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Commit | Line | Data |
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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> |
011a7c3c | 30 | #include <linux/uio.h> |
63d55b2a | 31 | #include <linux/interrupt.h> |
3f335ea2 | 32 | |
0f2a6619 | 33 | #include "hyperv_vmbus.h" |
3e7ee490 | 34 | |
e3fe0bb6 S |
35 | #define NUM_PAGES_SPANNED(addr, len) \ |
36 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
37 | ||
3e189519 | 38 | /* |
fff41b2e | 39 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 40 | * channel. |
f4266e34 | 41 | */ |
1f6ee4e7 | 42 | void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 43 | { |
39d70a4a | 44 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 45 | |
991f8f1c VK |
46 | trace_vmbus_setevent(channel); |
47 | ||
3724287c S |
48 | /* |
49 | * For channels marked as in "low latency" mode | |
50 | * bypass the monitor page mechanism. | |
51 | */ | |
5c1bec61 SH |
52 | if (channel->offermsg.monitor_allocated && !channel->low_latency) { |
53 | vmbus_send_interrupt(channel->offermsg.child_relid); | |
3e7ee490 | 54 | |
8681db44 GKH |
55 | /* Get the child to parent monitor page */ |
56 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 57 | |
22356585 | 58 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
59 | (unsigned long *)&monitorpage->trigger_group |
60 | [channel->monitor_grp].pending); | |
7c369f40 | 61 | |
f4266e34 | 62 | } else { |
21c3bef5 | 63 | vmbus_set_event(channel); |
3e7ee490 | 64 | } |
3e7ee490 | 65 | } |
1f6ee4e7 | 66 | EXPORT_SYMBOL_GPL(vmbus_setevent); |
3e7ee490 | 67 | |
3e189519 | 68 | /* |
fff41b2e | 69 | * vmbus_open - Open the specified channel. |
f4266e34 | 70 | */ |
fff41b2e | 71 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
72 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
73 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 74 | { |
0987ff69 | 75 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 76 | struct vmbus_channel_msginfo *open_info = NULL; |
dd0813b6 | 77 | unsigned long flags; |
08a9513f | 78 | int ret, err = 0; |
294409d2 | 79 | struct page *page; |
3e7ee490 | 80 | |
98f531b1 VK |
81 | if (send_ringbuffer_size % PAGE_SIZE || |
82 | recv_ringbuffer_size % PAGE_SIZE) | |
83 | return -EINVAL; | |
84 | ||
67fae053 | 85 | spin_lock_irqsave(&newchannel->lock, flags); |
e68d2971 S |
86 | if (newchannel->state == CHANNEL_OPEN_STATE) { |
87 | newchannel->state = CHANNEL_OPENING_STATE; | |
88 | } else { | |
67fae053 | 89 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 S |
90 | return -EINVAL; |
91 | } | |
67fae053 | 92 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 | 93 | |
c50f7fb2 HZ |
94 | newchannel->onchannel_callback = onchannelcallback; |
95 | newchannel->channel_callback_context = context; | |
3e7ee490 | 96 | |
454f18a9 | 97 | /* Allocate the ring buffer */ |
294409d2 S |
98 | page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), |
99 | GFP_KERNEL|__GFP_ZERO, | |
100 | get_order(send_ringbuffer_size + | |
101 | recv_ringbuffer_size)); | |
102 | ||
103 | if (!page) | |
98f531b1 VK |
104 | page = alloc_pages(GFP_KERNEL|__GFP_ZERO, |
105 | get_order(send_ringbuffer_size + | |
106 | recv_ringbuffer_size)); | |
df3493e0 | 107 | |
98f531b1 | 108 | if (!page) { |
ac0d12b7 | 109 | err = -ENOMEM; |
98f531b1 | 110 | goto error_set_chnstate; |
ac0d12b7 | 111 | } |
3e7ee490 | 112 | |
9988ce68 | 113 | newchannel->ringbuffer_pages = page_address(page); |
c50f7fb2 | 114 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + |
39d70a4a | 115 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 116 | |
9988ce68 VK |
117 | ret = hv_ringbuffer_init(&newchannel->outbound, page, |
118 | send_ringbuffer_size >> PAGE_SHIFT); | |
72a95cbc | 119 | |
fd4dc88e | 120 | if (ret != 0) { |
3324fb40 | 121 | err = ret; |
98f531b1 | 122 | goto error_free_pages; |
3324fb40 BP |
123 | } |
124 | ||
9988ce68 VK |
125 | ret = hv_ringbuffer_init(&newchannel->inbound, |
126 | &page[send_ringbuffer_size >> PAGE_SHIFT], | |
127 | recv_ringbuffer_size >> PAGE_SHIFT); | |
fd4dc88e | 128 | if (ret != 0) { |
3324fb40 | 129 | err = ret; |
98f531b1 | 130 | goto error_free_pages; |
3324fb40 | 131 | } |
3e7ee490 | 132 | |
3e7ee490 | 133 | |
454f18a9 | 134 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 135 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 136 | |
fff41b2e | 137 | ret = vmbus_establish_gpadl(newchannel, |
9988ce68 VK |
138 | page_address(page), |
139 | send_ringbuffer_size + | |
140 | recv_ringbuffer_size, | |
141 | &newchannel->ringbuffer_gpadlhandle); | |
b94ef345 | 142 | |
fd4dc88e | 143 | if (ret != 0) { |
b94ef345 | 144 | err = ret; |
98f531b1 | 145 | goto error_free_pages; |
b94ef345 | 146 | } |
f4266e34 | 147 | |
454f18a9 | 148 | /* Create and init the channel open message */ |
176fb9e3 | 149 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
150 | sizeof(struct vmbus_channel_open_channel), |
151 | GFP_KERNEL); | |
176fb9e3 | 152 | if (!open_info) { |
c3bf2e26 | 153 | err = -ENOMEM; |
98f531b1 | 154 | goto error_free_gpadl; |
c3bf2e26 | 155 | } |
3e7ee490 | 156 | |
176fb9e3 | 157 | init_completion(&open_info->waitevent); |
ccb61f8a | 158 | open_info->waiting_channel = newchannel; |
3e7ee490 | 159 | |
176fb9e3 | 160 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
161 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
162 | open_msg->openid = newchannel->offermsg.child_relid; | |
163 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
164 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
165 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 166 | PAGE_SHIFT; |
abbf3b2a | 167 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 168 | |
39d70a4a | 169 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 170 | err = -EINVAL; |
98f531b1 | 171 | goto error_free_gpadl; |
c827f944 BP |
172 | } |
173 | ||
39d70a4a | 174 | if (userdatalen) |
0987ff69 | 175 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 176 | |
15b2f647 | 177 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 178 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 179 | &vmbus_connection.chn_msg_list); |
15b2f647 | 180 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 181 | |
6f3d791f S |
182 | if (newchannel->rescind) { |
183 | err = -ENODEV; | |
184 | goto error_free_gpadl; | |
185 | } | |
186 | ||
0987ff69 | 187 | ret = vmbus_post_msg(open_msg, |
c0bb0392 | 188 | sizeof(struct vmbus_channel_open_channel), true); |
98e08702 | 189 | |
9202d771 VK |
190 | trace_vmbus_open(open_msg, ret); |
191 | ||
45d727ce S |
192 | if (ret != 0) { |
193 | err = ret; | |
98f531b1 | 194 | goto error_clean_msglist; |
45d727ce | 195 | } |
3e7ee490 | 196 | |
396e287f | 197 | wait_for_completion(&open_info->waitevent); |
0c3b7b2f | 198 | |
15b2f647 | 199 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 200 | list_del(&open_info->msglistentry); |
15b2f647 | 201 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 202 | |
ccb61f8a S |
203 | if (newchannel->rescind) { |
204 | err = -ENODEV; | |
205 | goto error_free_gpadl; | |
206 | } | |
207 | ||
ffc151f3 VK |
208 | if (open_info->response.open_result.status) { |
209 | err = -EAGAIN; | |
98f531b1 | 210 | goto error_free_gpadl; |
ffc151f3 | 211 | } |
e68d2971 | 212 | |
ffc151f3 | 213 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 214 | kfree(open_info); |
ffc151f3 | 215 | return 0; |
c3bf2e26 | 216 | |
98f531b1 | 217 | error_clean_msglist: |
13925502 S |
218 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
219 | list_del(&open_info->msglistentry); | |
220 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
221 | ||
98f531b1 | 222 | error_free_gpadl: |
40384e4b | 223 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); |
98f531b1 VK |
224 | kfree(open_info); |
225 | error_free_pages: | |
9988ce68 VK |
226 | hv_ringbuffer_cleanup(&newchannel->outbound); |
227 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
228 | __free_pages(page, | |
229 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
98f531b1 | 230 | error_set_chnstate: |
ac0d12b7 | 231 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 232 | return err; |
3e7ee490 | 233 | } |
36ceadfc | 234 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 235 | |
5c23a1a5 DC |
236 | /* Used for Hyper-V Socket: a guest client's connect() to the host */ |
237 | int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id, | |
238 | const uuid_le *shv_host_servie_id) | |
239 | { | |
240 | struct vmbus_channel_tl_connect_request conn_msg; | |
98f31a00 | 241 | int ret; |
5c23a1a5 DC |
242 | |
243 | memset(&conn_msg, 0, sizeof(conn_msg)); | |
244 | conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST; | |
245 | conn_msg.guest_endpoint_id = *shv_guest_servie_id; | |
246 | conn_msg.host_service_id = *shv_host_servie_id; | |
247 | ||
98f31a00 VK |
248 | ret = vmbus_post_msg(&conn_msg, sizeof(conn_msg), true); |
249 | ||
250 | trace_vmbus_send_tl_connect_request(&conn_msg, ret); | |
251 | ||
252 | return ret; | |
5c23a1a5 DC |
253 | } |
254 | EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request); | |
255 | ||
3e189519 | 256 | /* |
fff41b2e | 257 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 258 | */ |
fff41b2e | 259 | static int create_gpadl_header(void *kbuffer, u32 size, |
4d637632 | 260 | struct vmbus_channel_msginfo **msginfo) |
3e7ee490 HJ |
261 | { |
262 | int i; | |
39d70a4a | 263 | int pagecount; |
39d70a4a HZ |
264 | struct vmbus_channel_gpadl_header *gpadl_header; |
265 | struct vmbus_channel_gpadl_body *gpadl_body; | |
266 | struct vmbus_channel_msginfo *msgheader; | |
267 | struct vmbus_channel_msginfo *msgbody = NULL; | |
268 | u32 msgsize; | |
3e7ee490 | 269 | |
39d70a4a | 270 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 271 | |
39d70a4a | 272 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 273 | |
454f18a9 | 274 | /* do we need a gpadl body msg */ |
39d70a4a | 275 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
276 | sizeof(struct vmbus_channel_gpadl_header) - |
277 | sizeof(struct gpa_range); | |
39d70a4a | 278 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 279 | |
39d70a4a | 280 | if (pagecount > pfncount) { |
f4266e34 | 281 | /* we need a gpadl body */ |
454f18a9 | 282 | /* fill in the header */ |
39d70a4a | 283 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 284 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
285 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
286 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
287 | if (!msgheader) | |
d1c250bb | 288 | goto nomem; |
3e7ee490 | 289 | |
c50f7fb2 HZ |
290 | INIT_LIST_HEAD(&msgheader->submsglist); |
291 | msgheader->msgsize = msgsize; | |
3e7ee490 | 292 | |
39d70a4a | 293 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
294 | msgheader->msg; |
295 | gpadl_header->rangecount = 1; | |
296 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 297 | pagecount * sizeof(u64); |
415f2287 HZ |
298 | gpadl_header->range[0].byte_offset = 0; |
299 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 300 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
301 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
302 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a | 303 | *msginfo = msgheader; |
3e7ee490 | 304 | |
39d70a4a HZ |
305 | pfnsum = pfncount; |
306 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 307 | |
454f18a9 | 308 | /* how many pfns can we fit */ |
39d70a4a | 309 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 310 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 311 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 312 | |
454f18a9 | 313 | /* fill in the body */ |
39d70a4a HZ |
314 | while (pfnleft) { |
315 | if (pfnleft > pfncount) | |
316 | pfncurr = pfncount; | |
3e7ee490 | 317 | else |
39d70a4a | 318 | pfncurr = pfnleft; |
3e7ee490 | 319 | |
39d70a4a | 320 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 321 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
322 | pfncurr * sizeof(u64); |
323 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
324 | |
325 | if (!msgbody) { | |
326 | struct vmbus_channel_msginfo *pos = NULL; | |
327 | struct vmbus_channel_msginfo *tmp = NULL; | |
328 | /* | |
329 | * Free up all the allocated messages. | |
330 | */ | |
331 | list_for_each_entry_safe(pos, tmp, | |
332 | &msgheader->submsglist, | |
333 | msglistentry) { | |
334 | ||
335 | list_del(&pos->msglistentry); | |
336 | kfree(pos); | |
337 | } | |
338 | ||
d1c250bb | 339 | goto nomem; |
f38cf9cc S |
340 | } |
341 | ||
c50f7fb2 | 342 | msgbody->msgsize = msgsize; |
39d70a4a | 343 | gpadl_body = |
c50f7fb2 | 344 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
345 | |
346 | /* | |
f4266e34 GKH |
347 | * Gpadl is u32 and we are using a pointer which could |
348 | * be 64-bit | |
f27df643 | 349 | * This is governed by the guest/host protocol and |
bdc1dd47 | 350 | * so the hypervisor guarantees that this is ok. |
f4266e34 | 351 | */ |
39d70a4a | 352 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
353 | gpadl_body->pfn[i] = slow_virt_to_phys( |
354 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
355 | PAGE_SHIFT; | |
3e7ee490 | 356 | |
454f18a9 | 357 | /* add to msg header */ |
c50f7fb2 HZ |
358 | list_add_tail(&msgbody->msglistentry, |
359 | &msgheader->submsglist); | |
39d70a4a HZ |
360 | pfnsum += pfncurr; |
361 | pfnleft -= pfncurr; | |
3e7ee490 | 362 | } |
f4266e34 | 363 | } else { |
454f18a9 | 364 | /* everything fits in a header */ |
39d70a4a | 365 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 366 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
367 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
368 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
369 | if (msgheader == NULL) | |
e3eb7cdd | 370 | goto nomem; |
4d637632 VK |
371 | |
372 | INIT_LIST_HEAD(&msgheader->submsglist); | |
c50f7fb2 | 373 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
374 | |
375 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
376 | msgheader->msg; |
377 | gpadl_header->rangecount = 1; | |
378 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 379 | pagecount * sizeof(u64); |
415f2287 HZ |
380 | gpadl_header->range[0].byte_offset = 0; |
381 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 382 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
383 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
384 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
385 | |
386 | *msginfo = msgheader; | |
3e7ee490 HJ |
387 | } |
388 | ||
389 | return 0; | |
d1c250bb | 390 | nomem: |
39d70a4a HZ |
391 | kfree(msgheader); |
392 | kfree(msgbody); | |
d1c250bb | 393 | return -ENOMEM; |
3e7ee490 HJ |
394 | } |
395 | ||
3e189519 | 396 | /* |
bdc1dd47 | 397 | * vmbus_establish_gpadl - Establish a GPADL for the specified buffer |
f4266e34 | 398 | * |
39d70a4a | 399 | * @channel: a channel |
b679ef73 | 400 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
401 | * @size: page-size multiple |
402 | * @gpadl_handle: some funky thing | |
f4266e34 | 403 | */ |
fff41b2e | 404 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 405 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 406 | { |
39d70a4a HZ |
407 | struct vmbus_channel_gpadl_header *gpadlmsg; |
408 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a | 409 | struct vmbus_channel_msginfo *msginfo = NULL; |
7cc80c98 | 410 | struct vmbus_channel_msginfo *submsginfo, *tmp; |
53af545b | 411 | struct list_head *curr; |
39d70a4a | 412 | u32 next_gpadl_handle; |
dd0813b6 | 413 | unsigned long flags; |
c3bf2e26 | 414 | int ret = 0; |
3e7ee490 | 415 | |
9f52a163 S |
416 | next_gpadl_handle = |
417 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 418 | |
4d637632 | 419 | ret = create_gpadl_header(kbuffer, size, &msginfo); |
c3bf2e26 BP |
420 | if (ret) |
421 | return ret; | |
3e7ee490 | 422 | |
9568a193 | 423 | init_completion(&msginfo->waitevent); |
ccb61f8a | 424 | msginfo->waiting_channel = channel; |
c3bf2e26 | 425 | |
c50f7fb2 HZ |
426 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
427 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
428 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
429 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 430 | |
3e7ee490 | 431 | |
15b2f647 | 432 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 433 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 434 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 435 | |
15b2f647 | 436 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 437 | |
6f3d791f S |
438 | if (channel->rescind) { |
439 | ret = -ENODEV; | |
440 | goto cleanup; | |
441 | } | |
442 | ||
c6977677 | 443 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
c0bb0392 | 444 | sizeof(*msginfo), true); |
69edbd5f VK |
445 | |
446 | trace_vmbus_establish_gpadl_header(gpadlmsg, ret); | |
447 | ||
98e08702 | 448 | if (ret != 0) |
00d760b0 | 449 | goto cleanup; |
3e7ee490 | 450 | |
4d637632 VK |
451 | list_for_each(curr, &msginfo->submsglist) { |
452 | submsginfo = (struct vmbus_channel_msginfo *)curr; | |
453 | gpadl_body = | |
454 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; | |
53af545b | 455 | |
4d637632 VK |
456 | gpadl_body->header.msgtype = |
457 | CHANNELMSG_GPADL_BODY; | |
458 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 459 | |
4d637632 | 460 | ret = vmbus_post_msg(gpadl_body, |
c0bb0392 VK |
461 | submsginfo->msgsize - sizeof(*submsginfo), |
462 | true); | |
69edbd5f VK |
463 | |
464 | trace_vmbus_establish_gpadl_body(gpadl_body, ret); | |
465 | ||
4d637632 VK |
466 | if (ret != 0) |
467 | goto cleanup; | |
3e7ee490 | 468 | |
3e7ee490 | 469 | } |
72c6b71c | 470 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 471 | |
ccb61f8a S |
472 | if (channel->rescind) { |
473 | ret = -ENODEV; | |
474 | goto cleanup; | |
475 | } | |
476 | ||
454f18a9 | 477 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 478 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 479 | |
00d760b0 | 480 | cleanup: |
15b2f647 | 481 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 482 | list_del(&msginfo->msglistentry); |
15b2f647 | 483 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
7cc80c98 VK |
484 | list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist, |
485 | msglistentry) { | |
486 | kfree(submsginfo); | |
487 | } | |
3e7ee490 | 488 | |
39d70a4a | 489 | kfree(msginfo); |
3e7ee490 HJ |
490 | return ret; |
491 | } | |
98873724 | 492 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 493 | |
3e189519 | 494 | /* |
fff41b2e | 495 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 496 | */ |
fff41b2e | 497 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 498 | { |
82250213 | 499 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 500 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 501 | unsigned long flags; |
66be6530 | 502 | int ret; |
3e7ee490 | 503 | |
f4266e34 GKH |
504 | info = kmalloc(sizeof(*info) + |
505 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
506 | if (!info) |
507 | return -ENOMEM; | |
3e7ee490 | 508 | |
9568a193 | 509 | init_completion(&info->waitevent); |
ccb61f8a | 510 | info->waiting_channel = channel; |
3e7ee490 | 511 | |
c50f7fb2 | 512 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 513 | |
c50f7fb2 HZ |
514 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
515 | msg->child_relid = channel->offermsg.child_relid; | |
516 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 517 | |
15b2f647 | 518 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 519 | list_add_tail(&info->msglistentry, |
da9fcb72 | 520 | &vmbus_connection.chn_msg_list); |
15b2f647 | 521 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
6f3d791f S |
522 | |
523 | if (channel->rescind) | |
524 | goto post_msg_err; | |
525 | ||
c0bb0392 VK |
526 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_gpadl_teardown), |
527 | true); | |
3e7ee490 | 528 | |
09cdf8f8 VK |
529 | trace_vmbus_teardown_gpadl(msg, ret); |
530 | ||
66be6530 S |
531 | if (ret) |
532 | goto post_msg_err; | |
533 | ||
534 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 535 | |
66be6530 | 536 | post_msg_err: |
5e030d5c S |
537 | /* |
538 | * If the channel has been rescinded; | |
539 | * we will be awakened by the rescind | |
540 | * handler; set the error code to zero so we don't leak memory. | |
541 | */ | |
542 | if (channel->rescind) | |
543 | ret = 0; | |
544 | ||
15b2f647 | 545 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 546 | list_del(&info->msglistentry); |
15b2f647 | 547 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 548 | |
8c69f52a | 549 | kfree(info); |
3e7ee490 HJ |
550 | return ret; |
551 | } | |
18726d7a | 552 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 553 | |
d3ba720d S |
554 | static void reset_channel_cb(void *arg) |
555 | { | |
556 | struct vmbus_channel *channel = arg; | |
557 | ||
558 | channel->onchannel_callback = NULL; | |
559 | } | |
560 | ||
98d731bb | 561 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 562 | { |
82250213 | 563 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 564 | int ret; |
3e7ee490 | 565 | |
63d55b2a | 566 | /* |
dad72a1d | 567 | * vmbus_on_event(), running in the per-channel tasklet, can race |
63d55b2a DC |
568 | * with vmbus_close_internal() in the case of SMP guest, e.g., when |
569 | * the former is accessing channel->inbound.ring_buffer, the latter | |
dad72a1d DC |
570 | * could be freeing the ring_buffer pages, so here we must stop it |
571 | * first. | |
63d55b2a | 572 | */ |
dad72a1d | 573 | tasklet_disable(&channel->callback_event); |
63d55b2a | 574 | |
64b7faf9 DC |
575 | /* |
576 | * In case a device driver's probe() fails (e.g., | |
577 | * util_probe() -> vmbus_open() returns -ENOMEM) and the device is | |
8a1115ff | 578 | * rescinded later (e.g., we dynamically disable an Integrated Service |
64b7faf9 DC |
579 | * in Hyper-V Manager), the driver's remove() invokes vmbus_close(): |
580 | * here we should skip most of the below cleanup work. | |
581 | */ | |
582 | if (channel->state != CHANNEL_OPENED_STATE) { | |
583 | ret = -EINVAL; | |
584 | goto out; | |
585 | } | |
586 | ||
e68d2971 S |
587 | channel->state = CHANNEL_OPEN_STATE; |
588 | channel->sc_creation_callback = NULL; | |
454f18a9 | 589 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
590 | if (channel->target_cpu != get_cpu()) { |
591 | put_cpu(); | |
d3ba720d S |
592 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
593 | channel, true); | |
2115b561 | 594 | } else { |
d3ba720d | 595 | reset_channel_cb(channel); |
2115b561 S |
596 | put_cpu(); |
597 | } | |
3e7ee490 | 598 | |
454f18a9 | 599 | /* Send a closing message */ |
3e7ee490 | 600 | |
e9a27a9f | 601 | msg = &channel->close_msg.msg; |
3e7ee490 | 602 | |
c50f7fb2 HZ |
603 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
604 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 605 | |
c0bb0392 VK |
606 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel), |
607 | true); | |
3e7ee490 | 608 | |
633b005d VK |
609 | trace_vmbus_close_internal(msg, ret); |
610 | ||
98d731bb S |
611 | if (ret) { |
612 | pr_err("Close failed: close post msg return is %d\n", ret); | |
613 | /* | |
614 | * If we failed to post the close msg, | |
615 | * it is perhaps better to leak memory. | |
616 | */ | |
63d55b2a | 617 | goto out; |
98d731bb S |
618 | } |
619 | ||
454f18a9 | 620 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
621 | if (channel->ringbuffer_gpadlhandle) { |
622 | ret = vmbus_teardown_gpadl(channel, | |
623 | channel->ringbuffer_gpadlhandle); | |
624 | if (ret) { | |
625 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
626 | /* | |
627 | * If we failed to teardown gpadl, | |
628 | * it is perhaps better to leak memory. | |
629 | */ | |
63d55b2a | 630 | goto out; |
98d731bb S |
631 | } |
632 | } | |
3e7ee490 | 633 | |
454f18a9 | 634 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
635 | hv_ringbuffer_cleanup(&channel->outbound); |
636 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 637 | |
df3493e0 S |
638 | free_pages((unsigned long)channel->ringbuffer_pages, |
639 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 640 | |
63d55b2a | 641 | out: |
6463a457 SH |
642 | /* re-enable tasklet for use on re-open */ |
643 | tasklet_enable(&channel->callback_event); | |
98d731bb | 644 | return ret; |
3e7ee490 | 645 | } |
e68d2971 S |
646 | |
647 | /* | |
648 | * vmbus_close - Close the specified channel | |
649 | */ | |
650 | void vmbus_close(struct vmbus_channel *channel) | |
651 | { | |
652 | struct list_head *cur, *tmp; | |
653 | struct vmbus_channel *cur_channel; | |
654 | ||
655 | if (channel->primary_channel != NULL) { | |
656 | /* | |
657 | * We will only close sub-channels when | |
658 | * the primary is closed. | |
659 | */ | |
660 | return; | |
661 | } | |
192b2d78 | 662 | mutex_lock(&vmbus_connection.channel_mutex); |
e68d2971 S |
663 | /* |
664 | * Close all the sub-channels first and then close the | |
665 | * primary channel. | |
666 | */ | |
667 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
668 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
e68d2971 | 669 | vmbus_close_internal(cur_channel); |
54a66265 | 670 | if (cur_channel->rescind) { |
192b2d78 | 671 | hv_process_channel_removal( |
54a66265 | 672 | cur_channel->offermsg.child_relid); |
54a66265 | 673 | } |
e68d2971 S |
674 | } |
675 | /* | |
676 | * Now close the primary. | |
677 | */ | |
678 | vmbus_close_internal(channel); | |
192b2d78 | 679 | mutex_unlock(&vmbus_connection.channel_mutex); |
e68d2971 | 680 | } |
70bfa307 | 681 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 682 | |
5dd0fb9b | 683 | /** |
684 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
685 | * @channel: Pointer to vmbus_channel structure. | |
686 | * @buffer: Pointer to the buffer you want to receive the data into. | |
687 | * @bufferlen: Maximum size of what the the buffer will hold | |
688 | * @requestid: Identifier of the request | |
689 | * @type: Type of packet that is being send e.g. negotiate, time | |
690 | * packet etc. | |
691 | * | |
692 | * Sends data in @buffer directly to hyper-v via the vmbus | |
693 | * This will send the data unparsed to hyper-v. | |
694 | * | |
695 | * Mainly used by Hyper-V drivers. | |
696 | */ | |
697 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
698 | u32 bufferlen, u64 requestid, | |
699 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 700 | { |
8dc0a06a | 701 | struct vmpacket_descriptor desc; |
39d70a4a | 702 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 703 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 704 | struct kvec bufferlist[3]; |
39d70a4a | 705 | u64 aligned_data = 0; |
b81658cf | 706 | int num_vecs = ((bufferlen != 0) ? 3 : 1); |
3e7ee490 | 707 | |
3e7ee490 | 708 | |
454f18a9 | 709 | /* Setup the descriptor */ |
415f2287 HZ |
710 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
711 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 712 | /* in 8-bytes granularity */ |
415f2287 HZ |
713 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
714 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
715 | desc.trans_id = requestid; | |
3e7ee490 | 716 | |
011a7c3c S |
717 | bufferlist[0].iov_base = &desc; |
718 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
719 | bufferlist[1].iov_base = buffer; | |
720 | bufferlist[1].iov_len = bufferlen; | |
721 | bufferlist[2].iov_base = &aligned_data; | |
722 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 723 | |
5529eaf6 | 724 | return hv_ringbuffer_write(channel, bufferlist, num_vecs); |
3e7ee490 | 725 | } |
fff41b2e | 726 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 727 | |
3e189519 | 728 | /* |
5a668d8c | 729 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
87e93d61 S |
730 | * packets using a GPADL Direct packet type. This interface allows you |
731 | * to control notifying the host. This will be useful for sending | |
732 | * batched data. Also the sender can control the send flags | |
733 | * explicitly. | |
f4266e34 | 734 | */ |
5a668d8c | 735 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
736 | struct hv_page_buffer pagebuffers[], | |
737 | u32 pagecount, void *buffer, u32 bufferlen, | |
738 | u64 requestid) | |
3e7ee490 | 739 | { |
f4266e34 | 740 | int i; |
430a8e9a | 741 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
742 | u32 descsize; |
743 | u32 packetlen; | |
744 | u32 packetlen_aligned; | |
011a7c3c | 745 | struct kvec bufferlist[3]; |
39d70a4a | 746 | u64 aligned_data = 0; |
3e7ee490 | 747 | |
39d70a4a | 748 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 749 | return -EINVAL; |
3e7ee490 | 750 | |
f4266e34 | 751 | /* |
430a8e9a | 752 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
753 | * largest size we support |
754 | */ | |
39d70a4a HZ |
755 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
756 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 757 | sizeof(struct hv_page_buffer)); |
39d70a4a | 758 | packetlen = descsize + bufferlen; |
73509681 | 759 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 760 | |
454f18a9 | 761 | /* Setup the descriptor */ |
415f2287 | 762 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
5a668d8c | 763 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
bdc1dd47 | 764 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes granularity */ |
39d70a4a HZ |
765 | desc.length8 = (u16)(packetlen_aligned >> 3); |
766 | desc.transactionid = requestid; | |
33d426a9 | 767 | desc.reserved = 0; |
39d70a4a HZ |
768 | desc.rangecount = pagecount; |
769 | ||
770 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
771 | desc.range[i].len = pagebuffers[i].len; |
772 | desc.range[i].offset = pagebuffers[i].offset; | |
773 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
774 | } |
775 | ||
011a7c3c S |
776 | bufferlist[0].iov_base = &desc; |
777 | bufferlist[0].iov_len = descsize; | |
778 | bufferlist[1].iov_base = buffer; | |
779 | bufferlist[1].iov_len = bufferlen; | |
780 | bufferlist[2].iov_base = &aligned_data; | |
781 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 782 | |
5529eaf6 | 783 | return hv_ringbuffer_write(channel, bufferlist, 3); |
3e7ee490 | 784 | } |
713efeb4 | 785 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 786 | |
d61031ee S |
787 | /* |
788 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
789 | * using a GPADL Direct packet type. | |
790 | * The buffer includes the vmbus descriptor. | |
791 | */ | |
792 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
793 | struct vmbus_packet_mpb_array *desc, | |
794 | u32 desc_size, | |
795 | void *buffer, u32 bufferlen, u64 requestid) | |
796 | { | |
d61031ee S |
797 | u32 packetlen; |
798 | u32 packetlen_aligned; | |
799 | struct kvec bufferlist[3]; | |
800 | u64 aligned_data = 0; | |
d61031ee S |
801 | |
802 | packetlen = desc_size + bufferlen; | |
803 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
804 | ||
805 | /* Setup the descriptor */ | |
806 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
807 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
bdc1dd47 | 808 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes granularity */ |
d61031ee S |
809 | desc->length8 = (u16)(packetlen_aligned >> 3); |
810 | desc->transactionid = requestid; | |
33d426a9 | 811 | desc->reserved = 0; |
d61031ee S |
812 | desc->rangecount = 1; |
813 | ||
814 | bufferlist[0].iov_base = desc; | |
815 | bufferlist[0].iov_len = desc_size; | |
816 | bufferlist[1].iov_base = buffer; | |
817 | bufferlist[1].iov_len = bufferlen; | |
818 | bufferlist[2].iov_base = &aligned_data; | |
819 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
820 | ||
5529eaf6 | 821 | return hv_ringbuffer_write(channel, bufferlist, 3); |
d61031ee S |
822 | } |
823 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
824 | ||
c88c4e4c | 825 | /** |
fff41b2e | 826 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
827 | * @channel: Pointer to vmbus_channel structure. |
828 | * @buffer: Pointer to the buffer you want to receive the data into. | |
829 | * @bufferlen: Maximum size of what the the buffer will hold | |
830 | * @buffer_actual_len: The actual size of the data after it was received | |
831 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
832 | * |
833 | * Receives directly from the hyper-v vmbus and puts the data it received | |
834 | * into Buffer. This will receive the data unparsed from hyper-v. | |
835 | * | |
836 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 837 | */ |
667d3740 VK |
838 | static inline int |
839 | __vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
840 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid, | |
841 | bool raw) | |
3e7ee490 | 842 | { |
3372592a S |
843 | return hv_ringbuffer_read(channel, buffer, bufferlen, |
844 | buffer_actual_len, requestid, raw); | |
3e7ee490 | 845 | |
667d3740 VK |
846 | } |
847 | ||
848 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
849 | u32 bufferlen, u32 *buffer_actual_len, | |
850 | u64 *requestid) | |
851 | { | |
852 | return __vmbus_recvpacket(channel, buffer, bufferlen, | |
853 | buffer_actual_len, requestid, false); | |
3e7ee490 | 854 | } |
fff41b2e | 855 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 856 | |
3e189519 | 857 | /* |
fff41b2e | 858 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 859 | */ |
fff41b2e | 860 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
861 | u32 bufferlen, u32 *buffer_actual_len, |
862 | u64 *requestid) | |
3e7ee490 | 863 | { |
667d3740 VK |
864 | return __vmbus_recvpacket(channel, buffer, bufferlen, |
865 | buffer_actual_len, requestid, true); | |
3e7ee490 | 866 | } |
adaee6bd | 867 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |