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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> |
6ba34171 | 32 | #include <asm/page.h> |
3f335ea2 | 33 | |
0f2a6619 | 34 | #include "hyperv_vmbus.h" |
3e7ee490 | 35 | |
e3fe0bb6 S |
36 | #define NUM_PAGES_SPANNED(addr, len) \ |
37 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
38 | ||
6ba34171 MK |
39 | static unsigned long virt_to_hvpfn(void *addr) |
40 | { | |
41 | unsigned long paddr; | |
42 | ||
43 | if (is_vmalloc_addr(addr)) | |
44 | paddr = page_to_phys(vmalloc_to_page(addr)) + | |
45 | offset_in_page(addr); | |
46 | else | |
47 | paddr = __pa(addr); | |
48 | ||
49 | return paddr >> PAGE_SHIFT; | |
50 | } | |
51 | ||
3e189519 | 52 | /* |
fff41b2e | 53 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 54 | * channel. |
f4266e34 | 55 | */ |
1f6ee4e7 | 56 | void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 57 | { |
39d70a4a | 58 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 59 | |
991f8f1c VK |
60 | trace_vmbus_setevent(channel); |
61 | ||
3724287c S |
62 | /* |
63 | * For channels marked as in "low latency" mode | |
64 | * bypass the monitor page mechanism. | |
65 | */ | |
5c1bec61 SH |
66 | if (channel->offermsg.monitor_allocated && !channel->low_latency) { |
67 | vmbus_send_interrupt(channel->offermsg.child_relid); | |
3e7ee490 | 68 | |
8681db44 GKH |
69 | /* Get the child to parent monitor page */ |
70 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 71 | |
22356585 | 72 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
73 | (unsigned long *)&monitorpage->trigger_group |
74 | [channel->monitor_grp].pending); | |
7c369f40 | 75 | |
f4266e34 | 76 | } else { |
21c3bef5 | 77 | vmbus_set_event(channel); |
3e7ee490 | 78 | } |
3e7ee490 | 79 | } |
1f6ee4e7 | 80 | EXPORT_SYMBOL_GPL(vmbus_setevent); |
3e7ee490 | 81 | |
3e189519 | 82 | /* |
fff41b2e | 83 | * vmbus_open - Open the specified channel. |
f4266e34 | 84 | */ |
fff41b2e | 85 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
86 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
87 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 88 | { |
0987ff69 | 89 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 90 | struct vmbus_channel_msginfo *open_info = NULL; |
dd0813b6 | 91 | unsigned long flags; |
08a9513f | 92 | int ret, err = 0; |
294409d2 | 93 | struct page *page; |
3e7ee490 | 94 | |
98f531b1 VK |
95 | if (send_ringbuffer_size % PAGE_SIZE || |
96 | recv_ringbuffer_size % PAGE_SIZE) | |
97 | return -EINVAL; | |
98 | ||
67fae053 | 99 | spin_lock_irqsave(&newchannel->lock, flags); |
e68d2971 S |
100 | if (newchannel->state == CHANNEL_OPEN_STATE) { |
101 | newchannel->state = CHANNEL_OPENING_STATE; | |
102 | } else { | |
67fae053 | 103 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 S |
104 | return -EINVAL; |
105 | } | |
67fae053 | 106 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 | 107 | |
c50f7fb2 HZ |
108 | newchannel->onchannel_callback = onchannelcallback; |
109 | newchannel->channel_callback_context = context; | |
3e7ee490 | 110 | |
454f18a9 | 111 | /* Allocate the ring buffer */ |
294409d2 S |
112 | page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), |
113 | GFP_KERNEL|__GFP_ZERO, | |
114 | get_order(send_ringbuffer_size + | |
115 | recv_ringbuffer_size)); | |
116 | ||
117 | if (!page) | |
98f531b1 VK |
118 | page = alloc_pages(GFP_KERNEL|__GFP_ZERO, |
119 | get_order(send_ringbuffer_size + | |
120 | recv_ringbuffer_size)); | |
df3493e0 | 121 | |
98f531b1 | 122 | if (!page) { |
ac0d12b7 | 123 | err = -ENOMEM; |
98f531b1 | 124 | goto error_set_chnstate; |
ac0d12b7 | 125 | } |
3e7ee490 | 126 | |
9988ce68 | 127 | newchannel->ringbuffer_pages = page_address(page); |
c50f7fb2 | 128 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + |
39d70a4a | 129 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 130 | |
9988ce68 VK |
131 | ret = hv_ringbuffer_init(&newchannel->outbound, page, |
132 | send_ringbuffer_size >> PAGE_SHIFT); | |
72a95cbc | 133 | |
fd4dc88e | 134 | if (ret != 0) { |
3324fb40 | 135 | err = ret; |
98f531b1 | 136 | goto error_free_pages; |
3324fb40 BP |
137 | } |
138 | ||
9988ce68 VK |
139 | ret = hv_ringbuffer_init(&newchannel->inbound, |
140 | &page[send_ringbuffer_size >> PAGE_SHIFT], | |
141 | recv_ringbuffer_size >> PAGE_SHIFT); | |
fd4dc88e | 142 | if (ret != 0) { |
3324fb40 | 143 | err = ret; |
98f531b1 | 144 | goto error_free_pages; |
3324fb40 | 145 | } |
3e7ee490 | 146 | |
3e7ee490 | 147 | |
454f18a9 | 148 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 149 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 150 | |
fff41b2e | 151 | ret = vmbus_establish_gpadl(newchannel, |
9988ce68 VK |
152 | page_address(page), |
153 | send_ringbuffer_size + | |
154 | recv_ringbuffer_size, | |
155 | &newchannel->ringbuffer_gpadlhandle); | |
b94ef345 | 156 | |
fd4dc88e | 157 | if (ret != 0) { |
b94ef345 | 158 | err = ret; |
98f531b1 | 159 | goto error_free_pages; |
b94ef345 | 160 | } |
f4266e34 | 161 | |
454f18a9 | 162 | /* Create and init the channel open message */ |
176fb9e3 | 163 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
164 | sizeof(struct vmbus_channel_open_channel), |
165 | GFP_KERNEL); | |
176fb9e3 | 166 | if (!open_info) { |
c3bf2e26 | 167 | err = -ENOMEM; |
98f531b1 | 168 | goto error_free_gpadl; |
c3bf2e26 | 169 | } |
3e7ee490 | 170 | |
176fb9e3 | 171 | init_completion(&open_info->waitevent); |
ccb61f8a | 172 | open_info->waiting_channel = newchannel; |
3e7ee490 | 173 | |
176fb9e3 | 174 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
175 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
176 | open_msg->openid = newchannel->offermsg.child_relid; | |
177 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
178 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
179 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 180 | PAGE_SHIFT; |
abbf3b2a | 181 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 182 | |
39d70a4a | 183 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 184 | err = -EINVAL; |
98f531b1 | 185 | goto error_free_gpadl; |
c827f944 BP |
186 | } |
187 | ||
39d70a4a | 188 | if (userdatalen) |
0987ff69 | 189 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 190 | |
15b2f647 | 191 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 192 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 193 | &vmbus_connection.chn_msg_list); |
15b2f647 | 194 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 195 | |
6f3d791f S |
196 | if (newchannel->rescind) { |
197 | err = -ENODEV; | |
198 | goto error_free_gpadl; | |
199 | } | |
200 | ||
0987ff69 | 201 | ret = vmbus_post_msg(open_msg, |
c0bb0392 | 202 | sizeof(struct vmbus_channel_open_channel), true); |
98e08702 | 203 | |
9202d771 VK |
204 | trace_vmbus_open(open_msg, ret); |
205 | ||
45d727ce S |
206 | if (ret != 0) { |
207 | err = ret; | |
98f531b1 | 208 | goto error_clean_msglist; |
45d727ce | 209 | } |
3e7ee490 | 210 | |
396e287f | 211 | wait_for_completion(&open_info->waitevent); |
0c3b7b2f | 212 | |
15b2f647 | 213 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 214 | list_del(&open_info->msglistentry); |
15b2f647 | 215 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 216 | |
ccb61f8a S |
217 | if (newchannel->rescind) { |
218 | err = -ENODEV; | |
219 | goto error_free_gpadl; | |
220 | } | |
221 | ||
ffc151f3 VK |
222 | if (open_info->response.open_result.status) { |
223 | err = -EAGAIN; | |
98f531b1 | 224 | goto error_free_gpadl; |
ffc151f3 | 225 | } |
e68d2971 | 226 | |
ffc151f3 | 227 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 228 | kfree(open_info); |
ffc151f3 | 229 | return 0; |
c3bf2e26 | 230 | |
98f531b1 | 231 | error_clean_msglist: |
13925502 S |
232 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
233 | list_del(&open_info->msglistentry); | |
234 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
235 | ||
98f531b1 | 236 | error_free_gpadl: |
40384e4b | 237 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); |
98f531b1 VK |
238 | kfree(open_info); |
239 | error_free_pages: | |
9988ce68 VK |
240 | hv_ringbuffer_cleanup(&newchannel->outbound); |
241 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
242 | __free_pages(page, | |
243 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
98f531b1 | 244 | error_set_chnstate: |
ac0d12b7 | 245 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 246 | return err; |
3e7ee490 | 247 | } |
36ceadfc | 248 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 249 | |
5c23a1a5 DC |
250 | /* Used for Hyper-V Socket: a guest client's connect() to the host */ |
251 | int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id, | |
252 | const uuid_le *shv_host_servie_id) | |
253 | { | |
254 | struct vmbus_channel_tl_connect_request conn_msg; | |
98f31a00 | 255 | int ret; |
5c23a1a5 DC |
256 | |
257 | memset(&conn_msg, 0, sizeof(conn_msg)); | |
258 | conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST; | |
259 | conn_msg.guest_endpoint_id = *shv_guest_servie_id; | |
260 | conn_msg.host_service_id = *shv_host_servie_id; | |
261 | ||
98f31a00 VK |
262 | ret = vmbus_post_msg(&conn_msg, sizeof(conn_msg), true); |
263 | ||
264 | trace_vmbus_send_tl_connect_request(&conn_msg, ret); | |
265 | ||
266 | return ret; | |
5c23a1a5 DC |
267 | } |
268 | EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request); | |
269 | ||
3e189519 | 270 | /* |
fff41b2e | 271 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 272 | */ |
fff41b2e | 273 | static int create_gpadl_header(void *kbuffer, u32 size, |
4d637632 | 274 | struct vmbus_channel_msginfo **msginfo) |
3e7ee490 HJ |
275 | { |
276 | int i; | |
39d70a4a | 277 | int pagecount; |
39d70a4a HZ |
278 | struct vmbus_channel_gpadl_header *gpadl_header; |
279 | struct vmbus_channel_gpadl_body *gpadl_body; | |
280 | struct vmbus_channel_msginfo *msgheader; | |
281 | struct vmbus_channel_msginfo *msgbody = NULL; | |
282 | u32 msgsize; | |
3e7ee490 | 283 | |
39d70a4a | 284 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 285 | |
39d70a4a | 286 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 287 | |
454f18a9 | 288 | /* do we need a gpadl body msg */ |
39d70a4a | 289 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
290 | sizeof(struct vmbus_channel_gpadl_header) - |
291 | sizeof(struct gpa_range); | |
39d70a4a | 292 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 293 | |
39d70a4a | 294 | if (pagecount > pfncount) { |
f4266e34 | 295 | /* we need a gpadl body */ |
454f18a9 | 296 | /* fill in the header */ |
39d70a4a | 297 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 298 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
299 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
300 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
301 | if (!msgheader) | |
d1c250bb | 302 | goto nomem; |
3e7ee490 | 303 | |
c50f7fb2 HZ |
304 | INIT_LIST_HEAD(&msgheader->submsglist); |
305 | msgheader->msgsize = msgsize; | |
3e7ee490 | 306 | |
39d70a4a | 307 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
308 | msgheader->msg; |
309 | gpadl_header->rangecount = 1; | |
310 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 311 | pagecount * sizeof(u64); |
415f2287 HZ |
312 | gpadl_header->range[0].byte_offset = 0; |
313 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 314 | for (i = 0; i < pfncount; i++) |
6ba34171 MK |
315 | gpadl_header->range[0].pfn_array[i] = virt_to_hvpfn( |
316 | kbuffer + PAGE_SIZE * i); | |
39d70a4a | 317 | *msginfo = msgheader; |
3e7ee490 | 318 | |
39d70a4a HZ |
319 | pfnsum = pfncount; |
320 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 321 | |
454f18a9 | 322 | /* how many pfns can we fit */ |
39d70a4a | 323 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 324 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 325 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 326 | |
454f18a9 | 327 | /* fill in the body */ |
39d70a4a HZ |
328 | while (pfnleft) { |
329 | if (pfnleft > pfncount) | |
330 | pfncurr = pfncount; | |
3e7ee490 | 331 | else |
39d70a4a | 332 | pfncurr = pfnleft; |
3e7ee490 | 333 | |
39d70a4a | 334 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 335 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
336 | pfncurr * sizeof(u64); |
337 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
338 | |
339 | if (!msgbody) { | |
340 | struct vmbus_channel_msginfo *pos = NULL; | |
341 | struct vmbus_channel_msginfo *tmp = NULL; | |
342 | /* | |
343 | * Free up all the allocated messages. | |
344 | */ | |
345 | list_for_each_entry_safe(pos, tmp, | |
346 | &msgheader->submsglist, | |
347 | msglistentry) { | |
348 | ||
349 | list_del(&pos->msglistentry); | |
350 | kfree(pos); | |
351 | } | |
352 | ||
d1c250bb | 353 | goto nomem; |
f38cf9cc S |
354 | } |
355 | ||
c50f7fb2 | 356 | msgbody->msgsize = msgsize; |
39d70a4a | 357 | gpadl_body = |
c50f7fb2 | 358 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
359 | |
360 | /* | |
f4266e34 GKH |
361 | * Gpadl is u32 and we are using a pointer which could |
362 | * be 64-bit | |
f27df643 | 363 | * This is governed by the guest/host protocol and |
bdc1dd47 | 364 | * so the hypervisor guarantees that this is ok. |
f4266e34 | 365 | */ |
39d70a4a | 366 | for (i = 0; i < pfncurr; i++) |
6ba34171 MK |
367 | gpadl_body->pfn[i] = virt_to_hvpfn( |
368 | kbuffer + PAGE_SIZE * (pfnsum + i)); | |
3e7ee490 | 369 | |
454f18a9 | 370 | /* add to msg header */ |
c50f7fb2 HZ |
371 | list_add_tail(&msgbody->msglistentry, |
372 | &msgheader->submsglist); | |
39d70a4a HZ |
373 | pfnsum += pfncurr; |
374 | pfnleft -= pfncurr; | |
3e7ee490 | 375 | } |
f4266e34 | 376 | } else { |
454f18a9 | 377 | /* everything fits in a header */ |
39d70a4a | 378 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 379 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
380 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
381 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
382 | if (msgheader == NULL) | |
e3eb7cdd | 383 | goto nomem; |
4d637632 VK |
384 | |
385 | INIT_LIST_HEAD(&msgheader->submsglist); | |
c50f7fb2 | 386 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
387 | |
388 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
389 | msgheader->msg; |
390 | gpadl_header->rangecount = 1; | |
391 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 392 | pagecount * sizeof(u64); |
415f2287 HZ |
393 | gpadl_header->range[0].byte_offset = 0; |
394 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 395 | for (i = 0; i < pagecount; i++) |
6ba34171 MK |
396 | gpadl_header->range[0].pfn_array[i] = virt_to_hvpfn( |
397 | kbuffer + PAGE_SIZE * i); | |
39d70a4a HZ |
398 | |
399 | *msginfo = msgheader; | |
3e7ee490 HJ |
400 | } |
401 | ||
402 | return 0; | |
d1c250bb | 403 | nomem: |
39d70a4a HZ |
404 | kfree(msgheader); |
405 | kfree(msgbody); | |
d1c250bb | 406 | return -ENOMEM; |
3e7ee490 HJ |
407 | } |
408 | ||
3e189519 | 409 | /* |
bdc1dd47 | 410 | * vmbus_establish_gpadl - Establish a GPADL for the specified buffer |
f4266e34 | 411 | * |
39d70a4a | 412 | * @channel: a channel |
b679ef73 | 413 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
414 | * @size: page-size multiple |
415 | * @gpadl_handle: some funky thing | |
f4266e34 | 416 | */ |
fff41b2e | 417 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 418 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 419 | { |
39d70a4a HZ |
420 | struct vmbus_channel_gpadl_header *gpadlmsg; |
421 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a | 422 | struct vmbus_channel_msginfo *msginfo = NULL; |
7cc80c98 | 423 | struct vmbus_channel_msginfo *submsginfo, *tmp; |
53af545b | 424 | struct list_head *curr; |
39d70a4a | 425 | u32 next_gpadl_handle; |
dd0813b6 | 426 | unsigned long flags; |
c3bf2e26 | 427 | int ret = 0; |
3e7ee490 | 428 | |
9f52a163 S |
429 | next_gpadl_handle = |
430 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 431 | |
4d637632 | 432 | ret = create_gpadl_header(kbuffer, size, &msginfo); |
c3bf2e26 BP |
433 | if (ret) |
434 | return ret; | |
3e7ee490 | 435 | |
9568a193 | 436 | init_completion(&msginfo->waitevent); |
ccb61f8a | 437 | msginfo->waiting_channel = channel; |
c3bf2e26 | 438 | |
c50f7fb2 HZ |
439 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
440 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
441 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
442 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 443 | |
3e7ee490 | 444 | |
15b2f647 | 445 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 446 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 447 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 448 | |
15b2f647 | 449 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 450 | |
6f3d791f S |
451 | if (channel->rescind) { |
452 | ret = -ENODEV; | |
453 | goto cleanup; | |
454 | } | |
455 | ||
c6977677 | 456 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
c0bb0392 | 457 | sizeof(*msginfo), true); |
69edbd5f VK |
458 | |
459 | trace_vmbus_establish_gpadl_header(gpadlmsg, ret); | |
460 | ||
98e08702 | 461 | if (ret != 0) |
00d760b0 | 462 | goto cleanup; |
3e7ee490 | 463 | |
4d637632 VK |
464 | list_for_each(curr, &msginfo->submsglist) { |
465 | submsginfo = (struct vmbus_channel_msginfo *)curr; | |
466 | gpadl_body = | |
467 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; | |
53af545b | 468 | |
4d637632 VK |
469 | gpadl_body->header.msgtype = |
470 | CHANNELMSG_GPADL_BODY; | |
471 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 472 | |
4d637632 | 473 | ret = vmbus_post_msg(gpadl_body, |
c0bb0392 VK |
474 | submsginfo->msgsize - sizeof(*submsginfo), |
475 | true); | |
69edbd5f VK |
476 | |
477 | trace_vmbus_establish_gpadl_body(gpadl_body, ret); | |
478 | ||
4d637632 VK |
479 | if (ret != 0) |
480 | goto cleanup; | |
3e7ee490 | 481 | |
3e7ee490 | 482 | } |
72c6b71c | 483 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 484 | |
ccb61f8a S |
485 | if (channel->rescind) { |
486 | ret = -ENODEV; | |
487 | goto cleanup; | |
488 | } | |
489 | ||
454f18a9 | 490 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 491 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 492 | |
00d760b0 | 493 | cleanup: |
15b2f647 | 494 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 495 | list_del(&msginfo->msglistentry); |
15b2f647 | 496 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
7cc80c98 VK |
497 | list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist, |
498 | msglistentry) { | |
499 | kfree(submsginfo); | |
500 | } | |
3e7ee490 | 501 | |
39d70a4a | 502 | kfree(msginfo); |
3e7ee490 HJ |
503 | return ret; |
504 | } | |
98873724 | 505 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 506 | |
3e189519 | 507 | /* |
fff41b2e | 508 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 509 | */ |
fff41b2e | 510 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 511 | { |
82250213 | 512 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 513 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 514 | unsigned long flags; |
66be6530 | 515 | int ret; |
3e7ee490 | 516 | |
f4266e34 GKH |
517 | info = kmalloc(sizeof(*info) + |
518 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
519 | if (!info) |
520 | return -ENOMEM; | |
3e7ee490 | 521 | |
9568a193 | 522 | init_completion(&info->waitevent); |
ccb61f8a | 523 | info->waiting_channel = channel; |
3e7ee490 | 524 | |
c50f7fb2 | 525 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 526 | |
c50f7fb2 HZ |
527 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
528 | msg->child_relid = channel->offermsg.child_relid; | |
529 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 530 | |
15b2f647 | 531 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 532 | list_add_tail(&info->msglistentry, |
da9fcb72 | 533 | &vmbus_connection.chn_msg_list); |
15b2f647 | 534 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
6f3d791f S |
535 | |
536 | if (channel->rescind) | |
537 | goto post_msg_err; | |
538 | ||
c0bb0392 VK |
539 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_gpadl_teardown), |
540 | true); | |
3e7ee490 | 541 | |
09cdf8f8 VK |
542 | trace_vmbus_teardown_gpadl(msg, ret); |
543 | ||
66be6530 S |
544 | if (ret) |
545 | goto post_msg_err; | |
546 | ||
547 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 548 | |
66be6530 | 549 | post_msg_err: |
5e030d5c S |
550 | /* |
551 | * If the channel has been rescinded; | |
552 | * we will be awakened by the rescind | |
553 | * handler; set the error code to zero so we don't leak memory. | |
554 | */ | |
555 | if (channel->rescind) | |
556 | ret = 0; | |
557 | ||
15b2f647 | 558 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 559 | list_del(&info->msglistentry); |
15b2f647 | 560 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 561 | |
8c69f52a | 562 | kfree(info); |
3e7ee490 HJ |
563 | return ret; |
564 | } | |
18726d7a | 565 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 566 | |
d3ba720d S |
567 | static void reset_channel_cb(void *arg) |
568 | { | |
569 | struct vmbus_channel *channel = arg; | |
570 | ||
571 | channel->onchannel_callback = NULL; | |
572 | } | |
573 | ||
d3b26dd7 | 574 | void vmbus_reset_channel_cb(struct vmbus_channel *channel) |
3e7ee490 | 575 | { |
63d55b2a | 576 | /* |
dad72a1d | 577 | * vmbus_on_event(), running in the per-channel tasklet, can race |
63d55b2a DC |
578 | * with vmbus_close_internal() in the case of SMP guest, e.g., when |
579 | * the former is accessing channel->inbound.ring_buffer, the latter | |
dad72a1d DC |
580 | * could be freeing the ring_buffer pages, so here we must stop it |
581 | * first. | |
63d55b2a | 582 | */ |
dad72a1d | 583 | tasklet_disable(&channel->callback_event); |
63d55b2a | 584 | |
d3b26dd7 DC |
585 | channel->sc_creation_callback = NULL; |
586 | ||
587 | /* Stop the callback asap */ | |
588 | if (channel->target_cpu != get_cpu()) { | |
589 | put_cpu(); | |
590 | smp_call_function_single(channel->target_cpu, reset_channel_cb, | |
591 | channel, true); | |
592 | } else { | |
593 | reset_channel_cb(channel); | |
594 | put_cpu(); | |
595 | } | |
596 | ||
597 | /* Re-enable tasklet for use on re-open */ | |
598 | tasklet_enable(&channel->callback_event); | |
599 | } | |
600 | ||
601 | static int vmbus_close_internal(struct vmbus_channel *channel) | |
602 | { | |
603 | struct vmbus_channel_close_channel *msg; | |
604 | int ret; | |
605 | ||
606 | vmbus_reset_channel_cb(channel); | |
607 | ||
64b7faf9 DC |
608 | /* |
609 | * In case a device driver's probe() fails (e.g., | |
610 | * util_probe() -> vmbus_open() returns -ENOMEM) and the device is | |
8a1115ff | 611 | * rescinded later (e.g., we dynamically disable an Integrated Service |
64b7faf9 DC |
612 | * in Hyper-V Manager), the driver's remove() invokes vmbus_close(): |
613 | * here we should skip most of the below cleanup work. | |
614 | */ | |
615 | if (channel->state != CHANNEL_OPENED_STATE) { | |
616 | ret = -EINVAL; | |
617 | goto out; | |
618 | } | |
619 | ||
e68d2971 | 620 | channel->state = CHANNEL_OPEN_STATE; |
3e7ee490 | 621 | |
454f18a9 | 622 | /* Send a closing message */ |
3e7ee490 | 623 | |
e9a27a9f | 624 | msg = &channel->close_msg.msg; |
3e7ee490 | 625 | |
c50f7fb2 HZ |
626 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
627 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 628 | |
c0bb0392 VK |
629 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel), |
630 | true); | |
3e7ee490 | 631 | |
633b005d VK |
632 | trace_vmbus_close_internal(msg, ret); |
633 | ||
98d731bb S |
634 | if (ret) { |
635 | pr_err("Close failed: close post msg return is %d\n", ret); | |
636 | /* | |
637 | * If we failed to post the close msg, | |
638 | * it is perhaps better to leak memory. | |
639 | */ | |
63d55b2a | 640 | goto out; |
98d731bb S |
641 | } |
642 | ||
454f18a9 | 643 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
644 | if (channel->ringbuffer_gpadlhandle) { |
645 | ret = vmbus_teardown_gpadl(channel, | |
646 | channel->ringbuffer_gpadlhandle); | |
647 | if (ret) { | |
648 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
649 | /* | |
650 | * If we failed to teardown gpadl, | |
651 | * it is perhaps better to leak memory. | |
652 | */ | |
63d55b2a | 653 | goto out; |
98d731bb S |
654 | } |
655 | } | |
3e7ee490 | 656 | |
454f18a9 | 657 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
658 | hv_ringbuffer_cleanup(&channel->outbound); |
659 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 660 | |
df3493e0 S |
661 | free_pages((unsigned long)channel->ringbuffer_pages, |
662 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 663 | |
63d55b2a | 664 | out: |
98d731bb | 665 | return ret; |
3e7ee490 | 666 | } |
e68d2971 S |
667 | |
668 | /* | |
669 | * vmbus_close - Close the specified channel | |
670 | */ | |
671 | void vmbus_close(struct vmbus_channel *channel) | |
672 | { | |
673 | struct list_head *cur, *tmp; | |
674 | struct vmbus_channel *cur_channel; | |
675 | ||
676 | if (channel->primary_channel != NULL) { | |
677 | /* | |
678 | * We will only close sub-channels when | |
679 | * the primary is closed. | |
680 | */ | |
681 | return; | |
682 | } | |
683 | /* | |
684 | * Close all the sub-channels first and then close the | |
685 | * primary channel. | |
686 | */ | |
687 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
688 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
54a66265 | 689 | if (cur_channel->rescind) { |
7fa32e5e S |
690 | wait_for_completion(&cur_channel->rescind_event); |
691 | mutex_lock(&vmbus_connection.channel_mutex); | |
692 | vmbus_close_internal(cur_channel); | |
192b2d78 | 693 | hv_process_channel_removal( |
54a66265 | 694 | cur_channel->offermsg.child_relid); |
7fa32e5e S |
695 | } else { |
696 | mutex_lock(&vmbus_connection.channel_mutex); | |
697 | vmbus_close_internal(cur_channel); | |
54a66265 | 698 | } |
7fa32e5e | 699 | mutex_unlock(&vmbus_connection.channel_mutex); |
e68d2971 S |
700 | } |
701 | /* | |
702 | * Now close the primary. | |
703 | */ | |
7fa32e5e | 704 | mutex_lock(&vmbus_connection.channel_mutex); |
e68d2971 | 705 | vmbus_close_internal(channel); |
192b2d78 | 706 | mutex_unlock(&vmbus_connection.channel_mutex); |
e68d2971 | 707 | } |
70bfa307 | 708 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 709 | |
5dd0fb9b | 710 | /** |
711 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
712 | * @channel: Pointer to vmbus_channel structure. | |
713 | * @buffer: Pointer to the buffer you want to receive the data into. | |
714 | * @bufferlen: Maximum size of what the the buffer will hold | |
715 | * @requestid: Identifier of the request | |
716 | * @type: Type of packet that is being send e.g. negotiate, time | |
717 | * packet etc. | |
718 | * | |
719 | * Sends data in @buffer directly to hyper-v via the vmbus | |
720 | * This will send the data unparsed to hyper-v. | |
721 | * | |
722 | * Mainly used by Hyper-V drivers. | |
723 | */ | |
724 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
725 | u32 bufferlen, u64 requestid, | |
726 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 727 | { |
8dc0a06a | 728 | struct vmpacket_descriptor desc; |
39d70a4a | 729 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 730 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 731 | struct kvec bufferlist[3]; |
39d70a4a | 732 | u64 aligned_data = 0; |
b81658cf | 733 | int num_vecs = ((bufferlen != 0) ? 3 : 1); |
3e7ee490 | 734 | |
3e7ee490 | 735 | |
454f18a9 | 736 | /* Setup the descriptor */ |
415f2287 HZ |
737 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
738 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 739 | /* in 8-bytes granularity */ |
415f2287 HZ |
740 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
741 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
742 | desc.trans_id = requestid; | |
3e7ee490 | 743 | |
011a7c3c S |
744 | bufferlist[0].iov_base = &desc; |
745 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
746 | bufferlist[1].iov_base = buffer; | |
747 | bufferlist[1].iov_len = bufferlen; | |
748 | bufferlist[2].iov_base = &aligned_data; | |
749 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 750 | |
5529eaf6 | 751 | return hv_ringbuffer_write(channel, bufferlist, num_vecs); |
3e7ee490 | 752 | } |
fff41b2e | 753 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 754 | |
3e189519 | 755 | /* |
5a668d8c | 756 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
87e93d61 S |
757 | * packets using a GPADL Direct packet type. This interface allows you |
758 | * to control notifying the host. This will be useful for sending | |
759 | * batched data. Also the sender can control the send flags | |
760 | * explicitly. | |
f4266e34 | 761 | */ |
5a668d8c | 762 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
763 | struct hv_page_buffer pagebuffers[], | |
764 | u32 pagecount, void *buffer, u32 bufferlen, | |
765 | u64 requestid) | |
3e7ee490 | 766 | { |
f4266e34 | 767 | int i; |
430a8e9a | 768 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
769 | u32 descsize; |
770 | u32 packetlen; | |
771 | u32 packetlen_aligned; | |
011a7c3c | 772 | struct kvec bufferlist[3]; |
39d70a4a | 773 | u64 aligned_data = 0; |
3e7ee490 | 774 | |
39d70a4a | 775 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 776 | return -EINVAL; |
3e7ee490 | 777 | |
f4266e34 | 778 | /* |
430a8e9a | 779 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
780 | * largest size we support |
781 | */ | |
39d70a4a HZ |
782 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
783 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 784 | sizeof(struct hv_page_buffer)); |
39d70a4a | 785 | packetlen = descsize + bufferlen; |
73509681 | 786 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 787 | |
454f18a9 | 788 | /* Setup the descriptor */ |
415f2287 | 789 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
5a668d8c | 790 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
bdc1dd47 | 791 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes granularity */ |
39d70a4a HZ |
792 | desc.length8 = (u16)(packetlen_aligned >> 3); |
793 | desc.transactionid = requestid; | |
33d426a9 | 794 | desc.reserved = 0; |
39d70a4a HZ |
795 | desc.rangecount = pagecount; |
796 | ||
797 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
798 | desc.range[i].len = pagebuffers[i].len; |
799 | desc.range[i].offset = pagebuffers[i].offset; | |
800 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
801 | } |
802 | ||
011a7c3c S |
803 | bufferlist[0].iov_base = &desc; |
804 | bufferlist[0].iov_len = descsize; | |
805 | bufferlist[1].iov_base = buffer; | |
806 | bufferlist[1].iov_len = bufferlen; | |
807 | bufferlist[2].iov_base = &aligned_data; | |
808 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 809 | |
5529eaf6 | 810 | return hv_ringbuffer_write(channel, bufferlist, 3); |
3e7ee490 | 811 | } |
713efeb4 | 812 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 813 | |
d61031ee S |
814 | /* |
815 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
816 | * using a GPADL Direct packet type. | |
817 | * The buffer includes the vmbus descriptor. | |
818 | */ | |
819 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
820 | struct vmbus_packet_mpb_array *desc, | |
821 | u32 desc_size, | |
822 | void *buffer, u32 bufferlen, u64 requestid) | |
823 | { | |
d61031ee S |
824 | u32 packetlen; |
825 | u32 packetlen_aligned; | |
826 | struct kvec bufferlist[3]; | |
827 | u64 aligned_data = 0; | |
d61031ee S |
828 | |
829 | packetlen = desc_size + bufferlen; | |
830 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
831 | ||
832 | /* Setup the descriptor */ | |
833 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
834 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
bdc1dd47 | 835 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes granularity */ |
d61031ee S |
836 | desc->length8 = (u16)(packetlen_aligned >> 3); |
837 | desc->transactionid = requestid; | |
33d426a9 | 838 | desc->reserved = 0; |
d61031ee S |
839 | desc->rangecount = 1; |
840 | ||
841 | bufferlist[0].iov_base = desc; | |
842 | bufferlist[0].iov_len = desc_size; | |
843 | bufferlist[1].iov_base = buffer; | |
844 | bufferlist[1].iov_len = bufferlen; | |
845 | bufferlist[2].iov_base = &aligned_data; | |
846 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
847 | ||
5529eaf6 | 848 | return hv_ringbuffer_write(channel, bufferlist, 3); |
d61031ee S |
849 | } |
850 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
851 | ||
c88c4e4c | 852 | /** |
fff41b2e | 853 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
854 | * @channel: Pointer to vmbus_channel structure. |
855 | * @buffer: Pointer to the buffer you want to receive the data into. | |
856 | * @bufferlen: Maximum size of what the the buffer will hold | |
857 | * @buffer_actual_len: The actual size of the data after it was received | |
858 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
859 | * |
860 | * Receives directly from the hyper-v vmbus and puts the data it received | |
861 | * into Buffer. This will receive the data unparsed from hyper-v. | |
862 | * | |
863 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 864 | */ |
667d3740 VK |
865 | static inline int |
866 | __vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
867 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid, | |
868 | bool raw) | |
3e7ee490 | 869 | { |
3372592a S |
870 | return hv_ringbuffer_read(channel, buffer, bufferlen, |
871 | buffer_actual_len, requestid, raw); | |
3e7ee490 | 872 | |
667d3740 VK |
873 | } |
874 | ||
875 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
876 | u32 bufferlen, u32 *buffer_actual_len, | |
877 | u64 *requestid) | |
878 | { | |
879 | return __vmbus_recvpacket(channel, buffer, bufferlen, | |
880 | buffer_actual_len, requestid, false); | |
3e7ee490 | 881 | } |
fff41b2e | 882 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 883 | |
3e189519 | 884 | /* |
fff41b2e | 885 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 886 | */ |
fff41b2e | 887 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
888 | u32 bufferlen, u32 *buffer_actual_len, |
889 | u64 *requestid) | |
3e7ee490 | 890 | { |
667d3740 VK |
891 | return __vmbus_recvpacket(channel, buffer, bufferlen, |
892 | buffer_actual_len, requestid, true); | |
3e7ee490 | 893 | } |
adaee6bd | 894 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |