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/module.h>
27 #include "vmbus_private.h"
29 /* Internal routines */
30 static 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
,
35 static void dump_vmbus_channel(struct vmbus_channel
*channel
);
36 static void vmbus_setevent(struct vmbus_channel
*channel
);
40 static void DumpMonitorPage(struct hv_monitor_page
*MonitorPage
)
45 DPRINT_DBG(VMBUS
, "monitorPage - %p, trigger state - %d",
46 MonitorPage
, MonitorPage
->TriggerState
);
48 for (i
= 0; i
< 4; i
++)
49 DPRINT_DBG(VMBUS
, "trigger group (%d) - %llx", i
,
50 MonitorPage
->TriggerGroup
[i
].AsUINT64
);
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
]);
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
);
70 * vmbus_setevent- Trigger an event notification on the specified
73 static void vmbus_setevent(struct vmbus_channel
*channel
)
75 struct hv_monitor_page
*monitorpage
;
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));
83 monitorpage
= gVmbusConnection
.MonitorPages
;
84 monitorpage
++; /* Get the child to parent monitor page */
86 set_bit(channel
->MonitorBit
,
87 (unsigned long *)&monitorpage
->TriggerGroup
88 [channel
->MonitorGroup
].Pending
);
91 VmbusSetEvent(channel
->OfferMsg
.ChildRelId
);
96 static void VmbusChannelClearEvent(struct vmbus_channel
*channel
)
98 struct hv_monitor_page
*monitorPage
;
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));
107 (struct hv_monitor_page
*)gVmbusConnection
.MonitorPages
;
108 monitorPage
++; /* Get the child to parent monitor page */
110 clear_bit(Channel
->MonitorBit
,
111 (unsigned long *)&monitorPage
->TriggerGroup
112 [Channel
->MonitorGroup
].Pending
);
118 * vmbus_get_debug_info -Retrieve various channel debug info
120 void vmbus_get_debug_info(struct vmbus_channel
*channel
,
121 struct vmbus_channel_debug_info
*debuginfo
)
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; */
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
));
136 monitorpage
= (struct hv_monitor_page
*)gVmbusConnection
.MonitorPages
;
138 debuginfo
->MonitorId
= channel
->OfferMsg
.MonitorId
;
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
;
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
;
158 RingBufferGetDebugInfo(&channel
->Inbound
, &debuginfo
->Inbound
);
159 RingBufferGetDebugInfo(&channel
->Outbound
, &debuginfo
->Outbound
);
163 * vmbus_open - Open the specified channel.
165 int 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
)
169 struct vmbus_channel_open_channel
*openMsg
;
170 struct vmbus_channel_msginfo
*openInfo
= NULL
;
175 /* Aligned to page size */
176 /* ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1))); */
177 /* ASSERT(!(RecvRingBufferSize & (PAGE_SIZE - 1))); */
179 newchannel
->OnChannelCallback
= onchannelcallback
;
180 newchannel
->ChannelCallbackContext
= context
;
182 /* Allocate the ring buffer */
183 out
= osd_PageAlloc((send_ringbuffer_size
+ recv_ringbuffer_size
)
188 /* ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0); */
190 in
= (void *)((unsigned long)out
+ send_ringbuffer_size
);
192 newchannel
->RingBufferPages
= out
;
193 newchannel
->RingBufferPageCount
= (send_ringbuffer_size
+
194 recv_ringbuffer_size
) >> PAGE_SHIFT
;
196 ret
= RingBufferInit(&newchannel
->Outbound
, out
, send_ringbuffer_size
);
202 ret
= RingBufferInit(&newchannel
->Inbound
, in
, recv_ringbuffer_size
);
209 /* Establish the gpadl for the ring buffer */
210 DPRINT_DBG(VMBUS
, "Establishing ring buffer's gpadl for channel %p...",
213 newchannel
->RingBufferGpadlHandle
= 0;
215 ret
= vmbus_establish_gpadl(newchannel
,
216 newchannel
->Outbound
.RingBuffer
,
217 send_ringbuffer_size
+
218 recv_ringbuffer_size
,
219 &newchannel
->RingBufferGpadlHandle
);
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
);
236 /* Create and init the channel open message */
237 openInfo
= kmalloc(sizeof(*openInfo
) +
238 sizeof(struct vmbus_channel_open_channel
),
245 openInfo
->WaitEvent
= osd_WaitEventCreate();
246 if (!openInfo
->WaitEvent
) {
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
>>
258 openMsg
->ServerContextAreaGpadlHandle
= 0; /* TODO */
260 if (userdatalen
> MAX_USER_DEFINED_BYTES
) {
266 memcpy(openMsg
->UserData
, userdata
, userdatalen
);
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
);
273 DPRINT_DBG(VMBUS
, "Sending channel open msg...");
275 ret
= VmbusPostMessage(openMsg
,
276 sizeof(struct vmbus_channel_open_channel
));
278 DPRINT_ERR(VMBUS
, "unable to open channel - %d", ret
);
282 /* FIXME: Need to time-out here */
283 osd_WaitEventWait(openInfo
->WaitEvent
);
285 if (openInfo
->Response
.OpenResult
.Status
== 0)
286 DPRINT_INFO(VMBUS
, "channel <%p> open success!!", newchannel
);
288 DPRINT_INFO(VMBUS
, "channel <%p> open failed - %d!!",
289 newchannel
, openInfo
->Response
.OpenResult
.Status
);
292 spin_lock_irqsave(&gVmbusConnection
.channelmsg_lock
, flags
);
293 list_del(&openInfo
->MsgListEntry
);
294 spin_unlock_irqrestore(&gVmbusConnection
.channelmsg_lock
, flags
);
296 kfree(openInfo
->WaitEvent
);
301 RingBufferCleanup(&newchannel
->Outbound
);
302 RingBufferCleanup(&newchannel
->Inbound
);
303 osd_PageFree(out
, (send_ringbuffer_size
+ recv_ringbuffer_size
)
310 * dump_gpadl_body - Dump the gpadl body message to the console for
311 * debugging purposes.
313 static void dump_gpadl_body(struct vmbus_channel_gpadl_body
*gpadl
, u32 len
)
318 pfncount
= (len
- sizeof(struct vmbus_channel_gpadl_body
)) /
320 DPRINT_DBG(VMBUS
, "gpadl body - len %d pfn count %d", len
, pfncount
);
322 for (i
= 0; i
< pfncount
; i
++)
323 DPRINT_DBG(VMBUS
, "gpadl body - %d) pfn %llu",
328 * dump_gpadl_header - Dump the gpadl header message to the console for
329 * debugging purposes.
331 static void dump_gpadl_header(struct vmbus_channel_gpadl_header
*gpadl
)
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
;
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
);
347 for (j
= 0; j
< pagecount
; j
++)
348 DPRINT_DBG(VMBUS
, "%d) pfn %llu", j
,
349 gpadl
->Range
[i
].PfnArray
[j
]);
354 * create_gpadl_header - Creates a gpadl for the specified buffer
356 static int create_gpadl_header(void *kbuffer
, u32 size
,
357 struct vmbus_channel_msginfo
**msginfo
,
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
;
369 int pfnsum
, pfncount
, pfnleft
, pfncurr
, pfnsize
;
371 /* ASSERT((kbuffer & (PAGE_SIZE-1)) == 0); */
372 /* ASSERT((Size & (PAGE_SIZE-1)) == 0); */
374 pagecount
= size
>> PAGE_SHIFT
;
375 pfn
= virt_to_phys(kbuffer
) >> PAGE_SHIFT
;
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
);
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
);
393 INIT_LIST_HEAD(&msgheader
->SubMsgList
);
394 msgheader
->MessageSize
= msgsize
;
396 gpadl_header
= (struct vmbus_channel_gpadl_header
*)
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
;
409 pfnleft
= pagecount
- pfncount
;
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
);
416 /* fill in the body */
418 if (pfnleft
> pfncount
)
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 */
430 msgbody
->MessageSize
= msgsize
;
433 (struct vmbus_channel_gpadl_body
*)msgbody
->Msg
;
437 * Gpadl is u32 and we are using a pointer which could
440 /* gpadl_body->Gpadl = kbuffer; */
441 for (i
= 0; i
< pfncurr
; i
++)
442 gpadl_body
->Pfn
[i
] = pfn
+ pfnsum
+ i
;
444 /* add to msg header */
445 list_add_tail(&msgbody
->MsgListEntry
,
446 &msgheader
->SubMsgList
);
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
)
458 msgheader
->MessageSize
= msgsize
;
460 gpadl_header
= (struct vmbus_channel_gpadl_header
*)
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
;
470 *msginfo
= msgheader
;
482 * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer
484 * @channel: a channel
485 * @kbuffer: from kmalloc
486 * @size: page-size multiple
487 * @gpadl_handle: some funky thing
489 int vmbus_establish_gpadl(struct vmbus_channel
*channel
, void *kbuffer
,
490 u32 size
, u32
*gpadl_handle
)
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
;
498 struct list_head
*curr
;
499 u32 next_gpadl_handle
;
503 next_gpadl_handle
= atomic_read(&gVmbusConnection
.NextGpadlHandle
);
504 atomic_inc(&gVmbusConnection
.NextGpadlHandle
);
506 ret
= create_gpadl_header(kbuffer
, size
, &msginfo
, &msgcount
);
510 msginfo
->WaitEvent
= osd_WaitEventCreate();
511 if (!msginfo
->WaitEvent
) {
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
;
521 dump_gpadl_header(gpadlmsg
);
523 spin_lock_irqsave(&gVmbusConnection
.channelmsg_lock
, flags
);
524 list_add_tail(&msginfo
->MsgListEntry
,
525 &gVmbusConnection
.ChannelMsgList
);
527 spin_unlock_irqrestore(&gVmbusConnection
.channelmsg_lock
, flags
);
528 DPRINT_DBG(VMBUS
, "buffer %p, size %d msg cnt %d",
529 kbuffer
, size
, msgcount
);
531 DPRINT_DBG(VMBUS
, "Sending GPADL Header - len %zd",
532 msginfo
->MessageSize
- sizeof(*msginfo
));
534 ret
= VmbusPostMessage(gpadlmsg
, msginfo
->MessageSize
-
537 DPRINT_ERR(VMBUS
, "Unable to open channel - %d", ret
);
542 list_for_each(curr
, &msginfo
->SubMsgList
) {
544 /* FIXME: should this use list_entry() instead ? */
545 submsginfo
= (struct vmbus_channel_msginfo
*)curr
;
547 (struct vmbus_channel_gpadl_body
*)submsginfo
->Msg
;
549 gpadl_body
->Header
.MessageType
=
550 ChannelMessageGpadlBody
;
551 gpadl_body
->Gpadl
= next_gpadl_handle
;
553 DPRINT_DBG(VMBUS
, "Sending GPADL Body - len %zd",
554 submsginfo
->MessageSize
-
555 sizeof(*submsginfo
));
557 dump_gpadl_body(gpadl_body
, submsginfo
->MessageSize
-
558 sizeof(*submsginfo
));
559 ret
= VmbusPostMessage(gpadl_body
,
560 submsginfo
->MessageSize
-
561 sizeof(*submsginfo
));
567 osd_WaitEventWait(msginfo
->WaitEvent
);
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
,
576 *gpadl_handle
= gpadlmsg
->Gpadl
;
579 spin_lock_irqsave(&gVmbusConnection
.channelmsg_lock
, flags
);
580 list_del(&msginfo
->MsgListEntry
);
581 spin_unlock_irqrestore(&gVmbusConnection
.channelmsg_lock
, flags
);
583 kfree(msginfo
->WaitEvent
);
589 * vmbus_teardown_gpadl -Teardown the specified GPADL handle
591 int vmbus_teardown_gpadl(struct vmbus_channel
*channel
, u32 gpadl_handle
)
593 struct vmbus_channel_gpadl_teardown
*msg
;
594 struct vmbus_channel_msginfo
*info
;
598 /* ASSERT(gpadl_handle != 0); */
600 info
= kmalloc(sizeof(*info
) +
601 sizeof(struct vmbus_channel_gpadl_teardown
), GFP_KERNEL
);
605 info
->WaitEvent
= osd_WaitEventCreate();
606 if (!info
->WaitEvent
) {
611 msg
= (struct vmbus_channel_gpadl_teardown
*)info
->Msg
;
613 msg
->Header
.MessageType
= ChannelMessageGpadlTeardown
;
614 msg
->ChildRelId
= channel
->OfferMsg
.ChildRelId
;
615 msg
->Gpadl
= gpadl_handle
;
617 spin_lock_irqsave(&gVmbusConnection
.channelmsg_lock
, flags
);
618 list_add_tail(&info
->MsgListEntry
,
619 &gVmbusConnection
.ChannelMsgList
);
620 spin_unlock_irqrestore(&gVmbusConnection
.channelmsg_lock
, flags
);
622 ret
= VmbusPostMessage(msg
,
623 sizeof(struct vmbus_channel_gpadl_teardown
));
629 osd_WaitEventWait(info
->WaitEvent
);
631 /* Received a torndown response */
632 spin_lock_irqsave(&gVmbusConnection
.channelmsg_lock
, flags
);
633 list_del(&info
->MsgListEntry
);
634 spin_unlock_irqrestore(&gVmbusConnection
.channelmsg_lock
, flags
);
636 kfree(info
->WaitEvent
);
642 * vmbus_close - Close the specified channel
644 void vmbus_close(struct vmbus_channel
*channel
)
646 struct vmbus_channel_close_channel
*msg
;
647 struct vmbus_channel_msginfo
*info
;
651 /* Stop callback and cancel the timer asap */
652 channel
->OnChannelCallback
= NULL
;
653 del_timer_sync(&channel
->poll_timer
);
655 /* Send a closing message */
656 info
= kmalloc(sizeof(*info
) +
657 sizeof(struct vmbus_channel_close_channel
), GFP_KERNEL
);
658 /* FIXME: can't do anything other than return here because the
659 * function is void */
663 /* info->waitEvent = osd_WaitEventCreate(); */
665 msg
= (struct vmbus_channel_close_channel
*)info
->Msg
;
666 msg
->Header
.MessageType
= ChannelMessageCloseChannel
;
667 msg
->ChildRelId
= channel
->OfferMsg
.ChildRelId
;
669 ret
= VmbusPostMessage(msg
, sizeof(struct vmbus_channel_close_channel
));
675 /* Tear down the gpadl for the channel's ring buffer */
676 if (channel
->RingBufferGpadlHandle
)
677 vmbus_teardown_gpadl(channel
,
678 channel
->RingBufferGpadlHandle
);
680 /* TODO: Send a msg to release the childRelId */
682 /* Cleanup the ring buffers for this channel */
683 RingBufferCleanup(&channel
->Outbound
);
684 RingBufferCleanup(&channel
->Inbound
);
686 osd_PageFree(channel
->RingBufferPages
, channel
->RingBufferPageCount
);
691 * If we are closing the channel during an error path in
692 * opening the channel, don't free the channel since the
693 * caller will free the channel
696 if (channel
->State
== CHANNEL_OPEN_STATE
) {
697 spin_lock_irqsave(&gVmbusConnection
.channel_lock
, flags
);
698 list_del(&channel
->ListEntry
);
699 spin_unlock_irqrestore(&gVmbusConnection
.channel_lock
, flags
);
701 FreeVmbusChannel(channel
);
706 * vmbus_sendpacket() - Send the specified buffer on the given channel
707 * @channel: Pointer to vmbus_channel structure.
708 * @buffer: Pointer to the buffer you want to receive the data into.
709 * @bufferlen: Maximum size of what the the buffer will hold
710 * @requestid: Identifier of the request
711 * @type: Type of packet that is being send e.g. negotiate, time
714 * Sends data in @buffer directly to hyper-v via the vmbus
715 * This will send the data unparsed to hyper-v.
717 * Mainly used by Hyper-V drivers.
719 int vmbus_sendpacket(struct vmbus_channel
*channel
, const void *buffer
,
720 u32 bufferlen
, u64 requestid
,
721 enum vmbus_packet_type type
, u32 flags
)
723 struct vmpacket_descriptor desc
;
724 u32 packetlen
= sizeof(struct vmpacket_descriptor
) + bufferlen
;
725 u32 packetlen_aligned
= ALIGN_UP(packetlen
, sizeof(u64
));
726 struct scatterlist bufferlist
[3];
727 u64 aligned_data
= 0;
730 DPRINT_DBG(VMBUS
, "channel %p buffer %p len %d",
731 channel
, buffer
, bufferlen
);
733 dump_vmbus_channel(channel
);
735 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
737 /* Setup the descriptor */
738 desc
.Type
= type
; /* VmbusPacketTypeDataInBand; */
739 desc
.Flags
= flags
; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
740 /* in 8-bytes granularity */
741 desc
.DataOffset8
= sizeof(struct vmpacket_descriptor
) >> 3;
742 desc
.Length8
= (u16
)(packetlen_aligned
>> 3);
743 desc
.TransactionId
= requestid
;
745 sg_init_table(bufferlist
, 3);
746 sg_set_buf(&bufferlist
[0], &desc
, sizeof(struct vmpacket_descriptor
));
747 sg_set_buf(&bufferlist
[1], buffer
, bufferlen
);
748 sg_set_buf(&bufferlist
[2], &aligned_data
,
749 packetlen_aligned
- packetlen
);
751 ret
= RingBufferWrite(&channel
->Outbound
, bufferlist
, 3);
753 /* TODO: We should determine if this is optional */
754 if (ret
== 0 && !GetRingBufferInterruptMask(&channel
->Outbound
))
755 vmbus_setevent(channel
);
759 EXPORT_SYMBOL(vmbus_sendpacket
);
762 * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
763 * packets using a GPADL Direct packet type.
765 int vmbus_sendpacket_pagebuffer(struct vmbus_channel
*channel
,
766 struct hv_page_buffer pagebuffers
[],
767 u32 pagecount
, void *buffer
, u32 bufferlen
,
772 struct vmbus_channel_packet_page_buffer desc
;
775 u32 packetlen_aligned
;
776 struct scatterlist bufferlist
[3];
777 u64 aligned_data
= 0;
779 if (pagecount
> MAX_PAGE_BUFFER_COUNT
)
782 dump_vmbus_channel(channel
);
785 * Adjust the size down since vmbus_channel_packet_page_buffer is the
786 * largest size we support
788 descsize
= sizeof(struct vmbus_channel_packet_page_buffer
) -
789 ((MAX_PAGE_BUFFER_COUNT
- pagecount
) *
790 sizeof(struct hv_page_buffer
));
791 packetlen
= descsize
+ bufferlen
;
792 packetlen_aligned
= ALIGN_UP(packetlen
, sizeof(u64
));
794 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
796 /* Setup the descriptor */
797 desc
.type
= VmbusPacketTypeDataUsingGpaDirect
;
798 desc
.flags
= VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
;
799 desc
.dataoffset8
= descsize
>> 3; /* in 8-bytes grandularity */
800 desc
.length8
= (u16
)(packetlen_aligned
>> 3);
801 desc
.transactionid
= requestid
;
802 desc
.rangecount
= pagecount
;
804 for (i
= 0; i
< pagecount
; i
++) {
805 desc
.range
[i
].Length
= pagebuffers
[i
].Length
;
806 desc
.range
[i
].Offset
= pagebuffers
[i
].Offset
;
807 desc
.range
[i
].Pfn
= pagebuffers
[i
].Pfn
;
810 sg_init_table(bufferlist
, 3);
811 sg_set_buf(&bufferlist
[0], &desc
, descsize
);
812 sg_set_buf(&bufferlist
[1], buffer
, bufferlen
);
813 sg_set_buf(&bufferlist
[2], &aligned_data
,
814 packetlen_aligned
- packetlen
);
816 ret
= RingBufferWrite(&channel
->Outbound
, bufferlist
, 3);
818 /* TODO: We should determine if this is optional */
819 if (ret
== 0 && !GetRingBufferInterruptMask(&channel
->Outbound
))
820 vmbus_setevent(channel
);
826 * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
827 * using a GPADL Direct packet type.
829 int vmbus_sendpacket_multipagebuffer(struct vmbus_channel
*channel
,
830 struct hv_multipage_buffer
*multi_pagebuffer
,
831 void *buffer
, u32 bufferlen
, u64 requestid
)
834 struct vmbus_channel_packet_multipage_buffer desc
;
837 u32 packetlen_aligned
;
838 struct scatterlist bufferlist
[3];
839 u64 aligned_data
= 0;
840 u32 pfncount
= NUM_PAGES_SPANNED(multi_pagebuffer
->Offset
,
841 multi_pagebuffer
->Length
);
843 dump_vmbus_channel(channel
);
845 DPRINT_DBG(VMBUS
, "data buffer - offset %u len %u pfn count %u",
846 multi_pagebuffer
->Offset
,
847 multi_pagebuffer
->Length
, pfncount
);
849 if ((pfncount
< 0) || (pfncount
> MAX_MULTIPAGE_BUFFER_COUNT
))
853 * Adjust the size down since vmbus_channel_packet_multipage_buffer is
854 * the largest size we support
856 descsize
= sizeof(struct vmbus_channel_packet_multipage_buffer
) -
857 ((MAX_MULTIPAGE_BUFFER_COUNT
- pfncount
) *
859 packetlen
= descsize
+ bufferlen
;
860 packetlen_aligned
= ALIGN_UP(packetlen
, sizeof(u64
));
862 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
864 /* Setup the descriptor */
865 desc
.type
= VmbusPacketTypeDataUsingGpaDirect
;
866 desc
.flags
= VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
;
867 desc
.dataoffset8
= descsize
>> 3; /* in 8-bytes grandularity */
868 desc
.length8
= (u16
)(packetlen_aligned
>> 3);
869 desc
.transactionid
= requestid
;
872 desc
.range
.Length
= multi_pagebuffer
->Length
;
873 desc
.range
.Offset
= multi_pagebuffer
->Offset
;
875 memcpy(desc
.range
.PfnArray
, multi_pagebuffer
->PfnArray
,
876 pfncount
* sizeof(u64
));
878 sg_init_table(bufferlist
, 3);
879 sg_set_buf(&bufferlist
[0], &desc
, descsize
);
880 sg_set_buf(&bufferlist
[1], buffer
, bufferlen
);
881 sg_set_buf(&bufferlist
[2], &aligned_data
,
882 packetlen_aligned
- packetlen
);
884 ret
= RingBufferWrite(&channel
->Outbound
, bufferlist
, 3);
886 /* TODO: We should determine if this is optional */
887 if (ret
== 0 && !GetRingBufferInterruptMask(&channel
->Outbound
))
888 vmbus_setevent(channel
);
895 * vmbus_recvpacket() - Retrieve the user packet on the specified channel
896 * @channel: Pointer to vmbus_channel structure.
897 * @buffer: Pointer to the buffer you want to receive the data into.
898 * @bufferlen: Maximum size of what the the buffer will hold
899 * @buffer_actual_len: The actual size of the data after it was received
900 * @requestid: Identifier of the request
902 * Receives directly from the hyper-v vmbus and puts the data it received
903 * into Buffer. This will receive the data unparsed from hyper-v.
905 * Mainly used by Hyper-V drivers.
907 int vmbus_recvpacket(struct vmbus_channel
*channel
, void *buffer
,
908 u32 bufferlen
, u32
*buffer_actual_len
, u64
*requestid
)
910 struct vmpacket_descriptor desc
;
916 *buffer_actual_len
= 0;
919 spin_lock_irqsave(&channel
->inbound_lock
, flags
);
921 ret
= RingBufferPeek(&channel
->Inbound
, &desc
,
922 sizeof(struct vmpacket_descriptor
));
924 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
926 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
930 /* VmbusChannelClearEvent(Channel); */
932 packetlen
= desc
.Length8
<< 3;
933 userlen
= packetlen
- (desc
.DataOffset8
<< 3);
934 /* ASSERT(userLen > 0); */
936 DPRINT_DBG(VMBUS
, "packet received on channel %p relid %d <type %d "
937 "flag %d tid %llx pktlen %d datalen %d> ",
938 channel
, channel
->OfferMsg
.ChildRelId
, desc
.Type
,
939 desc
.Flags
, desc
.TransactionId
, packetlen
, userlen
);
941 *buffer_actual_len
= userlen
;
943 if (userlen
> bufferlen
) {
944 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
946 DPRINT_ERR(VMBUS
, "buffer too small - got %d needs %d",
951 *requestid
= desc
.TransactionId
;
953 /* Copy over the packet to the user buffer */
954 ret
= RingBufferRead(&channel
->Inbound
, buffer
, userlen
,
955 (desc
.DataOffset8
<< 3));
957 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
961 EXPORT_SYMBOL(vmbus_recvpacket
);
964 * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel
966 int vmbus_recvpacket_raw(struct vmbus_channel
*channel
, void *buffer
,
967 u32 bufferlen
, u32
*buffer_actual_len
,
970 struct vmpacket_descriptor desc
;
976 *buffer_actual_len
= 0;
979 spin_lock_irqsave(&channel
->inbound_lock
, flags
);
981 ret
= RingBufferPeek(&channel
->Inbound
, &desc
,
982 sizeof(struct vmpacket_descriptor
));
984 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
986 /* DPRINT_DBG(VMBUS, "nothing to read!!"); */
990 /* VmbusChannelClearEvent(Channel); */
992 packetlen
= desc
.Length8
<< 3;
993 userlen
= packetlen
- (desc
.DataOffset8
<< 3);
995 DPRINT_DBG(VMBUS
, "packet received on channel %p relid %d <type %d "
996 "flag %d tid %llx pktlen %d datalen %d> ",
997 channel
, channel
->OfferMsg
.ChildRelId
, desc
.Type
,
998 desc
.Flags
, desc
.TransactionId
, packetlen
, userlen
);
1000 *buffer_actual_len
= packetlen
;
1002 if (packetlen
> bufferlen
) {
1003 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
1005 DPRINT_ERR(VMBUS
, "buffer too small - needed %d bytes but "
1006 "got space for only %d bytes", packetlen
, bufferlen
);
1010 *requestid
= desc
.TransactionId
;
1012 /* Copy over the entire packet to the user buffer */
1013 ret
= RingBufferRead(&channel
->Inbound
, buffer
, packetlen
, 0);
1015 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
1020 * vmbus_onchannel_event - Channel event callback
1022 void vmbus_onchannel_event(struct vmbus_channel
*channel
)
1024 dump_vmbus_channel(channel
);
1025 /* ASSERT(Channel->OnChannelCallback); */
1027 channel
->OnChannelCallback(channel
->ChannelCallbackContext
);
1029 mod_timer(&channel
->poll_timer
, jiffies
+ usecs_to_jiffies(100));
1033 * vmbus_ontimer - Timer event callback
1035 void vmbus_ontimer(unsigned long data
)
1037 struct vmbus_channel
*channel
= (struct vmbus_channel
*)data
;
1039 if (channel
->OnChannelCallback
)
1040 channel
->OnChannelCallback(channel
->ChannelCallbackContext
);
1044 * dump_vmbus_channel- Dump vmbus channel info to the console
1046 static void dump_vmbus_channel(struct vmbus_channel
*channel
)
1048 DPRINT_DBG(VMBUS
, "Channel (%d)", channel
->OfferMsg
.ChildRelId
);
1049 DumpRingInfo(&channel
->Outbound
, "Outbound ");
1050 DumpRingInfo(&channel
->Inbound
, "Inbound ");