConnection.NextGpadlHandle);
505
506 ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount);
507 if (ret)
508 return ret;
509
510 msginfo->WaitEvent = osd_WaitEventCreate();
511 if (!msginfo->WaitEvent) {
512 ret = -ENOMEM;
513 goto Cleanup;
514 }
515
516 gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->Msg;
517 gpadlmsg->Header.MessageType = ChannelMessageGpadlHeader;
518 gpadlmsg->ChildRelId = channel->OfferMsg.ChildRelId;
519 gpadlmsg->Gpadl = next_gpadl_handle;
520
521 dump_gpadl_header(gpadlmsg);
522
523 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
524 list_add_tail(&msginfo->MsgListEntry,
525 &gVmbusConnection.ChannelMsgList);
526
527 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
528 DPRINT_DBG(VMBUS, "buffer %p, size %d msg cnt %d",
529 kbuffer, size, msgcount);
530
531 DPRINT_DBG(VMBUS, "Sending GPADL Header - len %zd",
532 msginfo->MessageSize - sizeof(*msginfo));
533
534 ret = VmbusPostMessage(gpadlmsg, msginfo->MessageSize -
535 sizeof(*msginfo));
536 if (ret != 0) {
537 DPRINT_ERR(VMBUS, "Unable to open channel - %d", ret);
538 goto Cleanup;
539 }
540
541 if (msgcount > 1) {
542 list_for_each(curr, &msginfo->SubMsgList) {
543
544 /* FIXME: should this use list_entry() instead ? */
545 submsginfo = (struct vmbus_channel_msginfo *)curr;
546 gpadl_body =
547 (struct vmbus_channel_gpadl_body *)submsginfo->Msg;
548
549 gpadl_body->Header.MessageType =
550 ChannelMessageGpadlBody;
551 gpadl_body->Gpadl = next_gpadl_handle;
552
553 DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd",
554 submsginfo->MessageSize -
555 sizeof(*submsginfo));
556
557 dump_gpadl_body(gpadl_body, submsginfo->MessageSize -
558 sizeof(*submsginfo));
559 ret = VmbusPostMessage(gpadl_body,
560 submsginfo->MessageSize -
561 sizeof(*submsginfo));
562 if (ret != 0)
563 goto Cleanup;
564
565 }
566 }
567 osd_WaitEventWait(msginfo->WaitEvent);
568
569 /* At this point, we received the gpadl created msg */
570 DPRINT_DBG(VMBUS, "Received GPADL created "
571 "(relid %d, status %d handle %x)",
572 channel->OfferMsg.ChildRelId,
573 msginfo->Response.GpadlCreated.CreationStatus,
574 gpadlmsg->Gpadl);
575
576 *gpadl_handle = gpadlmsg->Gpadl;
577
578Cleanup:
579 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
580 list_del(&msginfo->MsgListEntry);
581 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
582
583 kfree(msginfo->WaitEvent);
584 kfree(msginfo);
585 return ret;
586}
587EXPORT_SYMBOL_GPL(vmbus_establish_gpadl);
588
589/*
590 * vmbus_teardown_gpadl -Teardown the specified GPADL handle
591 */
592int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
593{
594 struct vmbus_channel_gpadl_teardown *msg;
595 struct vmbus_channel_msginfo *info;
596 unsigned long flags;
597 int ret;
598
599 /* ASSERT(gpadl_handle != 0); */
600
601 info = kmalloc(sizeof(*info) +
602 sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
603 if (!info)
604 return -ENOMEM;
605
606 info->WaitEvent = osd_WaitEventCreate();
607 if (!info->WaitEvent) {
608 kfree(info);
609 return -ENOMEM;
610 }
611
612 msg = (struct vmbus_channel_gpadl_teardown *)info->Msg;
613
614 msg->Header.MessageType = ChannelMessageGpadlTeardown;
615 msg->ChildRelId = channel->OfferMsg.ChildRelId;
616 msg->Gpadl = gpadl_handle;
617
618 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
619 list_add_tail(&info->MsgListEntry,
620 &gVmbusConnection.ChannelMsgList);
621 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
622
623 ret = VmbusPostMessage(msg,
624 sizeof(struct vmbus_channel_gpadl_teardown));
625 if (ret != 0) {
626 /* TODO: */
627 /* something... */
628 }
629
630 osd_WaitEventWait(info->WaitEvent);
631
632 /* Received a torndown response */
633 spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags);
634 list_del(&info->MsgListEntry);
635 spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags);
636
637 kfree(info->WaitEvent);
638 kfree(info);
639 return ret;
640}
641EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
642
643/*
644 * vmbus_close - Close the specified channel
645 */
646void vmbus_close(struct vmbus_channel *channel)
647{
648 struct vmbus_channel_close_channel *msg;
649 struct vmbus_channel_msginfo *info;
650 unsigned long flags;
651 int ret;
652
653 /* Stop callback and cancel the timer asap */
654 channel->OnChannelCallback = NULL;
655 del_timer_sync(&channel->poll_timer);
656
657 /* Send a closing message */
658 info = kmalloc(sizeof(*info) +
659 sizeof(struct vmbus_channel_close_channel), GFP_KERNEL);
660 /* FIXME: can't do anything other than return here because the
661 * function is void */
662 if (!info)
663 return;
664
665 /* info->waitEvent = osd_WaitEventCreate(); */
666
667 msg = (struct vmbus_channel_close_channel *)info->Msg;
668 msg->Header.MessageType = ChannelMessageCloseChannel;
669 msg->ChildRelId = channel->OfferMsg.ChildRelId;
670
671 ret = VmbusPostMessage(msg, sizeof(struct vmbus_channel_close_channel));
672 if (ret != 0) {
673 /* TODO: */
674 /* something... */
675 }
676
677 /* Tear down the gpadl for the channel's ring buffer */
678 if (channel->RingBufferGpadlHandle)
679 vmbus_teardown_gpadl(channel,
680 channel->RingBufferGpadlHandle);
681
682 /* TODO: Send a msg to release the childRelId */
683
684 /* Cleanup the ring buffers for this channel */
685 RingBufferCleanup(&channel->Outbound);
686 RingBufferCleanup(&channel->Inbound);
687
688 osd_PageFree(channel->RingBufferPages, channel->RingBufferPageCount);
689
690 kfree(info);
691
692 /*
693 * If we are closing the channel during an error path in
694 * opening the channel, don't free the channel since the
695 * caller will free the channel
696 */
697
698 if (channel->State == CHANNEL_OPEN_STATE) {
699 spin_lock_irqsave(&gVmbusConnection.channel_lock, flags);
700 list_del(&channel->ListEntry);
701 spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags);
702
703 free_channel(channel);
704 }
705}
706EXPORT_SYMBOL_GPL(vmbus_close);
707
708/**
709 * vmbus_sendpacket() - Send the specified buffer on the given channel
710 * @channel: Pointer to vmbus_channel structure.
711 * @buffer: Pointer to the buffer you want to receive the data into.
712 * @bufferlen: Maximum size of what the the buffer will hold
713 * @requestid: Identifier of the request
714 * @type: Type of packet that is being send e.g. negotiate, time
715 * packet etc.
716 *
717 * Sends data in @buffer directly to hyper-v via the vmbus
718 * This will send the data unparsed to hyper-v.
719 *
720 * Mainly used by Hyper-V drivers.
721 */
722int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer,
723 u32 bufferlen, u64 requestid,
724 enum vmbus_packet_type type, u32 flags)
725{
726 struct vmpacket_descriptor desc;
727 u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen;
728 u32 packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64));
729 struct scatterlist bufferlist[3];
730 u64 aligned_data = 0;
731 int ret;
732
733 DPRINT_DBG(VMBUS, "channel %p buffer %p len %d",
734 channel, buffer, bufferlen);
735
736 dump_vmbus_channel(channel);
737
738 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
739
740 /* Setup the descriptor */
741 desc.Type = type; /* VmbusPacketTypeDataInBand; */
742 desc.Flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
743 /* in 8-bytes granularity */
744 desc.DataOffset8 = sizeof(struct vmpacket_descriptor) >> 3;
745 desc.Length8 = (u16)(packetlen_aligned >> 3);
746 desc.TransactionId = requestid;
747
748 sg_init_table(bufferlist, 3);
749 sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor));
750 sg_set_buf(&bufferlist[1], buffer, bufferlen);
751 sg_set_buf(&bufferlist[2], &aligned_data,
752 packetlen_aligned - packetlen);
753
754 ret = RingBufferWrite(&channel->Outbound, bufferlist, 3);
755
756 /* TODO: We should determine if this is optional */
757 if (ret == 0 && !GetRingBufferInterruptMask(&channel->Outbound))
758 vmbus_setevent(channel);
759
760 return ret;
761}
762EXPORT_SYMBOL(vmbus_sendpacket);
763
764/*
765 * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
766 * packets using a GPADL Direct packet type.
767 */
768int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
769 struct hv_page_buffer pagebuffers[],
770 u32 pagecount, void *buffer, u32 bufferlen,
771 u64 requestid)
772{
773 int ret;
774 int i;
775 struct vmbus_channel_packet_page_buffer desc;
776 u32 descsize;
777 u32 packetlen;
778 u32 packetlen_aligned;
779 struct scatterlist bufferlist[3];
780 u64 aligned_data = 0;
781
782 if (pagecount > MAX_PAGE_BUFFER_COUNT)
783 return -EINVAL;
784
785 dump_vmbus_channel(channel);
786
787 /*
788 * Adjust the size down since vmbus_channel_packet_page_buffer is the
789 * largest size we support
790 */
791 descsize = sizeof(struct vmbus_channel_packet_page_buffer) -
792 ((MAX_PAGE_BUFFER_COUNT - pagecount) *
793 sizeof(struct hv_page_buffer));
794 packetlen = descsize + bufferlen;
795 packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64));
796
797 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
798
799 /* Setup the descriptor */
800 desc.type = VmbusPacketTypeDataUsingGpaDirect;
801 desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
802 desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
803 desc.length8 = (u16)(packetlen_aligned >> 3);
804 desc.transactionid = requestid;
805 desc.rangecount = pagecount;
806
807 for (i = 0; i < pagecount; i++) {
808 desc.range[i].Length = pagebuffers[i].Length;
809 desc.range[i].Offset = pagebuffers[i].Offset;
810 desc.range[i].Pfn = pagebuffers[i].Pfn;
811 }
812
813 sg_init_table(bufferlist, 3);
814 sg_set_buf(&bufferlist[0], &desc, descsize);
815 sg_set_buf(&bufferlist[1], buffer, bufferlen);
816 sg_set_buf(&bufferlist[2], &aligned_data,
817 packetlen_aligned - packetlen);
818
819 ret = RingBufferWrite(&channel->Outbound, bufferlist, 3);
820
821 /* TODO: We should determine if this is optional */
822 if (ret == 0 && !GetRingBufferInterruptMask(&channel->Outbound))
823 vmbus_setevent(channel);
824
825 return ret;
826}
827EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
828
829/*
830 * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
831 * using a GPADL Direct packet type.
832 */
833int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
834 struct hv_multipage_buffer *multi_pagebuffer,
835 void *buffer, u32 bufferlen, u64 requestid)
836{
837 int ret;
838 struct vmbus_channel_packet_multipage_buffer desc;
839 u32 descsize;
840 u32 packetlen;
841 u32 packetlen_aligned;
842 struct scatterlist bufferlist[3];
843 u64 aligned_data = 0;
844 u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->Offset,
845 multi_pagebuffer->Length);
846
847 dump_vmbus_channel(channel);
848
849 DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u",
850 multi_pagebuffer->Offset,
851 multi_pagebuffer->Length, pfncount);
852
853 if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT))
854 return -EINVAL;
855
856 /*
857 * Adjust the size down since vmbus_channel_packet_multipage_buffer is
858 * the largest size we support
859 */
860 descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) -
861 ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) *
862 sizeof(u64));
863 packetlen = descsize + bufferlen;
864 packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64));
865
866 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
867
868 /* Setup the descriptor */
869 desc.type = VmbusPacketTypeDataUsingGpaDirect;
870 desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
871 desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
872 desc.length8 = (u16)(packetlen_aligned >> 3);
873 desc.transactionid = requestid;
874 desc.rangecount = 1;
875
876 desc.range.Length = multi_pagebuffer->Length;
877 desc.range.Offset = multi_pagebuffer->Offset;
878
879 memcpy(desc.range.PfnArray, multi_pagebuffer->PfnArray,
880 pfncount * sizeof(u64));
881
882 sg_init_table(bufferlist, 3);
883 sg_set_buf(&bufferlist[0], &desc, descsize);
884 sg_set_buf(&bufferlist[1], buffer, bufferlen);
885 sg_set_buf(&bufferlist[2], &aligned_data,
886 packetlen_aligned - packetlen);
887
888 ret = RingBufferWrite(&channel->Outbound, bufferlist, 3);
889
890 /* TODO: We should determine if this is optional */
891 if (ret == 0 && !GetRingBufferInterruptMask(&channel->Outbound))
892 vmbus_setevent(channel);
893
894 return ret;
895}
896EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer);
897
898/**
899 * vmbus_recvpacket() - Retrieve the user packet on the specified channel
900 * @channel: Pointer to vmbus_channel structure.
901 * @buffer: Pointer to the buffer you want to receive the data into.
902 * @bufferlen: Maximum size of what the the buffer will hold
903 * @buffer_actual_len: The actual size of the data after it was received
904 * @requestid: Identifier of the request
905 *
906 * Receives directly from the hyper-v vmbus and puts the data it received
907 * into Buffer. This will receive the data unparsed from hyper-v.
908 *
909 * Mainly used by Hyper-V drivers.
910 */
911int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
912 u32 bufferlen, u32 *buffer_actual_len, u64 *requestid)
913{
914 struct vmpacket_descriptor desc;
915 u32 packetlen;
916 u32 userlen;
917 int ret;
918 unsigned long flags;
919
920 *buffer_actual_len = 0;
921 *requestid = 0;
922
923 spin_lock_irqsave(&channel->inbound_lock, flags);
924
925 ret = RingBufferPeek(&channel->Inbound, &desc,
926 sizeof(struct vmpacket_descriptor));
927 if (ret != 0) {
928 spin_unlock_irqrestore(&channel->inbound_lock, flags);
929
930 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
931 return 0;
932 }
933
934 /* VmbusChannelClearEvent(Channel); */
935
936 packetlen = desc.Length8 << 3;
937 userlen = packetlen - (desc.DataOffset8 << 3);
938 /* ASSERT(userLen > 0); */
939
940 DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d "
941 "flag %d tid %llx pktlen %d datalen %d> ",
942 channel, channel->OfferMsg.ChildRelId, desc.Type,
943 desc.Flags, desc.TransactionId, packetlen, userlen);
944
945 *buffer_actual_len = userlen;
946
947 if (userlen > bufferlen) {
948 spin_unlock_irqrestore(&channel->inbound_lock, flags);
949
950 DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d",
951 bufferlen, userlen);
952 return -1;
953 }
954
955 *requestid = desc.TransactionId;
956
957 /* Copy over the packet to the user buffer */
958 ret = RingBufferRead(&channel->Inbound, buffer, userlen,
959 (desc.DataOffset8 << 3));
960
961 spin_unlock_irqrestore(&channel->inbound_lock, flags);
962
963 return 0;
964}
965EXPORT_SYMBOL(vmbus_recvpacket);
966
967/*
968 * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel
969 */
970int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
971 u32 bufferlen, u32 *buffer_actual_len,
972 u64 *requestid)
973{
974 struct vmpacket_descriptor desc;
975 u32 packetlen;
976 u32 userlen;
977 int ret;
978 unsigned long flags;
979
980 *buffer_actual_len = 0;
981 *requestid = 0;
982
983 spin_lock_irqsave(&channel->inbound_lock, flags);
984
985 ret = RingBufferPeek(&channel->Inbound, &desc,
986 sizeof(struct vmpacket_descriptor));
987 if (ret != 0) {
988 spin_unlock_irqrestore(&channel->inbound_lock, flags);
989
990 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
991 return 0;
992 }
993
994 /* VmbusChannelClearEvent(Channel); */
995
996 packetlen = desc.Length8 << 3;
997 userlen = packetlen - (desc.DataOffset8 << 3);
998
999 DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d "
1000 "flag %d tid %llx pktlen %d datalen %d> ",
1001 channel, channel->OfferMsg.ChildRelId, desc.Type,
1002 desc.Flags, desc.TransactionId, packetlen, userlen);
1003
1004 *buffer_actual_len = packetlen;
1005
1006 if (packetlen > bufferlen) {
1007 spin_unlock_irqrestore(&channel->inbound_lock, flags);
1008
1009 DPRINT_ERR(VMBUS, "buffer too small - needed %d bytes but "
1010 "got space for only %d bytes", packetlen, bufferlen);
1011 return -2;
1012 }
1013
1014 *requestid = desc.TransactionId;
1015
1016 /* Copy over the entire packet to the user buffer */
1017 ret = RingBufferRead(&channel->Inbound, buffer, packetlen, 0);
1018
1019 spin_unlock_irqrestore(&channel->inbound_lock, flags);
1020 return 0;
1021}
1022EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);
1023
1024/*
1025 * vmbus_onchannel_event - Channel event callback
1026 */
1027void vmbus_onchannel_event(struct vmbus_channel *channel)
1028{
1029 dump_vmbus_channel(channel);
1030 /* ASSERT(Channel->OnChannelCallback); */
1031
1032 channel->OnChannelCallback(channel->ChannelCallbackContext);
1033
1034 mod_timer(&channel->poll_timer, jiffies + usecs_to_jiffies(100));
1035}
1036
1037/*
1038 * vmbus_ontimer - Timer event callback
1039 */
1040void vmbus_ontimer(unsigned long data)
1041{
1042 struct vmbus_channel *channel = (struct vmbus_channel *)data;
1043
1044 if (channel->OnChannelCallback)
1045 channel->OnChannelCallback(channel->ChannelCallbackContext);
1046}
1047
1048/*
1049 * dump_vmbus_channel- Dump vmbus channel info to the console
1050 */
1051static void dump_vmbus_channel(struct vmbus_channel *channel)
1052{
1053 DPRINT_DBG(VMBUS, "Channel (%d)", channel->OfferMsg.ChildRelId);
1054 DumpRingInfo(&channel->Outbound, "Outbound ");
1055 DumpRingInfo(&channel->Inbound, "Inbound ");
1056}
Linux kernel - Deliverables
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