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>
29 #include <linux/hyperv.h>
30 #include <linux/uio.h>
31 #include <linux/interrupt.h>
33 #include "hyperv_vmbus.h"
35 #define NUM_PAGES_SPANNED(addr, len) \
36 ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT))
39 * vmbus_setevent- Trigger an event notification on the specified
42 void vmbus_setevent(struct vmbus_channel *channel)
44 struct hv_monitor_page *monitorpage;
47 * For channels marked as in "low latency" mode
48 * bypass the monitor page mechanism.
50 if (channel->offermsg.monitor_allocated && !channel->low_latency) {
51 vmbus_send_interrupt(channel->offermsg.child_relid);
53 /* Get the child to parent monitor page */
54 monitorpage = vmbus_connection.monitor_pages[1];
56 sync_set_bit(channel->monitor_bit,
57 (unsigned long *)&monitorpage->trigger_group
58 [channel->monitor_grp].pending);
61 vmbus_set_event(channel);
64 EXPORT_SYMBOL_GPL(vmbus_setevent);
67 * vmbus_open - Open the specified channel.
69 int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size,
70 u32 recv_ringbuffer_size, void *userdata, u32 userdatalen,
71 void (*onchannelcallback)(void *context), void *context)
73 struct vmbus_channel_open_channel *open_msg;
74 struct vmbus_channel_msginfo *open_info = NULL;
79 if (send_ringbuffer_size % PAGE_SIZE ||
80 recv_ringbuffer_size % PAGE_SIZE)
83 spin_lock_irqsave(&newchannel->lock, flags);
84 if (newchannel->state == CHANNEL_OPEN_STATE) {
85 newchannel->state = CHANNEL_OPENING_STATE;
87 spin_unlock_irqrestore(&newchannel->lock, flags);
90 spin_unlock_irqrestore(&newchannel->lock, flags);
92 newchannel->onchannel_callback = onchannelcallback;
93 newchannel->channel_callback_context = context;
95 /* Allocate the ring buffer */
96 page = alloc_pages_node(cpu_to_node(newchannel->target_cpu),
97 GFP_KERNEL|__GFP_ZERO,
98 get_order(send_ringbuffer_size +
99 recv_ringbuffer_size));
102 page = alloc_pages(GFP_KERNEL|__GFP_ZERO,
103 get_order(send_ringbuffer_size +
104 recv_ringbuffer_size));
108 goto error_set_chnstate;
111 newchannel->ringbuffer_pages = page_address(page);
112 newchannel->ringbuffer_pagecount = (send_ringbuffer_size +
113 recv_ringbuffer_size) >> PAGE_SHIFT;
115 ret = hv_ringbuffer_init(&newchannel->outbound, page,
116 send_ringbuffer_size >> PAGE_SHIFT);
120 goto error_free_pages;
123 ret = hv_ringbuffer_init(&newchannel->inbound,
124 &page[send_ringbuffer_size >> PAGE_SHIFT],
125 recv_ringbuffer_size >> PAGE_SHIFT);
128 goto error_free_pages;
132 /* Establish the gpadl for the ring buffer */
133 newchannel->ringbuffer_gpadlhandle = 0;
135 ret = vmbus_establish_gpadl(newchannel,
137 send_ringbuffer_size +
138 recv_ringbuffer_size,
139 &newchannel->ringbuffer_gpadlhandle);
143 goto error_free_pages;
146 /* Create and init the channel open message */
147 open_info = kmalloc(sizeof(*open_info) +
148 sizeof(struct vmbus_channel_open_channel),
152 goto error_free_gpadl;
155 init_completion(&open_info->waitevent);
156 open_info->waiting_channel = newchannel;
158 open_msg = (struct vmbus_channel_open_channel *)open_info->msg;
159 open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL;
160 open_msg->openid = newchannel->offermsg.child_relid;
161 open_msg->child_relid = newchannel->offermsg.child_relid;
162 open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle;
163 open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >>
165 open_msg->target_vp = newchannel->target_vp;
167 if (userdatalen > MAX_USER_DEFINED_BYTES) {
169 goto error_free_gpadl;
173 memcpy(open_msg->userdata, userdata, userdatalen);
175 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
176 list_add_tail(&open_info->msglistentry,
177 &vmbus_connection.chn_msg_list);
178 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
180 ret = vmbus_post_msg(open_msg,
181 sizeof(struct vmbus_channel_open_channel), true);
185 goto error_clean_msglist;
188 wait_for_completion(&open_info->waitevent);
190 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
191 list_del(&open_info->msglistentry);
192 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
194 if (newchannel->rescind) {
196 goto error_free_gpadl;
199 if (open_info->response.open_result.status) {
201 goto error_free_gpadl;
204 newchannel->state = CHANNEL_OPENED_STATE;
209 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
210 list_del(&open_info->msglistentry);
211 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
214 vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle);
217 hv_ringbuffer_cleanup(&newchannel->outbound);
218 hv_ringbuffer_cleanup(&newchannel->inbound);
220 get_order(send_ringbuffer_size + recv_ringbuffer_size));
222 newchannel->state = CHANNEL_OPEN_STATE;
225 EXPORT_SYMBOL_GPL(vmbus_open);
227 /* Used for Hyper-V Socket: a guest client's connect() to the host */
228 int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id,
229 const uuid_le *shv_host_servie_id)
231 struct vmbus_channel_tl_connect_request conn_msg;
233 memset(&conn_msg, 0, sizeof(conn_msg));
234 conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST;
235 conn_msg.guest_endpoint_id = *shv_guest_servie_id;
236 conn_msg.host_service_id = *shv_host_servie_id;
238 return vmbus_post_msg(&conn_msg, sizeof(conn_msg), true);
240 EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request);
243 * create_gpadl_header - Creates a gpadl for the specified buffer
245 static int create_gpadl_header(void *kbuffer, u32 size,
246 struct vmbus_channel_msginfo **msginfo)
250 struct vmbus_channel_gpadl_header *gpadl_header;
251 struct vmbus_channel_gpadl_body *gpadl_body;
252 struct vmbus_channel_msginfo *msgheader;
253 struct vmbus_channel_msginfo *msgbody = NULL;
256 int pfnsum, pfncount, pfnleft, pfncurr, pfnsize;
258 pagecount = size >> PAGE_SHIFT;
260 /* do we need a gpadl body msg */
261 pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
262 sizeof(struct vmbus_channel_gpadl_header) -
263 sizeof(struct gpa_range);
264 pfncount = pfnsize / sizeof(u64);
266 if (pagecount > pfncount) {
267 /* we need a gpadl body */
268 /* fill in the header */
269 msgsize = sizeof(struct vmbus_channel_msginfo) +
270 sizeof(struct vmbus_channel_gpadl_header) +
271 sizeof(struct gpa_range) + pfncount * sizeof(u64);
272 msgheader = kzalloc(msgsize, GFP_KERNEL);
276 INIT_LIST_HEAD(&msgheader->submsglist);
277 msgheader->msgsize = msgsize;
279 gpadl_header = (struct vmbus_channel_gpadl_header *)
281 gpadl_header->rangecount = 1;
282 gpadl_header->range_buflen = sizeof(struct gpa_range) +
283 pagecount * sizeof(u64);
284 gpadl_header->range[0].byte_offset = 0;
285 gpadl_header->range[0].byte_count = size;
286 for (i = 0; i < pfncount; i++)
287 gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys(
288 kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT;
289 *msginfo = msgheader;
292 pfnleft = pagecount - pfncount;
294 /* how many pfns can we fit */
295 pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
296 sizeof(struct vmbus_channel_gpadl_body);
297 pfncount = pfnsize / sizeof(u64);
299 /* fill in the body */
301 if (pfnleft > pfncount)
306 msgsize = sizeof(struct vmbus_channel_msginfo) +
307 sizeof(struct vmbus_channel_gpadl_body) +
308 pfncurr * sizeof(u64);
309 msgbody = kzalloc(msgsize, GFP_KERNEL);
312 struct vmbus_channel_msginfo *pos = NULL;
313 struct vmbus_channel_msginfo *tmp = NULL;
315 * Free up all the allocated messages.
317 list_for_each_entry_safe(pos, tmp,
318 &msgheader->submsglist,
321 list_del(&pos->msglistentry);
328 msgbody->msgsize = msgsize;
330 (struct vmbus_channel_gpadl_body *)msgbody->msg;
333 * Gpadl is u32 and we are using a pointer which could
335 * This is governed by the guest/host protocol and
336 * so the hypervisor gurantees that this is ok.
338 for (i = 0; i < pfncurr; i++)
339 gpadl_body->pfn[i] = slow_virt_to_phys(
340 kbuffer + PAGE_SIZE * (pfnsum + i)) >>
343 /* add to msg header */
344 list_add_tail(&msgbody->msglistentry,
345 &msgheader->submsglist);
350 /* everything fits in a header */
351 msgsize = sizeof(struct vmbus_channel_msginfo) +
352 sizeof(struct vmbus_channel_gpadl_header) +
353 sizeof(struct gpa_range) + pagecount * sizeof(u64);
354 msgheader = kzalloc(msgsize, GFP_KERNEL);
355 if (msgheader == NULL)
358 INIT_LIST_HEAD(&msgheader->submsglist);
359 msgheader->msgsize = msgsize;
361 gpadl_header = (struct vmbus_channel_gpadl_header *)
363 gpadl_header->rangecount = 1;
364 gpadl_header->range_buflen = sizeof(struct gpa_range) +
365 pagecount * sizeof(u64);
366 gpadl_header->range[0].byte_offset = 0;
367 gpadl_header->range[0].byte_count = size;
368 for (i = 0; i < pagecount; i++)
369 gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys(
370 kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT;
372 *msginfo = msgheader;
383 * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer
385 * @channel: a channel
386 * @kbuffer: from kmalloc or vmalloc
387 * @size: page-size multiple
388 * @gpadl_handle: some funky thing
390 int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer,
391 u32 size, u32 *gpadl_handle)
393 struct vmbus_channel_gpadl_header *gpadlmsg;
394 struct vmbus_channel_gpadl_body *gpadl_body;
395 struct vmbus_channel_msginfo *msginfo = NULL;
396 struct vmbus_channel_msginfo *submsginfo, *tmp;
397 struct list_head *curr;
398 u32 next_gpadl_handle;
403 (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1);
405 ret = create_gpadl_header(kbuffer, size, &msginfo);
409 init_completion(&msginfo->waitevent);
410 msginfo->waiting_channel = channel;
412 gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg;
413 gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER;
414 gpadlmsg->child_relid = channel->offermsg.child_relid;
415 gpadlmsg->gpadl = next_gpadl_handle;
418 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
419 list_add_tail(&msginfo->msglistentry,
420 &vmbus_connection.chn_msg_list);
422 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
424 ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize -
425 sizeof(*msginfo), true);
429 list_for_each(curr, &msginfo->submsglist) {
430 submsginfo = (struct vmbus_channel_msginfo *)curr;
432 (struct vmbus_channel_gpadl_body *)submsginfo->msg;
434 gpadl_body->header.msgtype =
435 CHANNELMSG_GPADL_BODY;
436 gpadl_body->gpadl = next_gpadl_handle;
438 ret = vmbus_post_msg(gpadl_body,
439 submsginfo->msgsize - sizeof(*submsginfo),
445 wait_for_completion(&msginfo->waitevent);
447 if (channel->rescind) {
452 /* At this point, we received the gpadl created msg */
453 *gpadl_handle = gpadlmsg->gpadl;
456 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
457 list_del(&msginfo->msglistentry);
458 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
459 list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist,
467 EXPORT_SYMBOL_GPL(vmbus_establish_gpadl);
470 * vmbus_teardown_gpadl -Teardown the specified GPADL handle
472 int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle)
474 struct vmbus_channel_gpadl_teardown *msg;
475 struct vmbus_channel_msginfo *info;
479 info = kmalloc(sizeof(*info) +
480 sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL);
484 init_completion(&info->waitevent);
485 info->waiting_channel = channel;
487 msg = (struct vmbus_channel_gpadl_teardown *)info->msg;
489 msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN;
490 msg->child_relid = channel->offermsg.child_relid;
491 msg->gpadl = gpadl_handle;
493 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
494 list_add_tail(&info->msglistentry,
495 &vmbus_connection.chn_msg_list);
496 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
497 ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_gpadl_teardown),
503 wait_for_completion(&info->waitevent);
505 if (channel->rescind) {
511 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
512 list_del(&info->msglistentry);
513 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
518 EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl);
520 static void reset_channel_cb(void *arg)
522 struct vmbus_channel *channel = arg;
524 channel->onchannel_callback = NULL;
527 static int vmbus_close_internal(struct vmbus_channel *channel)
529 struct vmbus_channel_close_channel *msg;
533 * vmbus_on_event(), running in the tasklet, can race
534 * with vmbus_close_internal() in the case of SMP guest, e.g., when
535 * the former is accessing channel->inbound.ring_buffer, the latter
536 * could be freeing the ring_buffer pages.
538 * To resolve the race, we can serialize them by disabling the
539 * tasklet when the latter is running here.
541 hv_event_tasklet_disable(channel);
544 * In case a device driver's probe() fails (e.g.,
545 * util_probe() -> vmbus_open() returns -ENOMEM) and the device is
546 * rescinded later (e.g., we dynamically disble an Integrated Service
547 * in Hyper-V Manager), the driver's remove() invokes vmbus_close():
548 * here we should skip most of the below cleanup work.
550 if (channel->state != CHANNEL_OPENED_STATE) {
555 channel->state = CHANNEL_OPEN_STATE;
556 channel->sc_creation_callback = NULL;
557 /* Stop callback and cancel the timer asap */
558 if (channel->target_cpu != get_cpu()) {
560 smp_call_function_single(channel->target_cpu, reset_channel_cb,
563 reset_channel_cb(channel);
567 /* Send a closing message */
569 msg = &channel->close_msg.msg;
571 msg->header.msgtype = CHANNELMSG_CLOSECHANNEL;
572 msg->child_relid = channel->offermsg.child_relid;
574 ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel),
578 pr_err("Close failed: close post msg return is %d\n", ret);
580 * If we failed to post the close msg,
581 * it is perhaps better to leak memory.
586 /* Tear down the gpadl for the channel's ring buffer */
587 if (channel->ringbuffer_gpadlhandle) {
588 ret = vmbus_teardown_gpadl(channel,
589 channel->ringbuffer_gpadlhandle);
591 pr_err("Close failed: teardown gpadl return %d\n", ret);
593 * If we failed to teardown gpadl,
594 * it is perhaps better to leak memory.
600 /* Cleanup the ring buffers for this channel */
601 hv_ringbuffer_cleanup(&channel->outbound);
602 hv_ringbuffer_cleanup(&channel->inbound);
604 free_pages((unsigned long)channel->ringbuffer_pages,
605 get_order(channel->ringbuffer_pagecount * PAGE_SIZE));
608 hv_event_tasklet_enable(channel);
614 * vmbus_close - Close the specified channel
616 void vmbus_close(struct vmbus_channel *channel)
618 struct list_head *cur, *tmp;
619 struct vmbus_channel *cur_channel;
621 if (channel->primary_channel != NULL) {
623 * We will only close sub-channels when
624 * the primary is closed.
629 * Close all the sub-channels first and then close the
632 list_for_each_safe(cur, tmp, &channel->sc_list) {
633 cur_channel = list_entry(cur, struct vmbus_channel, sc_list);
634 if (cur_channel->state != CHANNEL_OPENED_STATE)
636 vmbus_close_internal(cur_channel);
639 * Now close the primary.
641 vmbus_close_internal(channel);
643 EXPORT_SYMBOL_GPL(vmbus_close);
645 int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer,
646 u32 bufferlen, u64 requestid,
647 enum vmbus_packet_type type, u32 flags)
649 struct vmpacket_descriptor desc;
650 u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen;
651 u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
652 struct kvec bufferlist[3];
653 u64 aligned_data = 0;
654 int num_vecs = ((bufferlen != 0) ? 3 : 1);
657 /* Setup the descriptor */
658 desc.type = type; /* VmbusPacketTypeDataInBand; */
659 desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */
660 /* in 8-bytes granularity */
661 desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3;
662 desc.len8 = (u16)(packetlen_aligned >> 3);
663 desc.trans_id = requestid;
665 bufferlist[0].iov_base = &desc;
666 bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor);
667 bufferlist[1].iov_base = buffer;
668 bufferlist[1].iov_len = bufferlen;
669 bufferlist[2].iov_base = &aligned_data;
670 bufferlist[2].iov_len = (packetlen_aligned - packetlen);
672 return hv_ringbuffer_write(channel, bufferlist, num_vecs);
674 EXPORT_SYMBOL(vmbus_sendpacket_ctl);
677 * vmbus_sendpacket() - Send the specified buffer on the given channel
678 * @channel: Pointer to vmbus_channel structure.
679 * @buffer: Pointer to the buffer you want to receive the data into.
680 * @bufferlen: Maximum size of what the the buffer will hold
681 * @requestid: Identifier of the request
682 * @type: Type of packet that is being send e.g. negotiate, time
685 * Sends data in @buffer directly to hyper-v via the vmbus
686 * This will send the data unparsed to hyper-v.
688 * Mainly used by Hyper-V drivers.
690 int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
691 u32 bufferlen, u64 requestid,
692 enum vmbus_packet_type type, u32 flags)
694 return vmbus_sendpacket_ctl(channel, buffer, bufferlen, requestid,
697 EXPORT_SYMBOL(vmbus_sendpacket);
700 * vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer
701 * packets using a GPADL Direct packet type. This interface allows you
702 * to control notifying the host. This will be useful for sending
703 * batched data. Also the sender can control the send flags
706 int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel,
707 struct hv_page_buffer pagebuffers[],
708 u32 pagecount, void *buffer, u32 bufferlen,
709 u64 requestid, u32 flags)
712 struct vmbus_channel_packet_page_buffer desc;
715 u32 packetlen_aligned;
716 struct kvec bufferlist[3];
717 u64 aligned_data = 0;
719 if (pagecount > MAX_PAGE_BUFFER_COUNT)
723 * Adjust the size down since vmbus_channel_packet_page_buffer is the
724 * largest size we support
726 descsize = sizeof(struct vmbus_channel_packet_page_buffer) -
727 ((MAX_PAGE_BUFFER_COUNT - pagecount) *
728 sizeof(struct hv_page_buffer));
729 packetlen = descsize + bufferlen;
730 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
732 /* Setup the descriptor */
733 desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
735 desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
736 desc.length8 = (u16)(packetlen_aligned >> 3);
737 desc.transactionid = requestid;
738 desc.rangecount = pagecount;
740 for (i = 0; i < pagecount; i++) {
741 desc.range[i].len = pagebuffers[i].len;
742 desc.range[i].offset = pagebuffers[i].offset;
743 desc.range[i].pfn = pagebuffers[i].pfn;
746 bufferlist[0].iov_base = &desc;
747 bufferlist[0].iov_len = descsize;
748 bufferlist[1].iov_base = buffer;
749 bufferlist[1].iov_len = bufferlen;
750 bufferlist[2].iov_base = &aligned_data;
751 bufferlist[2].iov_len = (packetlen_aligned - packetlen);
753 return hv_ringbuffer_write(channel, bufferlist, 3);
755 EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer_ctl);
758 * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
759 * packets using a GPADL Direct packet type.
761 int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
762 struct hv_page_buffer pagebuffers[],
763 u32 pagecount, void *buffer, u32 bufferlen,
766 u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
768 return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount,
773 EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
776 * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
777 * using a GPADL Direct packet type.
778 * The buffer includes the vmbus descriptor.
780 int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
781 struct vmbus_packet_mpb_array *desc,
783 void *buffer, u32 bufferlen, u64 requestid)
786 u32 packetlen_aligned;
787 struct kvec bufferlist[3];
788 u64 aligned_data = 0;
790 packetlen = desc_size + bufferlen;
791 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
793 /* Setup the descriptor */
794 desc->type = VM_PKT_DATA_USING_GPA_DIRECT;
795 desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
796 desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */
797 desc->length8 = (u16)(packetlen_aligned >> 3);
798 desc->transactionid = requestid;
799 desc->rangecount = 1;
801 bufferlist[0].iov_base = desc;
802 bufferlist[0].iov_len = desc_size;
803 bufferlist[1].iov_base = buffer;
804 bufferlist[1].iov_len = bufferlen;
805 bufferlist[2].iov_base = &aligned_data;
806 bufferlist[2].iov_len = (packetlen_aligned - packetlen);
808 return hv_ringbuffer_write(channel, bufferlist, 3);
810 EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc);
813 * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet
814 * using a GPADL Direct packet type.
816 int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel,
817 struct hv_multipage_buffer *multi_pagebuffer,
818 void *buffer, u32 bufferlen, u64 requestid)
820 struct vmbus_channel_packet_multipage_buffer desc;
823 u32 packetlen_aligned;
824 struct kvec bufferlist[3];
825 u64 aligned_data = 0;
826 u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset,
827 multi_pagebuffer->len);
829 if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)
833 * Adjust the size down since vmbus_channel_packet_multipage_buffer is
834 * the largest size we support
836 descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) -
837 ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) *
839 packetlen = descsize + bufferlen;
840 packetlen_aligned = ALIGN(packetlen, sizeof(u64));
843 /* Setup the descriptor */
844 desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
845 desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
846 desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */
847 desc.length8 = (u16)(packetlen_aligned >> 3);
848 desc.transactionid = requestid;
851 desc.range.len = multi_pagebuffer->len;
852 desc.range.offset = multi_pagebuffer->offset;
854 memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array,
855 pfncount * sizeof(u64));
857 bufferlist[0].iov_base = &desc;
858 bufferlist[0].iov_len = descsize;
859 bufferlist[1].iov_base = buffer;
860 bufferlist[1].iov_len = bufferlen;
861 bufferlist[2].iov_base = &aligned_data;
862 bufferlist[2].iov_len = (packetlen_aligned - packetlen);
864 return hv_ringbuffer_write(channel, bufferlist, 3);
866 EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer);
869 * vmbus_recvpacket() - Retrieve the user packet on the specified channel
870 * @channel: Pointer to vmbus_channel structure.
871 * @buffer: Pointer to the buffer you want to receive the data into.
872 * @bufferlen: Maximum size of what the the buffer will hold
873 * @buffer_actual_len: The actual size of the data after it was received
874 * @requestid: Identifier of the request
876 * Receives directly from the hyper-v vmbus and puts the data it received
877 * into Buffer. This will receive the data unparsed from hyper-v.
879 * Mainly used by Hyper-V drivers.
882 __vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
883 u32 bufferlen, u32 *buffer_actual_len, u64 *requestid,
886 return hv_ringbuffer_read(channel, buffer, bufferlen,
887 buffer_actual_len, requestid, raw);
891 int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer,
892 u32 bufferlen, u32 *buffer_actual_len,
895 return __vmbus_recvpacket(channel, buffer, bufferlen,
896 buffer_actual_len, requestid, false);
898 EXPORT_SYMBOL(vmbus_recvpacket);
901 * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel
903 int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer,
904 u32 bufferlen, u32 *buffer_actual_len,
907 return __vmbus_recvpacket(channel, buffer, bufferlen,
908 buffer_actual_len, requestid, true);
910 EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw);