Commit | Line | Data |
---|---|---|
3e7ee490 | 1 | /* |
3e7ee490 HJ |
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> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
5654e932 | 23 | #include <linux/kernel.h> |
0c3b7b2f S |
24 | #include <linux/sched.h> |
25 | #include <linux/wait.h> | |
a0086dc5 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
c88c4e4c | 28 | #include <linux/module.h> |
46a97191 | 29 | #include <linux/hyperv.h> |
3f335ea2 | 30 | |
0f2a6619 | 31 | #include "hyperv_vmbus.h" |
3e7ee490 | 32 | |
e3fe0bb6 S |
33 | #define NUM_PAGES_SPANNED(addr, len) \ |
34 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
35 | ||
3e189519 | 36 | /* |
fff41b2e | 37 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 38 | * channel. |
f4266e34 | 39 | */ |
fff41b2e | 40 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 41 | { |
39d70a4a | 42 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 43 | |
c50f7fb2 | 44 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 45 | /* Each u32 represents 32 channels */ |
22356585 | 46 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 47 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 48 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 49 | |
8681db44 GKH |
50 | /* Get the child to parent monitor page */ |
51 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 52 | |
22356585 | 53 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
54 | (unsigned long *)&monitorpage->trigger_group |
55 | [channel->monitor_grp].pending); | |
7c369f40 | 56 | |
f4266e34 | 57 | } else { |
21c3bef5 | 58 | vmbus_set_event(channel); |
3e7ee490 | 59 | } |
3e7ee490 HJ |
60 | } |
61 | ||
3e189519 | 62 | /* |
fff41b2e | 63 | * vmbus_get_debug_info -Retrieve various channel debug info |
f4266e34 | 64 | */ |
fff41b2e | 65 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
39d70a4a | 66 | struct vmbus_channel_debug_info *debuginfo) |
3e7ee490 | 67 | { |
39d70a4a | 68 | struct hv_monitor_page *monitorpage; |
c50f7fb2 HZ |
69 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
70 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; | |
3e7ee490 | 71 | |
8681db44 | 72 | monitorpage = vmbus_connection.monitor_pages[0]; |
c50f7fb2 | 73 | debuginfo->servermonitor_latency = |
f6feebe0 | 74 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 75 | debuginfo->servermonitor_connectionid = |
f6feebe0 HZ |
76 | monitorpage->parameter[monitor_group] |
77 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 78 | |
8681db44 | 79 | monitorpage = vmbus_connection.monitor_pages[1]; |
c50f7fb2 | 80 | debuginfo->clientmonitor_latency = |
f6feebe0 | 81 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 82 | debuginfo->clientmonitor_connectionid = |
f6feebe0 HZ |
83 | monitorpage->parameter[monitor_group] |
84 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 85 | |
a75b61d5 S |
86 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
87 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
88 | } |
89 | ||
3e189519 | 90 | /* |
fff41b2e | 91 | * vmbus_open - Open the specified channel. |
f4266e34 | 92 | */ |
fff41b2e | 93 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
94 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
95 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 96 | { |
0987ff69 | 97 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 98 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 99 | void *in, *out; |
dd0813b6 | 100 | unsigned long flags; |
9568a193 | 101 | int ret, t, err = 0; |
3e7ee490 | 102 | |
e68d2971 S |
103 | spin_lock_irqsave(&newchannel->sc_lock, flags); |
104 | if (newchannel->state == CHANNEL_OPEN_STATE) { | |
105 | newchannel->state = CHANNEL_OPENING_STATE; | |
106 | } else { | |
107 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
108 | return -EINVAL; | |
109 | } | |
110 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
111 | ||
c50f7fb2 HZ |
112 | newchannel->onchannel_callback = onchannelcallback; |
113 | newchannel->channel_callback_context = context; | |
3e7ee490 | 114 | |
454f18a9 | 115 | /* Allocate the ring buffer */ |
df3493e0 S |
116 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
117 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
118 | ||
7e052d98 BP |
119 | if (!out) |
120 | return -ENOMEM; | |
121 | ||
3e7ee490 | 122 | |
39d70a4a | 123 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 124 | |
c50f7fb2 HZ |
125 | newchannel->ringbuffer_pages = out; |
126 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 127 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 128 | |
72a95cbc S |
129 | ret = hv_ringbuffer_init( |
130 | &newchannel->outbound, out, send_ringbuffer_size); | |
131 | ||
fd4dc88e | 132 | if (ret != 0) { |
3324fb40 | 133 | err = ret; |
13925502 | 134 | goto error0; |
3324fb40 BP |
135 | } |
136 | ||
72a95cbc S |
137 | ret = hv_ringbuffer_init( |
138 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 139 | if (ret != 0) { |
3324fb40 | 140 | err = ret; |
13925502 | 141 | goto error0; |
3324fb40 | 142 | } |
3e7ee490 | 143 | |
3e7ee490 | 144 | |
454f18a9 | 145 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 146 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 147 | |
fff41b2e | 148 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 149 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
150 | send_ringbuffer_size + |
151 | recv_ringbuffer_size, | |
c50f7fb2 | 152 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 153 | |
fd4dc88e | 154 | if (ret != 0) { |
b94ef345 | 155 | err = ret; |
13925502 | 156 | goto error0; |
b94ef345 | 157 | } |
f4266e34 | 158 | |
454f18a9 | 159 | /* Create and init the channel open message */ |
176fb9e3 | 160 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
161 | sizeof(struct vmbus_channel_open_channel), |
162 | GFP_KERNEL); | |
176fb9e3 | 163 | if (!open_info) { |
c3bf2e26 | 164 | err = -ENOMEM; |
13925502 | 165 | goto error0; |
c3bf2e26 | 166 | } |
3e7ee490 | 167 | |
176fb9e3 | 168 | init_completion(&open_info->waitevent); |
3e7ee490 | 169 | |
176fb9e3 | 170 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
171 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
172 | open_msg->openid = newchannel->offermsg.child_relid; | |
173 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
174 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
175 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 176 | PAGE_SHIFT; |
abbf3b2a | 177 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 178 | |
39d70a4a | 179 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 180 | err = -EINVAL; |
13925502 | 181 | goto error0; |
c827f944 BP |
182 | } |
183 | ||
39d70a4a | 184 | if (userdatalen) |
0987ff69 | 185 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 186 | |
15b2f647 | 187 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 188 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 189 | &vmbus_connection.chn_msg_list); |
15b2f647 | 190 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 191 | |
0987ff69 | 192 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 193 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
194 | |
195 | if (ret != 0) | |
13925502 | 196 | goto error1; |
3e7ee490 | 197 | |
176fb9e3 | 198 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 199 | if (t == 0) { |
0c3b7b2f | 200 | err = -ETIMEDOUT; |
13925502 | 201 | goto error1; |
0c3b7b2f S |
202 | } |
203 | ||
3e7ee490 | 204 | |
176fb9e3 S |
205 | if (open_info->response.open_result.status) |
206 | err = open_info->response.open_result.status; | |
3e7ee490 | 207 | |
15b2f647 | 208 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 209 | list_del(&open_info->msglistentry); |
15b2f647 | 210 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 211 | |
e68d2971 S |
212 | if (err == 0) |
213 | newchannel->state = CHANNEL_OPENED_STATE; | |
214 | ||
176fb9e3 | 215 | kfree(open_info); |
98e08702 | 216 | return err; |
c3bf2e26 | 217 | |
13925502 S |
218 | error1: |
219 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
220 | list_del(&open_info->msglistentry); | |
221 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
222 | ||
223 | error0: | |
df3493e0 S |
224 | free_pages((unsigned long)out, |
225 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 226 | kfree(open_info); |
c3bf2e26 | 227 | return err; |
3e7ee490 | 228 | } |
36ceadfc | 229 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 230 | |
3e189519 | 231 | /* |
fff41b2e | 232 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 233 | */ |
fff41b2e | 234 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
235 | struct vmbus_channel_msginfo **msginfo, |
236 | u32 *messagecount) | |
3e7ee490 HJ |
237 | { |
238 | int i; | |
39d70a4a | 239 | int pagecount; |
f4266e34 | 240 | unsigned long long pfn; |
39d70a4a HZ |
241 | struct vmbus_channel_gpadl_header *gpadl_header; |
242 | struct vmbus_channel_gpadl_body *gpadl_body; | |
243 | struct vmbus_channel_msginfo *msgheader; | |
244 | struct vmbus_channel_msginfo *msgbody = NULL; | |
245 | u32 msgsize; | |
3e7ee490 | 246 | |
39d70a4a | 247 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 248 | |
39d70a4a HZ |
249 | pagecount = size >> PAGE_SHIFT; |
250 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 251 | |
454f18a9 | 252 | /* do we need a gpadl body msg */ |
39d70a4a | 253 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
254 | sizeof(struct vmbus_channel_gpadl_header) - |
255 | sizeof(struct gpa_range); | |
39d70a4a | 256 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 257 | |
39d70a4a | 258 | if (pagecount > pfncount) { |
f4266e34 | 259 | /* we need a gpadl body */ |
454f18a9 | 260 | /* fill in the header */ |
39d70a4a | 261 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 262 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
263 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
264 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
265 | if (!msgheader) | |
d1c250bb | 266 | goto nomem; |
3e7ee490 | 267 | |
c50f7fb2 HZ |
268 | INIT_LIST_HEAD(&msgheader->submsglist); |
269 | msgheader->msgsize = msgsize; | |
3e7ee490 | 270 | |
39d70a4a | 271 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
272 | msgheader->msg; |
273 | gpadl_header->rangecount = 1; | |
274 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 275 | pagecount * sizeof(u64); |
415f2287 HZ |
276 | gpadl_header->range[0].byte_offset = 0; |
277 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 278 | for (i = 0; i < pfncount; i++) |
415f2287 | 279 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
280 | *msginfo = msgheader; |
281 | *messagecount = 1; | |
3e7ee490 | 282 | |
39d70a4a HZ |
283 | pfnsum = pfncount; |
284 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 285 | |
454f18a9 | 286 | /* how many pfns can we fit */ |
39d70a4a | 287 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 288 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 289 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 290 | |
454f18a9 | 291 | /* fill in the body */ |
39d70a4a HZ |
292 | while (pfnleft) { |
293 | if (pfnleft > pfncount) | |
294 | pfncurr = pfncount; | |
3e7ee490 | 295 | else |
39d70a4a | 296 | pfncurr = pfnleft; |
3e7ee490 | 297 | |
39d70a4a | 298 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 299 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
300 | pfncurr * sizeof(u64); |
301 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
302 | |
303 | if (!msgbody) { | |
304 | struct vmbus_channel_msginfo *pos = NULL; | |
305 | struct vmbus_channel_msginfo *tmp = NULL; | |
306 | /* | |
307 | * Free up all the allocated messages. | |
308 | */ | |
309 | list_for_each_entry_safe(pos, tmp, | |
310 | &msgheader->submsglist, | |
311 | msglistentry) { | |
312 | ||
313 | list_del(&pos->msglistentry); | |
314 | kfree(pos); | |
315 | } | |
316 | ||
d1c250bb | 317 | goto nomem; |
f38cf9cc S |
318 | } |
319 | ||
c50f7fb2 | 320 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
321 | (*messagecount)++; |
322 | gpadl_body = | |
c50f7fb2 | 323 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
324 | |
325 | /* | |
f4266e34 GKH |
326 | * Gpadl is u32 and we are using a pointer which could |
327 | * be 64-bit | |
f27df643 S |
328 | * This is governed by the guest/host protocol and |
329 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 330 | */ |
39d70a4a | 331 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 332 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 333 | |
454f18a9 | 334 | /* add to msg header */ |
c50f7fb2 HZ |
335 | list_add_tail(&msgbody->msglistentry, |
336 | &msgheader->submsglist); | |
39d70a4a HZ |
337 | pfnsum += pfncurr; |
338 | pfnleft -= pfncurr; | |
3e7ee490 | 339 | } |
f4266e34 | 340 | } else { |
454f18a9 | 341 | /* everything fits in a header */ |
39d70a4a | 342 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 343 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
344 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
345 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
346 | if (msgheader == NULL) | |
e3eb7cdd | 347 | goto nomem; |
c50f7fb2 | 348 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
349 | |
350 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
351 | msgheader->msg; |
352 | gpadl_header->rangecount = 1; | |
353 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 354 | pagecount * sizeof(u64); |
415f2287 HZ |
355 | gpadl_header->range[0].byte_offset = 0; |
356 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 357 | for (i = 0; i < pagecount; i++) |
415f2287 | 358 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
359 | |
360 | *msginfo = msgheader; | |
361 | *messagecount = 1; | |
3e7ee490 HJ |
362 | } |
363 | ||
364 | return 0; | |
d1c250bb | 365 | nomem: |
39d70a4a HZ |
366 | kfree(msgheader); |
367 | kfree(msgbody); | |
d1c250bb | 368 | return -ENOMEM; |
3e7ee490 HJ |
369 | } |
370 | ||
3e189519 | 371 | /* |
fff41b2e | 372 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 373 | * |
39d70a4a HZ |
374 | * @channel: a channel |
375 | * @kbuffer: from kmalloc | |
376 | * @size: page-size multiple | |
377 | * @gpadl_handle: some funky thing | |
f4266e34 | 378 | */ |
fff41b2e | 379 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 380 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 381 | { |
39d70a4a HZ |
382 | struct vmbus_channel_gpadl_header *gpadlmsg; |
383 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
384 | struct vmbus_channel_msginfo *msginfo = NULL; |
385 | struct vmbus_channel_msginfo *submsginfo; | |
386 | u32 msgcount; | |
53af545b | 387 | struct list_head *curr; |
39d70a4a | 388 | u32 next_gpadl_handle; |
dd0813b6 | 389 | unsigned long flags; |
c3bf2e26 | 390 | int ret = 0; |
9568a193 | 391 | int t; |
3e7ee490 | 392 | |
da9fcb72 HZ |
393 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
394 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 395 | |
fff41b2e | 396 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
397 | if (ret) |
398 | return ret; | |
3e7ee490 | 399 | |
9568a193 | 400 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 401 | |
c50f7fb2 HZ |
402 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
403 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
404 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
405 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 406 | |
3e7ee490 | 407 | |
15b2f647 | 408 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 409 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 410 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 411 | |
15b2f647 | 412 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 413 | |
c6977677 | 414 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 415 | sizeof(*msginfo)); |
98e08702 | 416 | if (ret != 0) |
00d760b0 | 417 | goto cleanup; |
3e7ee490 | 418 | |
39d70a4a | 419 | if (msgcount > 1) { |
c50f7fb2 | 420 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 421 | |
39d70a4a HZ |
422 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
423 | gpadl_body = | |
c50f7fb2 | 424 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 425 | |
c50f7fb2 HZ |
426 | gpadl_body->header.msgtype = |
427 | CHANNELMSG_GPADL_BODY; | |
428 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 429 | |
c6977677 | 430 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 431 | submsginfo->msgsize - |
39d70a4a | 432 | sizeof(*submsginfo)); |
fd4dc88e | 433 | if (ret != 0) |
00d760b0 | 434 | goto cleanup; |
99259159 | 435 | |
3e7ee490 HJ |
436 | } |
437 | } | |
40961de3 | 438 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 439 | BUG_ON(t == 0); |
0c3b7b2f | 440 | |
3e7ee490 | 441 | |
454f18a9 | 442 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 443 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 444 | |
00d760b0 | 445 | cleanup: |
15b2f647 | 446 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 447 | list_del(&msginfo->msglistentry); |
15b2f647 | 448 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 449 | |
39d70a4a | 450 | kfree(msginfo); |
3e7ee490 HJ |
451 | return ret; |
452 | } | |
98873724 | 453 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 454 | |
3e189519 | 455 | /* |
fff41b2e | 456 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 457 | */ |
fff41b2e | 458 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 459 | { |
82250213 | 460 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 461 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 462 | unsigned long flags; |
9568a193 | 463 | int ret, t; |
3e7ee490 | 464 | |
f4266e34 GKH |
465 | info = kmalloc(sizeof(*info) + |
466 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
467 | if (!info) |
468 | return -ENOMEM; | |
3e7ee490 | 469 | |
9568a193 | 470 | init_completion(&info->waitevent); |
3e7ee490 | 471 | |
c50f7fb2 | 472 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 473 | |
c50f7fb2 HZ |
474 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
475 | msg->child_relid = channel->offermsg.child_relid; | |
476 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 477 | |
15b2f647 | 478 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 479 | list_add_tail(&info->msglistentry, |
da9fcb72 | 480 | &vmbus_connection.chn_msg_list); |
15b2f647 | 481 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 482 | ret = vmbus_post_msg(msg, |
f4266e34 | 483 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 484 | |
0c3b7b2f | 485 | BUG_ON(ret != 0); |
40961de3 | 486 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 487 | BUG_ON(t == 0); |
3e7ee490 | 488 | |
454f18a9 | 489 | /* Received a torndown response */ |
15b2f647 | 490 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 491 | list_del(&info->msglistentry); |
15b2f647 | 492 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 493 | |
8c69f52a | 494 | kfree(info); |
3e7ee490 HJ |
495 | return ret; |
496 | } | |
18726d7a | 497 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 498 | |
e68d2971 | 499 | static void vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 500 | { |
82250213 | 501 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 502 | int ret; |
dad76bf7 | 503 | unsigned long flags; |
3e7ee490 | 504 | |
e68d2971 S |
505 | channel->state = CHANNEL_OPEN_STATE; |
506 | channel->sc_creation_callback = NULL; | |
454f18a9 | 507 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 508 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 509 | channel->onchannel_callback = NULL; |
dad76bf7 | 510 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 511 | |
454f18a9 | 512 | /* Send a closing message */ |
3e7ee490 | 513 | |
e9a27a9f | 514 | msg = &channel->close_msg.msg; |
3e7ee490 | 515 | |
c50f7fb2 HZ |
516 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
517 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 518 | |
c6977677 | 519 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 520 | |
0c3b7b2f | 521 | BUG_ON(ret != 0); |
454f18a9 | 522 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 523 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 524 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 525 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 526 | |
454f18a9 | 527 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
528 | hv_ringbuffer_cleanup(&channel->outbound); |
529 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 530 | |
df3493e0 S |
531 | free_pages((unsigned long)channel->ringbuffer_pages, |
532 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 533 | |
3e7ee490 | 534 | |
3e7ee490 | 535 | } |
e68d2971 S |
536 | |
537 | /* | |
538 | * vmbus_close - Close the specified channel | |
539 | */ | |
540 | void vmbus_close(struct vmbus_channel *channel) | |
541 | { | |
542 | struct list_head *cur, *tmp; | |
543 | struct vmbus_channel *cur_channel; | |
544 | ||
545 | if (channel->primary_channel != NULL) { | |
546 | /* | |
547 | * We will only close sub-channels when | |
548 | * the primary is closed. | |
549 | */ | |
550 | return; | |
551 | } | |
552 | /* | |
553 | * Close all the sub-channels first and then close the | |
554 | * primary channel. | |
555 | */ | |
556 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
557 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
558 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
559 | continue; | |
560 | vmbus_close_internal(cur_channel); | |
561 | } | |
562 | /* | |
563 | * Now close the primary. | |
564 | */ | |
565 | vmbus_close_internal(channel); | |
566 | } | |
70bfa307 | 567 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 568 | |
c88c4e4c | 569 | /** |
fff41b2e | 570 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
571 | * @channel: Pointer to vmbus_channel structure. |
572 | * @buffer: Pointer to the buffer you want to receive the data into. | |
573 | * @bufferlen: Maximum size of what the the buffer will hold | |
574 | * @requestid: Identifier of the request | |
575 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
576 | * packet etc. |
577 | * | |
39d70a4a | 578 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
579 | * This will send the data unparsed to hyper-v. |
580 | * | |
581 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 582 | */ |
fff41b2e | 583 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
584 | u32 bufferlen, u64 requestid, |
585 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 586 | { |
8dc0a06a | 587 | struct vmpacket_descriptor desc; |
39d70a4a | 588 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 589 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
590 | struct scatterlist bufferlist[3]; |
591 | u64 aligned_data = 0; | |
f4266e34 | 592 | int ret; |
98fa8cf4 | 593 | bool signal = false; |
3e7ee490 | 594 | |
3e7ee490 | 595 | |
454f18a9 | 596 | /* Setup the descriptor */ |
415f2287 HZ |
597 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
598 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 599 | /* in 8-bytes granularity */ |
415f2287 HZ |
600 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
601 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
602 | desc.trans_id = requestid; | |
3e7ee490 | 603 | |
39d70a4a HZ |
604 | sg_init_table(bufferlist, 3); |
605 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
606 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
607 | sg_set_buf(&bufferlist[2], &aligned_data, | |
608 | packetlen_aligned - packetlen); | |
3e7ee490 | 609 | |
98fa8cf4 | 610 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 611 | |
98fa8cf4 | 612 | if (ret == 0 && signal) |
fff41b2e | 613 | vmbus_setevent(channel); |
3e7ee490 | 614 | |
3e7ee490 HJ |
615 | return ret; |
616 | } | |
fff41b2e | 617 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 618 | |
3e189519 | 619 | /* |
fff41b2e | 620 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 621 | * packets using a GPADL Direct packet type. |
f4266e34 | 622 | */ |
fff41b2e | 623 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
624 | struct hv_page_buffer pagebuffers[], |
625 | u32 pagecount, void *buffer, u32 bufferlen, | |
626 | u64 requestid) | |
3e7ee490 | 627 | { |
f4266e34 GKH |
628 | int ret; |
629 | int i; | |
430a8e9a | 630 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
631 | u32 descsize; |
632 | u32 packetlen; | |
633 | u32 packetlen_aligned; | |
634 | struct scatterlist bufferlist[3]; | |
635 | u64 aligned_data = 0; | |
98fa8cf4 | 636 | bool signal = false; |
3e7ee490 | 637 | |
39d70a4a | 638 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 639 | return -EINVAL; |
3e7ee490 | 640 | |
3e7ee490 | 641 | |
f4266e34 | 642 | /* |
430a8e9a | 643 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
644 | * largest size we support |
645 | */ | |
39d70a4a HZ |
646 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
647 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 648 | sizeof(struct hv_page_buffer)); |
39d70a4a | 649 | packetlen = descsize + bufferlen; |
73509681 | 650 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 651 | |
454f18a9 | 652 | /* Setup the descriptor */ |
415f2287 | 653 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 654 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
655 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
656 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
657 | desc.transactionid = requestid; | |
658 | desc.rangecount = pagecount; | |
659 | ||
660 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
661 | desc.range[i].len = pagebuffers[i].len; |
662 | desc.range[i].offset = pagebuffers[i].offset; | |
663 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
664 | } |
665 | ||
39d70a4a HZ |
666 | sg_init_table(bufferlist, 3); |
667 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
668 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
669 | sg_set_buf(&bufferlist[2], &aligned_data, | |
670 | packetlen_aligned - packetlen); | |
3e7ee490 | 671 | |
98fa8cf4 | 672 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 673 | |
98fa8cf4 | 674 | if (ret == 0 && signal) |
fff41b2e | 675 | vmbus_setevent(channel); |
3e7ee490 | 676 | |
3e7ee490 HJ |
677 | return ret; |
678 | } | |
713efeb4 | 679 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 680 | |
3e189519 | 681 | /* |
fff41b2e | 682 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 683 | * using a GPADL Direct packet type. |
f4266e34 | 684 | */ |
fff41b2e | 685 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
686 | struct hv_multipage_buffer *multi_pagebuffer, |
687 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 688 | { |
f4266e34 | 689 | int ret; |
430a8e9a | 690 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
691 | u32 descsize; |
692 | u32 packetlen; | |
693 | u32 packetlen_aligned; | |
694 | struct scatterlist bufferlist[3]; | |
695 | u64 aligned_data = 0; | |
98fa8cf4 | 696 | bool signal = false; |
ca623ad3 HZ |
697 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
698 | multi_pagebuffer->len); | |
3e7ee490 | 699 | |
3e7ee490 | 700 | |
39d70a4a | 701 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 702 | return -EINVAL; |
3e7ee490 | 703 | |
f4266e34 | 704 | /* |
430a8e9a | 705 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
706 | * the largest size we support |
707 | */ | |
39d70a4a HZ |
708 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
709 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 710 | sizeof(u64)); |
39d70a4a | 711 | packetlen = descsize + bufferlen; |
73509681 | 712 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 713 | |
3e7ee490 | 714 | |
454f18a9 | 715 | /* Setup the descriptor */ |
415f2287 | 716 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 717 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
718 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
719 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
720 | desc.transactionid = requestid; | |
430a8e9a | 721 | desc.rangecount = 1; |
3e7ee490 | 722 | |
ca623ad3 HZ |
723 | desc.range.len = multi_pagebuffer->len; |
724 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 725 | |
ca623ad3 | 726 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 727 | pfncount * sizeof(u64)); |
3e7ee490 | 728 | |
39d70a4a HZ |
729 | sg_init_table(bufferlist, 3); |
730 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
731 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
732 | sg_set_buf(&bufferlist[2], &aligned_data, | |
733 | packetlen_aligned - packetlen); | |
3e7ee490 | 734 | |
98fa8cf4 | 735 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 736 | |
98fa8cf4 | 737 | if (ret == 0 && signal) |
fff41b2e | 738 | vmbus_setevent(channel); |
3e7ee490 | 739 | |
3e7ee490 HJ |
740 | return ret; |
741 | } | |
4cb106fa | 742 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
743 | |
744 | /** | |
fff41b2e | 745 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
746 | * @channel: Pointer to vmbus_channel structure. |
747 | * @buffer: Pointer to the buffer you want to receive the data into. | |
748 | * @bufferlen: Maximum size of what the the buffer will hold | |
749 | * @buffer_actual_len: The actual size of the data after it was received | |
750 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
751 | * |
752 | * Receives directly from the hyper-v vmbus and puts the data it received | |
753 | * into Buffer. This will receive the data unparsed from hyper-v. | |
754 | * | |
755 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 756 | */ |
fff41b2e | 757 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 758 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 759 | { |
8dc0a06a | 760 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
761 | u32 packetlen; |
762 | u32 userlen; | |
3e7ee490 | 763 | int ret; |
c2b8e520 | 764 | bool signal = false; |
3e7ee490 | 765 | |
39d70a4a HZ |
766 | *buffer_actual_len = 0; |
767 | *requestid = 0; | |
3e7ee490 | 768 | |
3e7ee490 | 769 | |
a89186c2 | 770 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 771 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 772 | if (ret != 0) |
3e7ee490 | 773 | return 0; |
3e7ee490 | 774 | |
415f2287 HZ |
775 | packetlen = desc.len8 << 3; |
776 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 777 | |
39d70a4a | 778 | *buffer_actual_len = userlen; |
3e7ee490 | 779 | |
39d70a4a | 780 | if (userlen > bufferlen) { |
3e7ee490 | 781 | |
0a46618d | 782 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 783 | bufferlen, userlen); |
926ae526 | 784 | return -ETOOSMALL; |
3e7ee490 HJ |
785 | } |
786 | ||
415f2287 | 787 | *requestid = desc.trans_id; |
3e7ee490 | 788 | |
454f18a9 | 789 | /* Copy over the packet to the user buffer */ |
38397c8a | 790 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 791 | (desc.offset8 << 3), &signal); |
3e7ee490 | 792 | |
c2b8e520 S |
793 | if (signal) |
794 | vmbus_setevent(channel); | |
3e7ee490 | 795 | |
3e7ee490 HJ |
796 | return 0; |
797 | } | |
fff41b2e | 798 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 799 | |
3e189519 | 800 | /* |
fff41b2e | 801 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 802 | */ |
fff41b2e | 803 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
804 | u32 bufferlen, u32 *buffer_actual_len, |
805 | u64 *requestid) | |
3e7ee490 | 806 | { |
8dc0a06a | 807 | struct vmpacket_descriptor desc; |
39d70a4a | 808 | u32 packetlen; |
3e7ee490 | 809 | int ret; |
c2b8e520 | 810 | bool signal = false; |
3e7ee490 | 811 | |
39d70a4a HZ |
812 | *buffer_actual_len = 0; |
813 | *requestid = 0; | |
3e7ee490 | 814 | |
3e7ee490 | 815 | |
a89186c2 | 816 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 817 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 818 | if (ret != 0) |
3e7ee490 | 819 | return 0; |
3e7ee490 | 820 | |
3e7ee490 | 821 | |
415f2287 | 822 | packetlen = desc.len8 << 3; |
3e7ee490 | 823 | |
39d70a4a | 824 | *buffer_actual_len = packetlen; |
3e7ee490 | 825 | |
39d70a4a | 826 | if (packetlen > bufferlen) { |
0a46618d HJ |
827 | pr_err("Buffer too small - needed %d bytes but " |
828 | "got space for only %d bytes\n", | |
829 | packetlen, bufferlen); | |
3d5cad97 | 830 | return -ENOBUFS; |
3e7ee490 HJ |
831 | } |
832 | ||
415f2287 | 833 | *requestid = desc.trans_id; |
3e7ee490 | 834 | |
454f18a9 | 835 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
836 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
837 | &signal); | |
838 | ||
839 | if (signal) | |
840 | vmbus_setevent(channel); | |
3e7ee490 | 841 | |
3e7ee490 HJ |
842 | return 0; |
843 | } | |
adaee6bd | 844 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |