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_pending = |
f6feebe0 | 74 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 75 | debuginfo->servermonitor_latency = |
f6feebe0 | 76 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 77 | debuginfo->servermonitor_connectionid = |
f6feebe0 HZ |
78 | monitorpage->parameter[monitor_group] |
79 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 80 | |
8681db44 | 81 | monitorpage = vmbus_connection.monitor_pages[1]; |
c50f7fb2 | 82 | debuginfo->clientmonitor_pending = |
f6feebe0 | 83 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 84 | debuginfo->clientmonitor_latency = |
f6feebe0 | 85 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 86 | debuginfo->clientmonitor_connectionid = |
f6feebe0 HZ |
87 | monitorpage->parameter[monitor_group] |
88 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 89 | |
a75b61d5 S |
90 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
91 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
92 | } |
93 | ||
3e189519 | 94 | /* |
fff41b2e | 95 | * vmbus_open - Open the specified channel. |
f4266e34 | 96 | */ |
fff41b2e | 97 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
98 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
99 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 100 | { |
0987ff69 | 101 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 102 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 103 | void *in, *out; |
dd0813b6 | 104 | unsigned long flags; |
9568a193 | 105 | int ret, t, err = 0; |
3e7ee490 | 106 | |
e68d2971 S |
107 | spin_lock_irqsave(&newchannel->sc_lock, flags); |
108 | if (newchannel->state == CHANNEL_OPEN_STATE) { | |
109 | newchannel->state = CHANNEL_OPENING_STATE; | |
110 | } else { | |
111 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
112 | return -EINVAL; | |
113 | } | |
114 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
115 | ||
c50f7fb2 HZ |
116 | newchannel->onchannel_callback = onchannelcallback; |
117 | newchannel->channel_callback_context = context; | |
3e7ee490 | 118 | |
454f18a9 | 119 | /* Allocate the ring buffer */ |
df3493e0 S |
120 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
121 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
122 | ||
7e052d98 BP |
123 | if (!out) |
124 | return -ENOMEM; | |
125 | ||
3e7ee490 | 126 | |
39d70a4a | 127 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 128 | |
c50f7fb2 HZ |
129 | newchannel->ringbuffer_pages = out; |
130 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 131 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 132 | |
72a95cbc S |
133 | ret = hv_ringbuffer_init( |
134 | &newchannel->outbound, out, send_ringbuffer_size); | |
135 | ||
fd4dc88e | 136 | if (ret != 0) { |
3324fb40 | 137 | err = ret; |
13925502 | 138 | goto error0; |
3324fb40 BP |
139 | } |
140 | ||
72a95cbc S |
141 | ret = hv_ringbuffer_init( |
142 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 143 | if (ret != 0) { |
3324fb40 | 144 | err = ret; |
13925502 | 145 | goto error0; |
3324fb40 | 146 | } |
3e7ee490 | 147 | |
3e7ee490 | 148 | |
454f18a9 | 149 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 150 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 151 | |
fff41b2e | 152 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 153 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
154 | send_ringbuffer_size + |
155 | recv_ringbuffer_size, | |
c50f7fb2 | 156 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 157 | |
fd4dc88e | 158 | if (ret != 0) { |
b94ef345 | 159 | err = ret; |
13925502 | 160 | goto error0; |
b94ef345 | 161 | } |
f4266e34 | 162 | |
454f18a9 | 163 | /* Create and init the channel open message */ |
176fb9e3 | 164 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
165 | sizeof(struct vmbus_channel_open_channel), |
166 | GFP_KERNEL); | |
176fb9e3 | 167 | if (!open_info) { |
c3bf2e26 | 168 | err = -ENOMEM; |
13925502 | 169 | goto error0; |
c3bf2e26 | 170 | } |
3e7ee490 | 171 | |
176fb9e3 | 172 | init_completion(&open_info->waitevent); |
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; |
13925502 | 185 | goto error0; |
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 | |
0987ff69 | 196 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 197 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
198 | |
199 | if (ret != 0) | |
13925502 | 200 | goto error1; |
3e7ee490 | 201 | |
176fb9e3 | 202 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 203 | if (t == 0) { |
0c3b7b2f | 204 | err = -ETIMEDOUT; |
13925502 | 205 | goto error1; |
0c3b7b2f S |
206 | } |
207 | ||
3e7ee490 | 208 | |
176fb9e3 S |
209 | if (open_info->response.open_result.status) |
210 | err = open_info->response.open_result.status; | |
3e7ee490 | 211 | |
15b2f647 | 212 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 213 | list_del(&open_info->msglistentry); |
15b2f647 | 214 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 215 | |
e68d2971 S |
216 | if (err == 0) |
217 | newchannel->state = CHANNEL_OPENED_STATE; | |
218 | ||
176fb9e3 | 219 | kfree(open_info); |
98e08702 | 220 | return err; |
c3bf2e26 | 221 | |
13925502 S |
222 | error1: |
223 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
224 | list_del(&open_info->msglistentry); | |
225 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
226 | ||
227 | error0: | |
df3493e0 S |
228 | free_pages((unsigned long)out, |
229 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 230 | kfree(open_info); |
c3bf2e26 | 231 | return err; |
3e7ee490 | 232 | } |
36ceadfc | 233 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 234 | |
3e189519 | 235 | /* |
fff41b2e | 236 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 237 | */ |
fff41b2e | 238 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
239 | struct vmbus_channel_msginfo **msginfo, |
240 | u32 *messagecount) | |
3e7ee490 HJ |
241 | { |
242 | int i; | |
39d70a4a | 243 | int pagecount; |
f4266e34 | 244 | unsigned long long pfn; |
39d70a4a HZ |
245 | struct vmbus_channel_gpadl_header *gpadl_header; |
246 | struct vmbus_channel_gpadl_body *gpadl_body; | |
247 | struct vmbus_channel_msginfo *msgheader; | |
248 | struct vmbus_channel_msginfo *msgbody = NULL; | |
249 | u32 msgsize; | |
3e7ee490 | 250 | |
39d70a4a | 251 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 252 | |
39d70a4a HZ |
253 | pagecount = size >> PAGE_SHIFT; |
254 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 255 | |
454f18a9 | 256 | /* do we need a gpadl body msg */ |
39d70a4a | 257 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
258 | sizeof(struct vmbus_channel_gpadl_header) - |
259 | sizeof(struct gpa_range); | |
39d70a4a | 260 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 261 | |
39d70a4a | 262 | if (pagecount > pfncount) { |
f4266e34 | 263 | /* we need a gpadl body */ |
454f18a9 | 264 | /* fill in the header */ |
39d70a4a | 265 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 266 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
267 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
268 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
269 | if (!msgheader) | |
d1c250bb | 270 | goto nomem; |
3e7ee490 | 271 | |
c50f7fb2 HZ |
272 | INIT_LIST_HEAD(&msgheader->submsglist); |
273 | msgheader->msgsize = msgsize; | |
3e7ee490 | 274 | |
39d70a4a | 275 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
276 | msgheader->msg; |
277 | gpadl_header->rangecount = 1; | |
278 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 279 | pagecount * sizeof(u64); |
415f2287 HZ |
280 | gpadl_header->range[0].byte_offset = 0; |
281 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 282 | for (i = 0; i < pfncount; i++) |
415f2287 | 283 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
284 | *msginfo = msgheader; |
285 | *messagecount = 1; | |
3e7ee490 | 286 | |
39d70a4a HZ |
287 | pfnsum = pfncount; |
288 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 289 | |
454f18a9 | 290 | /* how many pfns can we fit */ |
39d70a4a | 291 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 292 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 293 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 294 | |
454f18a9 | 295 | /* fill in the body */ |
39d70a4a HZ |
296 | while (pfnleft) { |
297 | if (pfnleft > pfncount) | |
298 | pfncurr = pfncount; | |
3e7ee490 | 299 | else |
39d70a4a | 300 | pfncurr = pfnleft; |
3e7ee490 | 301 | |
39d70a4a | 302 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 303 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
304 | pfncurr * sizeof(u64); |
305 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
306 | |
307 | if (!msgbody) { | |
308 | struct vmbus_channel_msginfo *pos = NULL; | |
309 | struct vmbus_channel_msginfo *tmp = NULL; | |
310 | /* | |
311 | * Free up all the allocated messages. | |
312 | */ | |
313 | list_for_each_entry_safe(pos, tmp, | |
314 | &msgheader->submsglist, | |
315 | msglistentry) { | |
316 | ||
317 | list_del(&pos->msglistentry); | |
318 | kfree(pos); | |
319 | } | |
320 | ||
d1c250bb | 321 | goto nomem; |
f38cf9cc S |
322 | } |
323 | ||
c50f7fb2 | 324 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
325 | (*messagecount)++; |
326 | gpadl_body = | |
c50f7fb2 | 327 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
328 | |
329 | /* | |
f4266e34 GKH |
330 | * Gpadl is u32 and we are using a pointer which could |
331 | * be 64-bit | |
f27df643 S |
332 | * This is governed by the guest/host protocol and |
333 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 334 | */ |
39d70a4a | 335 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 336 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 337 | |
454f18a9 | 338 | /* add to msg header */ |
c50f7fb2 HZ |
339 | list_add_tail(&msgbody->msglistentry, |
340 | &msgheader->submsglist); | |
39d70a4a HZ |
341 | pfnsum += pfncurr; |
342 | pfnleft -= pfncurr; | |
3e7ee490 | 343 | } |
f4266e34 | 344 | } else { |
454f18a9 | 345 | /* everything fits in a header */ |
39d70a4a | 346 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 347 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
348 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
349 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
350 | if (msgheader == NULL) | |
e3eb7cdd | 351 | goto nomem; |
c50f7fb2 | 352 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
353 | |
354 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
355 | msgheader->msg; |
356 | gpadl_header->rangecount = 1; | |
357 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 358 | pagecount * sizeof(u64); |
415f2287 HZ |
359 | gpadl_header->range[0].byte_offset = 0; |
360 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 361 | for (i = 0; i < pagecount; i++) |
415f2287 | 362 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
363 | |
364 | *msginfo = msgheader; | |
365 | *messagecount = 1; | |
3e7ee490 HJ |
366 | } |
367 | ||
368 | return 0; | |
d1c250bb | 369 | nomem: |
39d70a4a HZ |
370 | kfree(msgheader); |
371 | kfree(msgbody); | |
d1c250bb | 372 | return -ENOMEM; |
3e7ee490 HJ |
373 | } |
374 | ||
3e189519 | 375 | /* |
fff41b2e | 376 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 377 | * |
39d70a4a HZ |
378 | * @channel: a channel |
379 | * @kbuffer: from kmalloc | |
380 | * @size: page-size multiple | |
381 | * @gpadl_handle: some funky thing | |
f4266e34 | 382 | */ |
fff41b2e | 383 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 384 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 385 | { |
39d70a4a HZ |
386 | struct vmbus_channel_gpadl_header *gpadlmsg; |
387 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
388 | struct vmbus_channel_msginfo *msginfo = NULL; |
389 | struct vmbus_channel_msginfo *submsginfo; | |
390 | u32 msgcount; | |
53af545b | 391 | struct list_head *curr; |
39d70a4a | 392 | u32 next_gpadl_handle; |
dd0813b6 | 393 | unsigned long flags; |
c3bf2e26 | 394 | int ret = 0; |
9568a193 | 395 | int t; |
3e7ee490 | 396 | |
da9fcb72 HZ |
397 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
398 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 399 | |
fff41b2e | 400 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
401 | if (ret) |
402 | return ret; | |
3e7ee490 | 403 | |
9568a193 | 404 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 405 | |
c50f7fb2 HZ |
406 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
407 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
408 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
409 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 410 | |
3e7ee490 | 411 | |
15b2f647 | 412 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 413 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 414 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 415 | |
15b2f647 | 416 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 417 | |
c6977677 | 418 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 419 | sizeof(*msginfo)); |
98e08702 | 420 | if (ret != 0) |
00d760b0 | 421 | goto cleanup; |
3e7ee490 | 422 | |
39d70a4a | 423 | if (msgcount > 1) { |
c50f7fb2 | 424 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 425 | |
39d70a4a HZ |
426 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
427 | gpadl_body = | |
c50f7fb2 | 428 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 429 | |
c50f7fb2 HZ |
430 | gpadl_body->header.msgtype = |
431 | CHANNELMSG_GPADL_BODY; | |
432 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 433 | |
c6977677 | 434 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 435 | submsginfo->msgsize - |
39d70a4a | 436 | sizeof(*submsginfo)); |
fd4dc88e | 437 | if (ret != 0) |
00d760b0 | 438 | goto cleanup; |
99259159 | 439 | |
3e7ee490 HJ |
440 | } |
441 | } | |
40961de3 | 442 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 443 | BUG_ON(t == 0); |
0c3b7b2f | 444 | |
3e7ee490 | 445 | |
454f18a9 | 446 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 447 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 448 | |
00d760b0 | 449 | cleanup: |
15b2f647 | 450 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 451 | list_del(&msginfo->msglistentry); |
15b2f647 | 452 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 453 | |
39d70a4a | 454 | kfree(msginfo); |
3e7ee490 HJ |
455 | return ret; |
456 | } | |
98873724 | 457 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 458 | |
3e189519 | 459 | /* |
fff41b2e | 460 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 461 | */ |
fff41b2e | 462 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 463 | { |
82250213 | 464 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 465 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 466 | unsigned long flags; |
9568a193 | 467 | int ret, t; |
3e7ee490 | 468 | |
f4266e34 GKH |
469 | info = kmalloc(sizeof(*info) + |
470 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
471 | if (!info) |
472 | return -ENOMEM; | |
3e7ee490 | 473 | |
9568a193 | 474 | init_completion(&info->waitevent); |
3e7ee490 | 475 | |
c50f7fb2 | 476 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 477 | |
c50f7fb2 HZ |
478 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
479 | msg->child_relid = channel->offermsg.child_relid; | |
480 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 481 | |
15b2f647 | 482 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 483 | list_add_tail(&info->msglistentry, |
da9fcb72 | 484 | &vmbus_connection.chn_msg_list); |
15b2f647 | 485 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 486 | ret = vmbus_post_msg(msg, |
f4266e34 | 487 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 488 | |
0c3b7b2f | 489 | BUG_ON(ret != 0); |
40961de3 | 490 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 491 | BUG_ON(t == 0); |
3e7ee490 | 492 | |
454f18a9 | 493 | /* Received a torndown response */ |
15b2f647 | 494 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 495 | list_del(&info->msglistentry); |
15b2f647 | 496 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 497 | |
8c69f52a | 498 | kfree(info); |
3e7ee490 HJ |
499 | return ret; |
500 | } | |
18726d7a | 501 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 502 | |
e68d2971 | 503 | static void vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 504 | { |
82250213 | 505 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 506 | int ret; |
dad76bf7 | 507 | unsigned long flags; |
3e7ee490 | 508 | |
e68d2971 S |
509 | channel->state = CHANNEL_OPEN_STATE; |
510 | channel->sc_creation_callback = NULL; | |
454f18a9 | 511 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 512 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 513 | channel->onchannel_callback = NULL; |
dad76bf7 | 514 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 515 | |
454f18a9 | 516 | /* Send a closing message */ |
3e7ee490 | 517 | |
e9a27a9f | 518 | msg = &channel->close_msg.msg; |
3e7ee490 | 519 | |
c50f7fb2 HZ |
520 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
521 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 522 | |
c6977677 | 523 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 524 | |
0c3b7b2f | 525 | BUG_ON(ret != 0); |
454f18a9 | 526 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 527 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 528 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 529 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 530 | |
454f18a9 | 531 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
532 | hv_ringbuffer_cleanup(&channel->outbound); |
533 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 534 | |
df3493e0 S |
535 | free_pages((unsigned long)channel->ringbuffer_pages, |
536 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 537 | |
3e7ee490 | 538 | |
3e7ee490 | 539 | } |
e68d2971 S |
540 | |
541 | /* | |
542 | * vmbus_close - Close the specified channel | |
543 | */ | |
544 | void vmbus_close(struct vmbus_channel *channel) | |
545 | { | |
546 | struct list_head *cur, *tmp; | |
547 | struct vmbus_channel *cur_channel; | |
548 | ||
549 | if (channel->primary_channel != NULL) { | |
550 | /* | |
551 | * We will only close sub-channels when | |
552 | * the primary is closed. | |
553 | */ | |
554 | return; | |
555 | } | |
556 | /* | |
557 | * Close all the sub-channels first and then close the | |
558 | * primary channel. | |
559 | */ | |
560 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
561 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
562 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
563 | continue; | |
564 | vmbus_close_internal(cur_channel); | |
565 | } | |
566 | /* | |
567 | * Now close the primary. | |
568 | */ | |
569 | vmbus_close_internal(channel); | |
570 | } | |
70bfa307 | 571 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 572 | |
c88c4e4c | 573 | /** |
fff41b2e | 574 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
575 | * @channel: Pointer to vmbus_channel structure. |
576 | * @buffer: Pointer to the buffer you want to receive the data into. | |
577 | * @bufferlen: Maximum size of what the the buffer will hold | |
578 | * @requestid: Identifier of the request | |
579 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
580 | * packet etc. |
581 | * | |
39d70a4a | 582 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
583 | * This will send the data unparsed to hyper-v. |
584 | * | |
585 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 586 | */ |
fff41b2e | 587 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
588 | u32 bufferlen, u64 requestid, |
589 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 590 | { |
8dc0a06a | 591 | struct vmpacket_descriptor desc; |
39d70a4a | 592 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 593 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
594 | struct scatterlist bufferlist[3]; |
595 | u64 aligned_data = 0; | |
f4266e34 | 596 | int ret; |
98fa8cf4 | 597 | bool signal = false; |
3e7ee490 | 598 | |
3e7ee490 | 599 | |
454f18a9 | 600 | /* Setup the descriptor */ |
415f2287 HZ |
601 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
602 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 603 | /* in 8-bytes granularity */ |
415f2287 HZ |
604 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
605 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
606 | desc.trans_id = requestid; | |
3e7ee490 | 607 | |
39d70a4a HZ |
608 | sg_init_table(bufferlist, 3); |
609 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
610 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
611 | sg_set_buf(&bufferlist[2], &aligned_data, | |
612 | packetlen_aligned - packetlen); | |
3e7ee490 | 613 | |
98fa8cf4 | 614 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 615 | |
98fa8cf4 | 616 | if (ret == 0 && signal) |
fff41b2e | 617 | vmbus_setevent(channel); |
3e7ee490 | 618 | |
3e7ee490 HJ |
619 | return ret; |
620 | } | |
fff41b2e | 621 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 622 | |
3e189519 | 623 | /* |
fff41b2e | 624 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 625 | * packets using a GPADL Direct packet type. |
f4266e34 | 626 | */ |
fff41b2e | 627 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
628 | struct hv_page_buffer pagebuffers[], |
629 | u32 pagecount, void *buffer, u32 bufferlen, | |
630 | u64 requestid) | |
3e7ee490 | 631 | { |
f4266e34 GKH |
632 | int ret; |
633 | int i; | |
430a8e9a | 634 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
635 | u32 descsize; |
636 | u32 packetlen; | |
637 | u32 packetlen_aligned; | |
638 | struct scatterlist bufferlist[3]; | |
639 | u64 aligned_data = 0; | |
98fa8cf4 | 640 | bool signal = false; |
3e7ee490 | 641 | |
39d70a4a | 642 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 643 | return -EINVAL; |
3e7ee490 | 644 | |
3e7ee490 | 645 | |
f4266e34 | 646 | /* |
430a8e9a | 647 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
648 | * largest size we support |
649 | */ | |
39d70a4a HZ |
650 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
651 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 652 | sizeof(struct hv_page_buffer)); |
39d70a4a | 653 | packetlen = descsize + bufferlen; |
73509681 | 654 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 655 | |
454f18a9 | 656 | /* Setup the descriptor */ |
415f2287 | 657 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 658 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
659 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
660 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
661 | desc.transactionid = requestid; | |
662 | desc.rangecount = pagecount; | |
663 | ||
664 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
665 | desc.range[i].len = pagebuffers[i].len; |
666 | desc.range[i].offset = pagebuffers[i].offset; | |
667 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
668 | } |
669 | ||
39d70a4a HZ |
670 | sg_init_table(bufferlist, 3); |
671 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
672 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
673 | sg_set_buf(&bufferlist[2], &aligned_data, | |
674 | packetlen_aligned - packetlen); | |
3e7ee490 | 675 | |
98fa8cf4 | 676 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 677 | |
98fa8cf4 | 678 | if (ret == 0 && signal) |
fff41b2e | 679 | vmbus_setevent(channel); |
3e7ee490 | 680 | |
3e7ee490 HJ |
681 | return ret; |
682 | } | |
713efeb4 | 683 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 684 | |
3e189519 | 685 | /* |
fff41b2e | 686 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 687 | * using a GPADL Direct packet type. |
f4266e34 | 688 | */ |
fff41b2e | 689 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
690 | struct hv_multipage_buffer *multi_pagebuffer, |
691 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 692 | { |
f4266e34 | 693 | int ret; |
430a8e9a | 694 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
695 | u32 descsize; |
696 | u32 packetlen; | |
697 | u32 packetlen_aligned; | |
698 | struct scatterlist bufferlist[3]; | |
699 | u64 aligned_data = 0; | |
98fa8cf4 | 700 | bool signal = false; |
ca623ad3 HZ |
701 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
702 | multi_pagebuffer->len); | |
3e7ee490 | 703 | |
3e7ee490 | 704 | |
39d70a4a | 705 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 706 | return -EINVAL; |
3e7ee490 | 707 | |
f4266e34 | 708 | /* |
430a8e9a | 709 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
710 | * the largest size we support |
711 | */ | |
39d70a4a HZ |
712 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
713 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 714 | sizeof(u64)); |
39d70a4a | 715 | packetlen = descsize + bufferlen; |
73509681 | 716 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 717 | |
3e7ee490 | 718 | |
454f18a9 | 719 | /* Setup the descriptor */ |
415f2287 | 720 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 721 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
722 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
723 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
724 | desc.transactionid = requestid; | |
430a8e9a | 725 | desc.rangecount = 1; |
3e7ee490 | 726 | |
ca623ad3 HZ |
727 | desc.range.len = multi_pagebuffer->len; |
728 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 729 | |
ca623ad3 | 730 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 731 | pfncount * sizeof(u64)); |
3e7ee490 | 732 | |
39d70a4a HZ |
733 | sg_init_table(bufferlist, 3); |
734 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
735 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
736 | sg_set_buf(&bufferlist[2], &aligned_data, | |
737 | packetlen_aligned - packetlen); | |
3e7ee490 | 738 | |
98fa8cf4 | 739 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 740 | |
98fa8cf4 | 741 | if (ret == 0 && signal) |
fff41b2e | 742 | vmbus_setevent(channel); |
3e7ee490 | 743 | |
3e7ee490 HJ |
744 | return ret; |
745 | } | |
4cb106fa | 746 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
747 | |
748 | /** | |
fff41b2e | 749 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
750 | * @channel: Pointer to vmbus_channel structure. |
751 | * @buffer: Pointer to the buffer you want to receive the data into. | |
752 | * @bufferlen: Maximum size of what the the buffer will hold | |
753 | * @buffer_actual_len: The actual size of the data after it was received | |
754 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
755 | * |
756 | * Receives directly from the hyper-v vmbus and puts the data it received | |
757 | * into Buffer. This will receive the data unparsed from hyper-v. | |
758 | * | |
759 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 760 | */ |
fff41b2e | 761 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 762 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 763 | { |
8dc0a06a | 764 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
765 | u32 packetlen; |
766 | u32 userlen; | |
3e7ee490 | 767 | int ret; |
c2b8e520 | 768 | bool signal = false; |
3e7ee490 | 769 | |
39d70a4a HZ |
770 | *buffer_actual_len = 0; |
771 | *requestid = 0; | |
3e7ee490 | 772 | |
3e7ee490 | 773 | |
a89186c2 | 774 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 775 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 776 | if (ret != 0) |
3e7ee490 | 777 | return 0; |
3e7ee490 | 778 | |
415f2287 HZ |
779 | packetlen = desc.len8 << 3; |
780 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 781 | |
39d70a4a | 782 | *buffer_actual_len = userlen; |
3e7ee490 | 783 | |
39d70a4a | 784 | if (userlen > bufferlen) { |
3e7ee490 | 785 | |
0a46618d | 786 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 787 | bufferlen, userlen); |
926ae526 | 788 | return -ETOOSMALL; |
3e7ee490 HJ |
789 | } |
790 | ||
415f2287 | 791 | *requestid = desc.trans_id; |
3e7ee490 | 792 | |
454f18a9 | 793 | /* Copy over the packet to the user buffer */ |
38397c8a | 794 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 795 | (desc.offset8 << 3), &signal); |
3e7ee490 | 796 | |
c2b8e520 S |
797 | if (signal) |
798 | vmbus_setevent(channel); | |
3e7ee490 | 799 | |
3e7ee490 HJ |
800 | return 0; |
801 | } | |
fff41b2e | 802 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 803 | |
3e189519 | 804 | /* |
fff41b2e | 805 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 806 | */ |
fff41b2e | 807 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
808 | u32 bufferlen, u32 *buffer_actual_len, |
809 | u64 *requestid) | |
3e7ee490 | 810 | { |
8dc0a06a | 811 | struct vmpacket_descriptor desc; |
39d70a4a | 812 | u32 packetlen; |
3e7ee490 | 813 | int ret; |
c2b8e520 | 814 | bool signal = false; |
3e7ee490 | 815 | |
39d70a4a HZ |
816 | *buffer_actual_len = 0; |
817 | *requestid = 0; | |
3e7ee490 | 818 | |
3e7ee490 | 819 | |
a89186c2 | 820 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 821 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 822 | if (ret != 0) |
3e7ee490 | 823 | return 0; |
3e7ee490 | 824 | |
3e7ee490 | 825 | |
415f2287 | 826 | packetlen = desc.len8 << 3; |
3e7ee490 | 827 | |
39d70a4a | 828 | *buffer_actual_len = packetlen; |
3e7ee490 | 829 | |
39d70a4a | 830 | if (packetlen > bufferlen) { |
0a46618d HJ |
831 | pr_err("Buffer too small - needed %d bytes but " |
832 | "got space for only %d bytes\n", | |
833 | packetlen, bufferlen); | |
3d5cad97 | 834 | return -ENOBUFS; |
3e7ee490 HJ |
835 | } |
836 | ||
415f2287 | 837 | *requestid = desc.trans_id; |
3e7ee490 | 838 | |
454f18a9 | 839 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
840 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
841 | &signal); | |
842 | ||
843 | if (signal) | |
844 | vmbus_setevent(channel); | |
3e7ee490 | 845 | |
3e7ee490 HJ |
846 | return 0; |
847 | } | |
adaee6bd | 848 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |