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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
23 #include <linux/kernel.h>
24 #include <linux/sched.h>
25 #include <linux/wait.h>
27 #include <linux/slab.h>
28 #include <linux/module.h>
31 #include "vmbus_private.h"
33 #define NUM_PAGES_SPANNED(addr, len) \
34 ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT))
36 /* Internal routines */
37 static int create_gpadl_header(
38 void *kbuffer
, /* must be phys and virt contiguous */
39 u32 size
, /* page-size multiple */
40 struct vmbus_channel_msginfo
**msginfo
,
42 static void dump_vmbus_channel(struct vmbus_channel
*channel
);
43 static void vmbus_setevent(struct vmbus_channel
*channel
);
47 static void DumpMonitorPage(struct hv_monitor_page
*MonitorPage
)
52 DPRINT_DBG(VMBUS
, "monitorPage - %p, trigger state - %d",
53 MonitorPage
, MonitorPage
->trigger_state
);
55 for (i
= 0; i
< 4; i
++)
56 DPRINT_DBG(VMBUS
, "trigger group (%d) - %llx", i
,
57 MonitorPage
->trigger_group
[i
].as_uint64
);
59 for (i
= 0; i
< 4; i
++) {
60 for (j
= 0; j
< 32; j
++) {
61 DPRINT_DBG(VMBUS
, "latency (%d)(%d) - %llx", i
, j
,
62 MonitorPage
->latency
[i
][j
]);
65 for (i
= 0; i
< 4; i
++) {
66 for (j
= 0; j
< 32; j
++) {
67 DPRINT_DBG(VMBUS
, "param-conn id (%d)(%d) - %d", i
, j
,
68 MonitorPage
->parameter
[i
][j
].connectionid
.asu32
);
69 DPRINT_DBG(VMBUS
, "param-flag (%d)(%d) - %d", i
, j
,
70 MonitorPage
->parameter
[i
][j
].flag_number
);
77 * vmbus_setevent- Trigger an event notification on the specified
80 static void vmbus_setevent(struct vmbus_channel
*channel
)
82 struct hv_monitor_page
*monitorpage
;
84 if (channel
->offermsg
.monitor_allocated
) {
85 /* Each u32 represents 32 channels */
86 sync_set_bit(channel
->offermsg
.child_relid
& 31,
87 (unsigned long *) vmbus_connection
.send_int_page
+
88 (channel
->offermsg
.child_relid
>> 5));
90 monitorpage
= vmbus_connection
.monitor_pages
;
91 monitorpage
++; /* Get the child to parent monitor page */
93 sync_set_bit(channel
->monitor_bit
,
94 (unsigned long *)&monitorpage
->trigger_group
95 [channel
->monitor_grp
].pending
);
98 vmbus_set_event(channel
->offermsg
.child_relid
);
103 static void VmbusChannelClearEvent(struct vmbus_channel
*channel
)
105 struct hv_monitor_page
*monitorPage
;
107 if (Channel
->offermsg
.monitor_allocated
) {
108 /* Each u32 represents 32 channels */
109 sync_clear_bit(Channel
->offermsg
.child_relid
& 31,
110 (unsigned long *)vmbus_connection
.send_int_page
+
111 (Channel
->offermsg
.child_relid
>> 5));
113 monitorPage
= (struct hv_monitor_page
*)
114 vmbus_connection
.monitor_pages
;
115 monitorPage
++; /* Get the child to parent monitor page */
117 sync_clear_bit(Channel
->monitor_bit
,
118 (unsigned long *)&monitorPage
->trigger_group
119 [Channel
->monitor_grp
].Pending
);
125 * vmbus_get_debug_info -Retrieve various channel debug info
127 void vmbus_get_debug_info(struct vmbus_channel
*channel
,
128 struct vmbus_channel_debug_info
*debuginfo
)
130 struct hv_monitor_page
*monitorpage
;
131 u8 monitor_group
= (u8
)channel
->offermsg
.monitorid
/ 32;
132 u8 monitor_offset
= (u8
)channel
->offermsg
.monitorid
% 32;
133 /* u32 monitorBit = 1 << monitorOffset; */
135 debuginfo
->relid
= channel
->offermsg
.child_relid
;
136 debuginfo
->state
= channel
->state
;
137 memcpy(&debuginfo
->interfacetype
,
138 &channel
->offermsg
.offer
.if_type
, sizeof(struct hv_guid
));
139 memcpy(&debuginfo
->interface_instance
,
140 &channel
->offermsg
.offer
.if_instance
,
141 sizeof(struct hv_guid
));
143 monitorpage
= (struct hv_monitor_page
*)vmbus_connection
.monitor_pages
;
145 debuginfo
->monitorid
= channel
->offermsg
.monitorid
;
147 debuginfo
->servermonitor_pending
=
148 monitorpage
->trigger_group
[monitor_group
].pending
;
149 debuginfo
->servermonitor_latency
=
150 monitorpage
->latency
[monitor_group
][monitor_offset
];
151 debuginfo
->servermonitor_connectionid
=
152 monitorpage
->parameter
[monitor_group
]
153 [monitor_offset
].connectionid
.u
.id
;
157 debuginfo
->clientmonitor_pending
=
158 monitorpage
->trigger_group
[monitor_group
].pending
;
159 debuginfo
->clientmonitor_latency
=
160 monitorpage
->latency
[monitor_group
][monitor_offset
];
161 debuginfo
->clientmonitor_connectionid
=
162 monitorpage
->parameter
[monitor_group
]
163 [monitor_offset
].connectionid
.u
.id
;
165 ringbuffer_get_debuginfo(&channel
->inbound
, &debuginfo
->inbound
);
166 ringbuffer_get_debuginfo(&channel
->outbound
, &debuginfo
->outbound
);
170 * vmbus_open - Open the specified channel.
172 int vmbus_open(struct vmbus_channel
*newchannel
, u32 send_ringbuffer_size
,
173 u32 recv_ringbuffer_size
, void *userdata
, u32 userdatalen
,
174 void (*onchannelcallback
)(void *context
), void *context
)
176 struct vmbus_channel_open_channel
*openMsg
;
177 struct vmbus_channel_msginfo
*openInfo
= NULL
;
182 /* Aligned to page size */
183 /* ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1))); */
184 /* ASSERT(!(RecvRingBufferSize & (PAGE_SIZE - 1))); */
186 newchannel
->onchannel_callback
= onchannelcallback
;
187 newchannel
->channel_callback_context
= context
;
189 /* Allocate the ring buffer */
190 out
= (void *)__get_free_pages(GFP_KERNEL
|__GFP_ZERO
,
191 get_order(send_ringbuffer_size
+ recv_ringbuffer_size
));
196 /* ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0); */
198 in
= (void *)((unsigned long)out
+ send_ringbuffer_size
);
200 newchannel
->ringbuffer_pages
= out
;
201 newchannel
->ringbuffer_pagecount
= (send_ringbuffer_size
+
202 recv_ringbuffer_size
) >> PAGE_SHIFT
;
204 ret
= hv_ringbuffer_init(
205 &newchannel
->outbound
, out
, send_ringbuffer_size
);
212 ret
= hv_ringbuffer_init(
213 &newchannel
->inbound
, in
, recv_ringbuffer_size
);
220 /* Establish the gpadl for the ring buffer */
221 newchannel
->ringbuffer_gpadlhandle
= 0;
223 ret
= vmbus_establish_gpadl(newchannel
,
224 newchannel
->outbound
.ring_buffer
,
225 send_ringbuffer_size
+
226 recv_ringbuffer_size
,
227 &newchannel
->ringbuffer_gpadlhandle
);
234 /* Create and init the channel open message */
235 openInfo
= kmalloc(sizeof(*openInfo
) +
236 sizeof(struct vmbus_channel_open_channel
),
243 init_waitqueue_head(&openInfo
->waitevent
);
245 openMsg
= (struct vmbus_channel_open_channel
*)openInfo
->msg
;
246 openMsg
->header
.msgtype
= CHANNELMSG_OPENCHANNEL
;
247 openMsg
->openid
= newchannel
->offermsg
.child_relid
; /* FIXME */
248 openMsg
->child_relid
= newchannel
->offermsg
.child_relid
;
249 openMsg
->ringbuffer_gpadlhandle
= newchannel
->ringbuffer_gpadlhandle
;
250 openMsg
->downstream_ringbuffer_pageoffset
= send_ringbuffer_size
>>
252 openMsg
->server_contextarea_gpadlhandle
= 0; /* TODO */
254 if (userdatalen
> MAX_USER_DEFINED_BYTES
) {
260 memcpy(openMsg
->userdata
, userdata
, userdatalen
);
262 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
263 list_add_tail(&openInfo
->msglistentry
,
264 &vmbus_connection
.chn_msg_list
);
265 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
267 ret
= vmbus_post_msg(openMsg
,
268 sizeof(struct vmbus_channel_open_channel
));
273 openInfo
->wait_condition
= 0;
274 wait_event_timeout(openInfo
->waitevent
,
275 openInfo
->wait_condition
,
276 msecs_to_jiffies(1000));
277 if (openInfo
->wait_condition
== 0) {
283 if (openInfo
->response
.open_result
.status
)
284 err
= openInfo
->response
.open_result
.status
;
287 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
288 list_del(&openInfo
->msglistentry
);
289 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
295 hv_ringbuffer_cleanup(&newchannel
->outbound
);
296 hv_ringbuffer_cleanup(&newchannel
->inbound
);
297 free_pages((unsigned long)out
,
298 get_order(send_ringbuffer_size
+ recv_ringbuffer_size
));
302 EXPORT_SYMBOL_GPL(vmbus_open
);
305 * dump_gpadl_body - Dump the gpadl body message to the console for
306 * debugging purposes.
308 static void dump_gpadl_body(struct vmbus_channel_gpadl_body
*gpadl
, u32 len
)
313 pfncount
= (len
- sizeof(struct vmbus_channel_gpadl_body
)) /
316 DPRINT_DBG(VMBUS
, "gpadl body - len %d pfn count %d", len
, pfncount
);
318 for (i
= 0; i
< pfncount
; i
++)
319 DPRINT_DBG(VMBUS
, "gpadl body - %d) pfn %llu",
324 * dump_gpadl_header - Dump the gpadl header message to the console for
325 * debugging purposes.
327 static void dump_gpadl_header(struct vmbus_channel_gpadl_header
*gpadl
)
333 "gpadl header - relid %d, range count %d, range buflen %d",
334 gpadl
->child_relid
, gpadl
->rangecount
, gpadl
->range_buflen
);
335 for (i
= 0; i
< gpadl
->rangecount
; i
++) {
336 pagecount
= gpadl
->range
[i
].byte_count
>> PAGE_SHIFT
;
337 pagecount
= (pagecount
> 26) ? 26 : pagecount
;
339 DPRINT_DBG(VMBUS
, "gpadl range %d - len %d offset %d "
340 "page count %d", i
, gpadl
->range
[i
].byte_count
,
341 gpadl
->range
[i
].byte_offset
, pagecount
);
343 for (j
= 0; j
< pagecount
; j
++)
344 DPRINT_DBG(VMBUS
, "%d) pfn %llu", j
,
345 gpadl
->range
[i
].pfn_array
[j
]);
350 * create_gpadl_header - Creates a gpadl for the specified buffer
352 static int create_gpadl_header(void *kbuffer
, u32 size
,
353 struct vmbus_channel_msginfo
**msginfo
,
358 unsigned long long pfn
;
359 struct vmbus_channel_gpadl_header
*gpadl_header
;
360 struct vmbus_channel_gpadl_body
*gpadl_body
;
361 struct vmbus_channel_msginfo
*msgheader
;
362 struct vmbus_channel_msginfo
*msgbody
= NULL
;
365 int pfnsum
, pfncount
, pfnleft
, pfncurr
, pfnsize
;
367 /* ASSERT((kbuffer & (PAGE_SIZE-1)) == 0); */
368 /* ASSERT((Size & (PAGE_SIZE-1)) == 0); */
370 pagecount
= size
>> PAGE_SHIFT
;
371 pfn
= virt_to_phys(kbuffer
) >> PAGE_SHIFT
;
373 /* do we need a gpadl body msg */
374 pfnsize
= MAX_SIZE_CHANNEL_MESSAGE
-
375 sizeof(struct vmbus_channel_gpadl_header
) -
376 sizeof(struct gpa_range
);
377 pfncount
= pfnsize
/ sizeof(u64
);
379 if (pagecount
> pfncount
) {
380 /* we need a gpadl body */
381 /* fill in the header */
382 msgsize
= sizeof(struct vmbus_channel_msginfo
) +
383 sizeof(struct vmbus_channel_gpadl_header
) +
384 sizeof(struct gpa_range
) + pfncount
* sizeof(u64
);
385 msgheader
= kzalloc(msgsize
, GFP_KERNEL
);
389 INIT_LIST_HEAD(&msgheader
->submsglist
);
390 msgheader
->msgsize
= msgsize
;
392 gpadl_header
= (struct vmbus_channel_gpadl_header
*)
394 gpadl_header
->rangecount
= 1;
395 gpadl_header
->range_buflen
= sizeof(struct gpa_range
) +
396 pagecount
* sizeof(u64
);
397 gpadl_header
->range
[0].byte_offset
= 0;
398 gpadl_header
->range
[0].byte_count
= size
;
399 for (i
= 0; i
< pfncount
; i
++)
400 gpadl_header
->range
[0].pfn_array
[i
] = pfn
+i
;
401 *msginfo
= msgheader
;
405 pfnleft
= pagecount
- pfncount
;
407 /* how many pfns can we fit */
408 pfnsize
= MAX_SIZE_CHANNEL_MESSAGE
-
409 sizeof(struct vmbus_channel_gpadl_body
);
410 pfncount
= pfnsize
/ sizeof(u64
);
412 /* fill in the body */
414 if (pfnleft
> pfncount
)
419 msgsize
= sizeof(struct vmbus_channel_msginfo
) +
420 sizeof(struct vmbus_channel_gpadl_body
) +
421 pfncurr
* sizeof(u64
);
422 msgbody
= kzalloc(msgsize
, GFP_KERNEL
);
423 /* FIXME: we probably need to more if this fails */
426 msgbody
->msgsize
= msgsize
;
429 (struct vmbus_channel_gpadl_body
*)msgbody
->msg
;
433 * Gpadl is u32 and we are using a pointer which could
436 /* gpadl_body->Gpadl = kbuffer; */
437 for (i
= 0; i
< pfncurr
; i
++)
438 gpadl_body
->pfn
[i
] = pfn
+ pfnsum
+ i
;
440 /* add to msg header */
441 list_add_tail(&msgbody
->msglistentry
,
442 &msgheader
->submsglist
);
447 /* everything fits in a header */
448 msgsize
= sizeof(struct vmbus_channel_msginfo
) +
449 sizeof(struct vmbus_channel_gpadl_header
) +
450 sizeof(struct gpa_range
) + pagecount
* sizeof(u64
);
451 msgheader
= kzalloc(msgsize
, GFP_KERNEL
);
452 if (msgheader
== NULL
)
454 msgheader
->msgsize
= msgsize
;
456 gpadl_header
= (struct vmbus_channel_gpadl_header
*)
458 gpadl_header
->rangecount
= 1;
459 gpadl_header
->range_buflen
= sizeof(struct gpa_range
) +
460 pagecount
* sizeof(u64
);
461 gpadl_header
->range
[0].byte_offset
= 0;
462 gpadl_header
->range
[0].byte_count
= size
;
463 for (i
= 0; i
< pagecount
; i
++)
464 gpadl_header
->range
[0].pfn_array
[i
] = pfn
+i
;
466 *msginfo
= msgheader
;
478 * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer
480 * @channel: a channel
481 * @kbuffer: from kmalloc
482 * @size: page-size multiple
483 * @gpadl_handle: some funky thing
485 int vmbus_establish_gpadl(struct vmbus_channel
*channel
, void *kbuffer
,
486 u32 size
, u32
*gpadl_handle
)
488 struct vmbus_channel_gpadl_header
*gpadlmsg
;
489 struct vmbus_channel_gpadl_body
*gpadl_body
;
490 /* struct vmbus_channel_gpadl_created *gpadlCreated; */
491 struct vmbus_channel_msginfo
*msginfo
= NULL
;
492 struct vmbus_channel_msginfo
*submsginfo
;
494 struct list_head
*curr
;
495 u32 next_gpadl_handle
;
499 next_gpadl_handle
= atomic_read(&vmbus_connection
.next_gpadl_handle
);
500 atomic_inc(&vmbus_connection
.next_gpadl_handle
);
502 ret
= create_gpadl_header(kbuffer
, size
, &msginfo
, &msgcount
);
506 init_waitqueue_head(&msginfo
->waitevent
);
508 gpadlmsg
= (struct vmbus_channel_gpadl_header
*)msginfo
->msg
;
509 gpadlmsg
->header
.msgtype
= CHANNELMSG_GPADL_HEADER
;
510 gpadlmsg
->child_relid
= channel
->offermsg
.child_relid
;
511 gpadlmsg
->gpadl
= next_gpadl_handle
;
513 dump_gpadl_header(gpadlmsg
);
515 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
516 list_add_tail(&msginfo
->msglistentry
,
517 &vmbus_connection
.chn_msg_list
);
519 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
521 msginfo
->wait_condition
= 0;
522 ret
= vmbus_post_msg(gpadlmsg
, msginfo
->msgsize
-
528 list_for_each(curr
, &msginfo
->submsglist
) {
530 /* FIXME: should this use list_entry() instead ? */
531 submsginfo
= (struct vmbus_channel_msginfo
*)curr
;
533 (struct vmbus_channel_gpadl_body
*)submsginfo
->msg
;
535 gpadl_body
->header
.msgtype
=
536 CHANNELMSG_GPADL_BODY
;
537 gpadl_body
->gpadl
= next_gpadl_handle
;
539 dump_gpadl_body(gpadl_body
, submsginfo
->msgsize
-
540 sizeof(*submsginfo
));
541 ret
= vmbus_post_msg(gpadl_body
,
542 submsginfo
->msgsize
-
543 sizeof(*submsginfo
));
549 wait_event_timeout(msginfo
->waitevent
,
550 msginfo
->wait_condition
,
551 msecs_to_jiffies(1000));
552 BUG_ON(msginfo
->wait_condition
== 0);
555 /* At this point, we received the gpadl created msg */
556 *gpadl_handle
= gpadlmsg
->gpadl
;
559 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
560 list_del(&msginfo
->msglistentry
);
561 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
566 EXPORT_SYMBOL_GPL(vmbus_establish_gpadl
);
569 * vmbus_teardown_gpadl -Teardown the specified GPADL handle
571 int vmbus_teardown_gpadl(struct vmbus_channel
*channel
, u32 gpadl_handle
)
573 struct vmbus_channel_gpadl_teardown
*msg
;
574 struct vmbus_channel_msginfo
*info
;
578 /* ASSERT(gpadl_handle != 0); */
580 info
= kmalloc(sizeof(*info
) +
581 sizeof(struct vmbus_channel_gpadl_teardown
), GFP_KERNEL
);
585 init_waitqueue_head(&info
->waitevent
);
587 msg
= (struct vmbus_channel_gpadl_teardown
*)info
->msg
;
589 msg
->header
.msgtype
= CHANNELMSG_GPADL_TEARDOWN
;
590 msg
->child_relid
= channel
->offermsg
.child_relid
;
591 msg
->gpadl
= gpadl_handle
;
593 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
594 list_add_tail(&info
->msglistentry
,
595 &vmbus_connection
.chn_msg_list
);
596 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
597 info
->wait_condition
= 0;
598 ret
= vmbus_post_msg(msg
,
599 sizeof(struct vmbus_channel_gpadl_teardown
));
602 wait_event_timeout(info
->waitevent
,
603 info
->wait_condition
, msecs_to_jiffies(1000));
604 BUG_ON(info
->wait_condition
== 0);
606 /* Received a torndown response */
607 spin_lock_irqsave(&vmbus_connection
.channelmsg_lock
, flags
);
608 list_del(&info
->msglistentry
);
609 spin_unlock_irqrestore(&vmbus_connection
.channelmsg_lock
, flags
);
614 EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl
);
617 * vmbus_close - Close the specified channel
619 void vmbus_close(struct vmbus_channel
*channel
)
621 struct vmbus_channel_close_channel
*msg
;
622 struct vmbus_channel_msginfo
*info
;
626 /* Stop callback and cancel the timer asap */
627 channel
->onchannel_callback
= NULL
;
628 del_timer_sync(&channel
->poll_timer
);
630 /* Send a closing message */
631 info
= kmalloc(sizeof(*info
) +
632 sizeof(struct vmbus_channel_close_channel
), GFP_KERNEL
);
633 /* FIXME: can't do anything other than return here because the
634 * function is void */
639 msg
= (struct vmbus_channel_close_channel
*)info
->msg
;
640 msg
->header
.msgtype
= CHANNELMSG_CLOSECHANNEL
;
641 msg
->child_relid
= channel
->offermsg
.child_relid
;
643 ret
= vmbus_post_msg(msg
, sizeof(struct vmbus_channel_close_channel
));
646 /* Tear down the gpadl for the channel's ring buffer */
647 if (channel
->ringbuffer_gpadlhandle
)
648 vmbus_teardown_gpadl(channel
,
649 channel
->ringbuffer_gpadlhandle
);
651 /* TODO: Send a msg to release the childRelId */
653 /* Cleanup the ring buffers for this channel */
654 hv_ringbuffer_cleanup(&channel
->outbound
);
655 hv_ringbuffer_cleanup(&channel
->inbound
);
657 free_pages((unsigned long)channel
->ringbuffer_pages
,
658 get_order(channel
->ringbuffer_pagecount
* PAGE_SIZE
));
663 * If we are closing the channel during an error path in
664 * opening the channel, don't free the channel since the
665 * caller will free the channel
668 if (channel
->state
== CHANNEL_OPEN_STATE
) {
669 spin_lock_irqsave(&vmbus_connection
.channel_lock
, flags
);
670 list_del(&channel
->listentry
);
671 spin_unlock_irqrestore(&vmbus_connection
.channel_lock
, flags
);
673 free_channel(channel
);
676 EXPORT_SYMBOL_GPL(vmbus_close
);
679 * vmbus_sendpacket() - Send the specified buffer on the given channel
680 * @channel: Pointer to vmbus_channel structure.
681 * @buffer: Pointer to the buffer you want to receive the data into.
682 * @bufferlen: Maximum size of what the the buffer will hold
683 * @requestid: Identifier of the request
684 * @type: Type of packet that is being send e.g. negotiate, time
687 * Sends data in @buffer directly to hyper-v via the vmbus
688 * This will send the data unparsed to hyper-v.
690 * Mainly used by Hyper-V drivers.
692 int vmbus_sendpacket(struct vmbus_channel
*channel
, const void *buffer
,
693 u32 bufferlen
, u64 requestid
,
694 enum vmbus_packet_type type
, u32 flags
)
696 struct vmpacket_descriptor desc
;
697 u32 packetlen
= sizeof(struct vmpacket_descriptor
) + bufferlen
;
698 u32 packetlen_aligned
= ALIGN(packetlen
, sizeof(u64
));
699 struct scatterlist bufferlist
[3];
700 u64 aligned_data
= 0;
703 dump_vmbus_channel(channel
);
705 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
707 /* Setup the descriptor */
708 desc
.type
= type
; /* VmbusPacketTypeDataInBand; */
709 desc
.flags
= flags
; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
710 /* in 8-bytes granularity */
711 desc
.offset8
= sizeof(struct vmpacket_descriptor
) >> 3;
712 desc
.len8
= (u16
)(packetlen_aligned
>> 3);
713 desc
.trans_id
= requestid
;
715 sg_init_table(bufferlist
, 3);
716 sg_set_buf(&bufferlist
[0], &desc
, sizeof(struct vmpacket_descriptor
));
717 sg_set_buf(&bufferlist
[1], buffer
, bufferlen
);
718 sg_set_buf(&bufferlist
[2], &aligned_data
,
719 packetlen_aligned
- packetlen
);
721 ret
= hv_ringbuffer_write(&channel
->outbound
, bufferlist
, 3);
723 /* TODO: We should determine if this is optional */
724 if (ret
== 0 && !hv_get_ringbuffer_interrupt_mask(&channel
->outbound
))
725 vmbus_setevent(channel
);
729 EXPORT_SYMBOL(vmbus_sendpacket
);
732 * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
733 * packets using a GPADL Direct packet type.
735 int vmbus_sendpacket_pagebuffer(struct vmbus_channel
*channel
,
736 struct hv_page_buffer pagebuffers
[],
737 u32 pagecount
, void *buffer
, u32 bufferlen
,
742 struct vmbus_channel_packet_page_buffer desc
;
745 u32 packetlen_aligned
;
746 struct scatterlist bufferlist
[3];
747 u64 aligned_data
= 0;
749 if (pagecount
> MAX_PAGE_BUFFER_COUNT
)
752 dump_vmbus_channel(channel
);
755 * Adjust the size down since vmbus_channel_packet_page_buffer is the
756 * largest size we support
758 descsize
= sizeof(struct vmbus_channel_packet_page_buffer
) -
759 ((MAX_PAGE_BUFFER_COUNT
- pagecount
) *
760 sizeof(struct hv_page_buffer
));
761 packetlen
= descsize
+ bufferlen
;
762 packetlen_aligned
= ALIGN(packetlen
, sizeof(u64
));
764 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
766 /* Setup the descriptor */
767 desc
.type
= VM_PKT_DATA_USING_GPA_DIRECT
;
768 desc
.flags
= VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
;
769 desc
.dataoffset8
= descsize
>> 3; /* in 8-bytes grandularity */
770 desc
.length8
= (u16
)(packetlen_aligned
>> 3);
771 desc
.transactionid
= requestid
;
772 desc
.rangecount
= pagecount
;
774 for (i
= 0; i
< pagecount
; i
++) {
775 desc
.range
[i
].len
= pagebuffers
[i
].len
;
776 desc
.range
[i
].offset
= pagebuffers
[i
].offset
;
777 desc
.range
[i
].pfn
= pagebuffers
[i
].pfn
;
780 sg_init_table(bufferlist
, 3);
781 sg_set_buf(&bufferlist
[0], &desc
, descsize
);
782 sg_set_buf(&bufferlist
[1], buffer
, bufferlen
);
783 sg_set_buf(&bufferlist
[2], &aligned_data
,
784 packetlen_aligned
- packetlen
);
786 ret
= hv_ringbuffer_write(&channel
->outbound
, bufferlist
, 3);
788 /* TODO: We should determine if this is optional */
789 if (ret
== 0 && !hv_get_ringbuffer_interrupt_mask(&channel
->outbound
))
790 vmbus_setevent(channel
);
794 EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer
);
797 * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
798 * using a GPADL Direct packet type.
800 int vmbus_sendpacket_multipagebuffer(struct vmbus_channel
*channel
,
801 struct hv_multipage_buffer
*multi_pagebuffer
,
802 void *buffer
, u32 bufferlen
, u64 requestid
)
805 struct vmbus_channel_packet_multipage_buffer desc
;
808 u32 packetlen_aligned
;
809 struct scatterlist bufferlist
[3];
810 u64 aligned_data
= 0;
811 u32 pfncount
= NUM_PAGES_SPANNED(multi_pagebuffer
->offset
,
812 multi_pagebuffer
->len
);
814 dump_vmbus_channel(channel
);
816 if ((pfncount
< 0) || (pfncount
> MAX_MULTIPAGE_BUFFER_COUNT
))
820 * Adjust the size down since vmbus_channel_packet_multipage_buffer is
821 * the largest size we support
823 descsize
= sizeof(struct vmbus_channel_packet_multipage_buffer
) -
824 ((MAX_MULTIPAGE_BUFFER_COUNT
- pfncount
) *
826 packetlen
= descsize
+ bufferlen
;
827 packetlen_aligned
= ALIGN(packetlen
, sizeof(u64
));
829 /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */
831 /* Setup the descriptor */
832 desc
.type
= VM_PKT_DATA_USING_GPA_DIRECT
;
833 desc
.flags
= VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED
;
834 desc
.dataoffset8
= descsize
>> 3; /* in 8-bytes grandularity */
835 desc
.length8
= (u16
)(packetlen_aligned
>> 3);
836 desc
.transactionid
= requestid
;
839 desc
.range
.len
= multi_pagebuffer
->len
;
840 desc
.range
.offset
= multi_pagebuffer
->offset
;
842 memcpy(desc
.range
.pfn_array
, multi_pagebuffer
->pfn_array
,
843 pfncount
* sizeof(u64
));
845 sg_init_table(bufferlist
, 3);
846 sg_set_buf(&bufferlist
[0], &desc
, descsize
);
847 sg_set_buf(&bufferlist
[1], buffer
, bufferlen
);
848 sg_set_buf(&bufferlist
[2], &aligned_data
,
849 packetlen_aligned
- packetlen
);
851 ret
= hv_ringbuffer_write(&channel
->outbound
, bufferlist
, 3);
853 /* TODO: We should determine if this is optional */
854 if (ret
== 0 && !hv_get_ringbuffer_interrupt_mask(&channel
->outbound
))
855 vmbus_setevent(channel
);
859 EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer
);
862 * vmbus_recvpacket() - Retrieve the user packet on the specified channel
863 * @channel: Pointer to vmbus_channel structure.
864 * @buffer: Pointer to the buffer you want to receive the data into.
865 * @bufferlen: Maximum size of what the the buffer will hold
866 * @buffer_actual_len: The actual size of the data after it was received
867 * @requestid: Identifier of the request
869 * Receives directly from the hyper-v vmbus and puts the data it received
870 * into Buffer. This will receive the data unparsed from hyper-v.
872 * Mainly used by Hyper-V drivers.
874 int vmbus_recvpacket(struct vmbus_channel
*channel
, void *buffer
,
875 u32 bufferlen
, u32
*buffer_actual_len
, u64
*requestid
)
877 struct vmpacket_descriptor desc
;
883 *buffer_actual_len
= 0;
886 spin_lock_irqsave(&channel
->inbound_lock
, flags
);
888 ret
= hv_ringbuffer_peek(&channel
->inbound
, &desc
,
889 sizeof(struct vmpacket_descriptor
));
891 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
895 /* VmbusChannelClearEvent(Channel); */
897 packetlen
= desc
.len8
<< 3;
898 userlen
= packetlen
- (desc
.offset8
<< 3);
899 /* ASSERT(userLen > 0); */
901 *buffer_actual_len
= userlen
;
903 if (userlen
> bufferlen
) {
904 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
906 pr_err("Buffer too small - got %d needs %d\n",
911 *requestid
= desc
.trans_id
;
913 /* Copy over the packet to the user buffer */
914 ret
= hv_ringbuffer_read(&channel
->inbound
, buffer
, userlen
,
915 (desc
.offset8
<< 3));
917 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
921 EXPORT_SYMBOL(vmbus_recvpacket
);
924 * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel
926 int vmbus_recvpacket_raw(struct vmbus_channel
*channel
, void *buffer
,
927 u32 bufferlen
, u32
*buffer_actual_len
,
930 struct vmpacket_descriptor desc
;
936 *buffer_actual_len
= 0;
939 spin_lock_irqsave(&channel
->inbound_lock
, flags
);
941 ret
= hv_ringbuffer_peek(&channel
->inbound
, &desc
,
942 sizeof(struct vmpacket_descriptor
));
944 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
948 /* VmbusChannelClearEvent(Channel); */
950 packetlen
= desc
.len8
<< 3;
951 userlen
= packetlen
- (desc
.offset8
<< 3);
953 *buffer_actual_len
= packetlen
;
955 if (packetlen
> bufferlen
) {
956 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
958 pr_err("Buffer too small - needed %d bytes but "
959 "got space for only %d bytes\n",
960 packetlen
, bufferlen
);
964 *requestid
= desc
.trans_id
;
966 /* Copy over the entire packet to the user buffer */
967 ret
= hv_ringbuffer_read(&channel
->inbound
, buffer
, packetlen
, 0);
969 spin_unlock_irqrestore(&channel
->inbound_lock
, flags
);
972 EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw
);
975 * vmbus_onchannel_event - Channel event callback
977 void vmbus_onchannel_event(struct vmbus_channel
*channel
)
979 dump_vmbus_channel(channel
);
980 /* ASSERT(Channel->OnChannelCallback); */
982 channel
->onchannel_callback(channel
->channel_callback_context
);
984 mod_timer(&channel
->poll_timer
, jiffies
+ usecs_to_jiffies(100));
988 * vmbus_ontimer - Timer event callback
990 void vmbus_ontimer(unsigned long data
)
992 struct vmbus_channel
*channel
= (struct vmbus_channel
*)data
;
994 if (channel
->onchannel_callback
)
995 channel
->onchannel_callback(channel
->channel_callback_context
);
999 * dump_vmbus_channel- Dump vmbus channel info to the console
1001 static void dump_vmbus_channel(struct vmbus_channel
*channel
)
1003 DPRINT_DBG(VMBUS
, "Channel (%d)", channel
->offermsg
.child_relid
);
1004 dump_ring_info(&channel
->outbound
, "Outbound ");
1005 dump_ring_info(&channel
->inbound
, "Inbound ");