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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> |
3f335ea2 | 31 | |
0f2a6619 | 32 | #include "hyperv_vmbus.h" |
3e7ee490 | 33 | |
e3fe0bb6 S |
34 | #define NUM_PAGES_SPANNED(addr, len) \ |
35 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
36 | ||
3e189519 | 37 | /* |
fff41b2e | 38 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 39 | * channel. |
f4266e34 | 40 | */ |
fff41b2e | 41 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 42 | { |
39d70a4a | 43 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 44 | |
c50f7fb2 | 45 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 46 | /* Each u32 represents 32 channels */ |
22356585 | 47 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 48 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 49 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 50 | |
8681db44 GKH |
51 | /* Get the child to parent monitor page */ |
52 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 53 | |
22356585 | 54 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
55 | (unsigned long *)&monitorpage->trigger_group |
56 | [channel->monitor_grp].pending); | |
7c369f40 | 57 | |
f4266e34 | 58 | } else { |
21c3bef5 | 59 | vmbus_set_event(channel); |
3e7ee490 | 60 | } |
3e7ee490 HJ |
61 | } |
62 | ||
3e189519 | 63 | /* |
fff41b2e | 64 | * vmbus_open - Open the specified channel. |
f4266e34 | 65 | */ |
fff41b2e | 66 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
67 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
68 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 69 | { |
0987ff69 | 70 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 71 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 72 | void *in, *out; |
dd0813b6 | 73 | unsigned long flags; |
9568a193 | 74 | int ret, t, err = 0; |
3e7ee490 | 75 | |
67fae053 | 76 | spin_lock_irqsave(&newchannel->lock, flags); |
e68d2971 S |
77 | if (newchannel->state == CHANNEL_OPEN_STATE) { |
78 | newchannel->state = CHANNEL_OPENING_STATE; | |
79 | } else { | |
67fae053 | 80 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 S |
81 | return -EINVAL; |
82 | } | |
67fae053 | 83 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 | 84 | |
c50f7fb2 HZ |
85 | newchannel->onchannel_callback = onchannelcallback; |
86 | newchannel->channel_callback_context = context; | |
3e7ee490 | 87 | |
454f18a9 | 88 | /* Allocate the ring buffer */ |
df3493e0 S |
89 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
90 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
91 | ||
ac0d12b7 DC |
92 | if (!out) { |
93 | err = -ENOMEM; | |
94 | goto error0; | |
95 | } | |
3e7ee490 | 96 | |
39d70a4a | 97 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 98 | |
c50f7fb2 HZ |
99 | newchannel->ringbuffer_pages = out; |
100 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 101 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 102 | |
72a95cbc S |
103 | ret = hv_ringbuffer_init( |
104 | &newchannel->outbound, out, send_ringbuffer_size); | |
105 | ||
fd4dc88e | 106 | if (ret != 0) { |
3324fb40 | 107 | err = ret; |
13925502 | 108 | goto error0; |
3324fb40 BP |
109 | } |
110 | ||
72a95cbc S |
111 | ret = hv_ringbuffer_init( |
112 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 113 | if (ret != 0) { |
3324fb40 | 114 | err = ret; |
13925502 | 115 | goto error0; |
3324fb40 | 116 | } |
3e7ee490 | 117 | |
3e7ee490 | 118 | |
454f18a9 | 119 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 120 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 121 | |
fff41b2e | 122 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 123 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
124 | send_ringbuffer_size + |
125 | recv_ringbuffer_size, | |
c50f7fb2 | 126 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 127 | |
fd4dc88e | 128 | if (ret != 0) { |
b94ef345 | 129 | err = ret; |
13925502 | 130 | goto error0; |
b94ef345 | 131 | } |
f4266e34 | 132 | |
454f18a9 | 133 | /* Create and init the channel open message */ |
176fb9e3 | 134 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
135 | sizeof(struct vmbus_channel_open_channel), |
136 | GFP_KERNEL); | |
176fb9e3 | 137 | if (!open_info) { |
c3bf2e26 | 138 | err = -ENOMEM; |
13925502 | 139 | goto error0; |
c3bf2e26 | 140 | } |
3e7ee490 | 141 | |
176fb9e3 | 142 | init_completion(&open_info->waitevent); |
3e7ee490 | 143 | |
176fb9e3 | 144 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
145 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
146 | open_msg->openid = newchannel->offermsg.child_relid; | |
147 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
148 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
149 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 150 | PAGE_SHIFT; |
abbf3b2a | 151 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 152 | |
39d70a4a | 153 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 154 | err = -EINVAL; |
13925502 | 155 | goto error0; |
c827f944 BP |
156 | } |
157 | ||
39d70a4a | 158 | if (userdatalen) |
0987ff69 | 159 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 160 | |
15b2f647 | 161 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 162 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 163 | &vmbus_connection.chn_msg_list); |
15b2f647 | 164 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 165 | |
0987ff69 | 166 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 167 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 | 168 | |
45d727ce S |
169 | if (ret != 0) { |
170 | err = ret; | |
13925502 | 171 | goto error1; |
45d727ce | 172 | } |
3e7ee490 | 173 | |
176fb9e3 | 174 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 175 | if (t == 0) { |
0c3b7b2f | 176 | err = -ETIMEDOUT; |
13925502 | 177 | goto error1; |
0c3b7b2f S |
178 | } |
179 | ||
3e7ee490 | 180 | |
176fb9e3 S |
181 | if (open_info->response.open_result.status) |
182 | err = open_info->response.open_result.status; | |
3e7ee490 | 183 | |
15b2f647 | 184 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 185 | list_del(&open_info->msglistentry); |
15b2f647 | 186 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 187 | |
e68d2971 S |
188 | if (err == 0) |
189 | newchannel->state = CHANNEL_OPENED_STATE; | |
190 | ||
176fb9e3 | 191 | kfree(open_info); |
98e08702 | 192 | return err; |
c3bf2e26 | 193 | |
13925502 S |
194 | error1: |
195 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
196 | list_del(&open_info->msglistentry); | |
197 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
198 | ||
199 | error0: | |
df3493e0 S |
200 | free_pages((unsigned long)out, |
201 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 202 | kfree(open_info); |
ac0d12b7 | 203 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 204 | return err; |
3e7ee490 | 205 | } |
36ceadfc | 206 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 207 | |
3e189519 | 208 | /* |
fff41b2e | 209 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 210 | */ |
fff41b2e | 211 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
212 | struct vmbus_channel_msginfo **msginfo, |
213 | u32 *messagecount) | |
3e7ee490 HJ |
214 | { |
215 | int i; | |
39d70a4a | 216 | int pagecount; |
39d70a4a HZ |
217 | struct vmbus_channel_gpadl_header *gpadl_header; |
218 | struct vmbus_channel_gpadl_body *gpadl_body; | |
219 | struct vmbus_channel_msginfo *msgheader; | |
220 | struct vmbus_channel_msginfo *msgbody = NULL; | |
221 | u32 msgsize; | |
3e7ee490 | 222 | |
39d70a4a | 223 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 224 | |
39d70a4a | 225 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 226 | |
454f18a9 | 227 | /* do we need a gpadl body msg */ |
39d70a4a | 228 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
229 | sizeof(struct vmbus_channel_gpadl_header) - |
230 | sizeof(struct gpa_range); | |
39d70a4a | 231 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 232 | |
39d70a4a | 233 | if (pagecount > pfncount) { |
f4266e34 | 234 | /* we need a gpadl body */ |
454f18a9 | 235 | /* fill in the header */ |
39d70a4a | 236 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 237 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
238 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
239 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
240 | if (!msgheader) | |
d1c250bb | 241 | goto nomem; |
3e7ee490 | 242 | |
c50f7fb2 HZ |
243 | INIT_LIST_HEAD(&msgheader->submsglist); |
244 | msgheader->msgsize = msgsize; | |
3e7ee490 | 245 | |
39d70a4a | 246 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
247 | msgheader->msg; |
248 | gpadl_header->rangecount = 1; | |
249 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 250 | pagecount * sizeof(u64); |
415f2287 HZ |
251 | gpadl_header->range[0].byte_offset = 0; |
252 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 253 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
254 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
255 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
256 | *msginfo = msgheader; |
257 | *messagecount = 1; | |
3e7ee490 | 258 | |
39d70a4a HZ |
259 | pfnsum = pfncount; |
260 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 261 | |
454f18a9 | 262 | /* how many pfns can we fit */ |
39d70a4a | 263 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 264 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 265 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 266 | |
454f18a9 | 267 | /* fill in the body */ |
39d70a4a HZ |
268 | while (pfnleft) { |
269 | if (pfnleft > pfncount) | |
270 | pfncurr = pfncount; | |
3e7ee490 | 271 | else |
39d70a4a | 272 | pfncurr = pfnleft; |
3e7ee490 | 273 | |
39d70a4a | 274 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 275 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
276 | pfncurr * sizeof(u64); |
277 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
278 | |
279 | if (!msgbody) { | |
280 | struct vmbus_channel_msginfo *pos = NULL; | |
281 | struct vmbus_channel_msginfo *tmp = NULL; | |
282 | /* | |
283 | * Free up all the allocated messages. | |
284 | */ | |
285 | list_for_each_entry_safe(pos, tmp, | |
286 | &msgheader->submsglist, | |
287 | msglistentry) { | |
288 | ||
289 | list_del(&pos->msglistentry); | |
290 | kfree(pos); | |
291 | } | |
292 | ||
d1c250bb | 293 | goto nomem; |
f38cf9cc S |
294 | } |
295 | ||
c50f7fb2 | 296 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
297 | (*messagecount)++; |
298 | gpadl_body = | |
c50f7fb2 | 299 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
300 | |
301 | /* | |
f4266e34 GKH |
302 | * Gpadl is u32 and we are using a pointer which could |
303 | * be 64-bit | |
f27df643 S |
304 | * This is governed by the guest/host protocol and |
305 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 306 | */ |
39d70a4a | 307 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
308 | gpadl_body->pfn[i] = slow_virt_to_phys( |
309 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
310 | PAGE_SHIFT; | |
3e7ee490 | 311 | |
454f18a9 | 312 | /* add to msg header */ |
c50f7fb2 HZ |
313 | list_add_tail(&msgbody->msglistentry, |
314 | &msgheader->submsglist); | |
39d70a4a HZ |
315 | pfnsum += pfncurr; |
316 | pfnleft -= pfncurr; | |
3e7ee490 | 317 | } |
f4266e34 | 318 | } else { |
454f18a9 | 319 | /* everything fits in a header */ |
39d70a4a | 320 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 321 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
322 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
323 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
324 | if (msgheader == NULL) | |
e3eb7cdd | 325 | goto nomem; |
c50f7fb2 | 326 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
327 | |
328 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
329 | msgheader->msg; |
330 | gpadl_header->rangecount = 1; | |
331 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 332 | pagecount * sizeof(u64); |
415f2287 HZ |
333 | gpadl_header->range[0].byte_offset = 0; |
334 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 335 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
336 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
337 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
338 | |
339 | *msginfo = msgheader; | |
340 | *messagecount = 1; | |
3e7ee490 HJ |
341 | } |
342 | ||
343 | return 0; | |
d1c250bb | 344 | nomem: |
39d70a4a HZ |
345 | kfree(msgheader); |
346 | kfree(msgbody); | |
d1c250bb | 347 | return -ENOMEM; |
3e7ee490 HJ |
348 | } |
349 | ||
3e189519 | 350 | /* |
fff41b2e | 351 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 352 | * |
39d70a4a | 353 | * @channel: a channel |
b679ef73 | 354 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
355 | * @size: page-size multiple |
356 | * @gpadl_handle: some funky thing | |
f4266e34 | 357 | */ |
fff41b2e | 358 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 359 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 360 | { |
39d70a4a HZ |
361 | struct vmbus_channel_gpadl_header *gpadlmsg; |
362 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
363 | struct vmbus_channel_msginfo *msginfo = NULL; |
364 | struct vmbus_channel_msginfo *submsginfo; | |
365 | u32 msgcount; | |
53af545b | 366 | struct list_head *curr; |
39d70a4a | 367 | u32 next_gpadl_handle; |
dd0813b6 | 368 | unsigned long flags; |
c3bf2e26 | 369 | int ret = 0; |
3e7ee490 | 370 | |
9f52a163 S |
371 | next_gpadl_handle = |
372 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 373 | |
fff41b2e | 374 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
375 | if (ret) |
376 | return ret; | |
3e7ee490 | 377 | |
9568a193 | 378 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 379 | |
c50f7fb2 HZ |
380 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
381 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
382 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
383 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 384 | |
3e7ee490 | 385 | |
15b2f647 | 386 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 387 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 388 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 389 | |
15b2f647 | 390 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 391 | |
c6977677 | 392 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 393 | sizeof(*msginfo)); |
98e08702 | 394 | if (ret != 0) |
00d760b0 | 395 | goto cleanup; |
3e7ee490 | 396 | |
39d70a4a | 397 | if (msgcount > 1) { |
c50f7fb2 | 398 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 399 | |
39d70a4a HZ |
400 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
401 | gpadl_body = | |
c50f7fb2 | 402 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 403 | |
c50f7fb2 HZ |
404 | gpadl_body->header.msgtype = |
405 | CHANNELMSG_GPADL_BODY; | |
406 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 407 | |
c6977677 | 408 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 409 | submsginfo->msgsize - |
39d70a4a | 410 | sizeof(*submsginfo)); |
fd4dc88e | 411 | if (ret != 0) |
00d760b0 | 412 | goto cleanup; |
99259159 | 413 | |
3e7ee490 HJ |
414 | } |
415 | } | |
72c6b71c | 416 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 417 | |
454f18a9 | 418 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 419 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 420 | |
00d760b0 | 421 | cleanup: |
15b2f647 | 422 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 423 | list_del(&msginfo->msglistentry); |
15b2f647 | 424 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 425 | |
39d70a4a | 426 | kfree(msginfo); |
3e7ee490 HJ |
427 | return ret; |
428 | } | |
98873724 | 429 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 430 | |
3e189519 | 431 | /* |
fff41b2e | 432 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 433 | */ |
fff41b2e | 434 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 435 | { |
82250213 | 436 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 437 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 438 | unsigned long flags; |
66be6530 | 439 | int ret; |
3e7ee490 | 440 | |
f4266e34 GKH |
441 | info = kmalloc(sizeof(*info) + |
442 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
443 | if (!info) |
444 | return -ENOMEM; | |
3e7ee490 | 445 | |
9568a193 | 446 | init_completion(&info->waitevent); |
3e7ee490 | 447 | |
c50f7fb2 | 448 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 449 | |
c50f7fb2 HZ |
450 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
451 | msg->child_relid = channel->offermsg.child_relid; | |
452 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 453 | |
15b2f647 | 454 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 455 | list_add_tail(&info->msglistentry, |
da9fcb72 | 456 | &vmbus_connection.chn_msg_list); |
15b2f647 | 457 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 458 | ret = vmbus_post_msg(msg, |
f4266e34 | 459 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 460 | |
66be6530 S |
461 | if (ret) |
462 | goto post_msg_err; | |
463 | ||
464 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 465 | |
66be6530 | 466 | post_msg_err: |
15b2f647 | 467 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 468 | list_del(&info->msglistentry); |
15b2f647 | 469 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 470 | |
8c69f52a | 471 | kfree(info); |
3e7ee490 HJ |
472 | return ret; |
473 | } | |
18726d7a | 474 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 475 | |
d3ba720d S |
476 | static void reset_channel_cb(void *arg) |
477 | { | |
478 | struct vmbus_channel *channel = arg; | |
479 | ||
480 | channel->onchannel_callback = NULL; | |
481 | } | |
482 | ||
98d731bb | 483 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 484 | { |
82250213 | 485 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 486 | int ret; |
3e7ee490 | 487 | |
e68d2971 S |
488 | channel->state = CHANNEL_OPEN_STATE; |
489 | channel->sc_creation_callback = NULL; | |
454f18a9 | 490 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
491 | if (channel->target_cpu != get_cpu()) { |
492 | put_cpu(); | |
d3ba720d S |
493 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
494 | channel, true); | |
2115b561 | 495 | } else { |
d3ba720d | 496 | reset_channel_cb(channel); |
2115b561 S |
497 | put_cpu(); |
498 | } | |
3e7ee490 | 499 | |
454f18a9 | 500 | /* Send a closing message */ |
3e7ee490 | 501 | |
e9a27a9f | 502 | msg = &channel->close_msg.msg; |
3e7ee490 | 503 | |
c50f7fb2 HZ |
504 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
505 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 506 | |
c6977677 | 507 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 508 | |
98d731bb S |
509 | if (ret) { |
510 | pr_err("Close failed: close post msg return is %d\n", ret); | |
511 | /* | |
512 | * If we failed to post the close msg, | |
513 | * it is perhaps better to leak memory. | |
514 | */ | |
515 | return ret; | |
516 | } | |
517 | ||
454f18a9 | 518 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
519 | if (channel->ringbuffer_gpadlhandle) { |
520 | ret = vmbus_teardown_gpadl(channel, | |
521 | channel->ringbuffer_gpadlhandle); | |
522 | if (ret) { | |
523 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
524 | /* | |
525 | * If we failed to teardown gpadl, | |
526 | * it is perhaps better to leak memory. | |
527 | */ | |
528 | return ret; | |
529 | } | |
530 | } | |
3e7ee490 | 531 | |
454f18a9 | 532 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
533 | hv_ringbuffer_cleanup(&channel->outbound); |
534 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 535 | |
df3493e0 S |
536 | free_pages((unsigned long)channel->ringbuffer_pages, |
537 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 538 | |
98d731bb | 539 | return ret; |
3e7ee490 | 540 | } |
e68d2971 S |
541 | |
542 | /* | |
543 | * vmbus_close - Close the specified channel | |
544 | */ | |
545 | void vmbus_close(struct vmbus_channel *channel) | |
546 | { | |
547 | struct list_head *cur, *tmp; | |
548 | struct vmbus_channel *cur_channel; | |
549 | ||
550 | if (channel->primary_channel != NULL) { | |
551 | /* | |
552 | * We will only close sub-channels when | |
553 | * the primary is closed. | |
554 | */ | |
555 | return; | |
556 | } | |
557 | /* | |
558 | * Close all the sub-channels first and then close the | |
559 | * primary channel. | |
560 | */ | |
561 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
562 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
563 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
564 | continue; | |
565 | vmbus_close_internal(cur_channel); | |
566 | } | |
567 | /* | |
568 | * Now close the primary. | |
569 | */ | |
570 | vmbus_close_internal(channel); | |
571 | } | |
70bfa307 | 572 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 573 | |
c88c4e4c | 574 | /** |
fff41b2e | 575 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
576 | * @channel: Pointer to vmbus_channel structure. |
577 | * @buffer: Pointer to the buffer you want to receive the data into. | |
578 | * @bufferlen: Maximum size of what the the buffer will hold | |
579 | * @requestid: Identifier of the request | |
580 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
581 | * packet etc. |
582 | * | |
39d70a4a | 583 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
584 | * This will send the data unparsed to hyper-v. |
585 | * | |
586 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 587 | */ |
011a7c3c | 588 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
589 | u32 bufferlen, u64 requestid, |
590 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 591 | { |
8dc0a06a | 592 | struct vmpacket_descriptor desc; |
39d70a4a | 593 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 594 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 595 | struct kvec bufferlist[3]; |
39d70a4a | 596 | u64 aligned_data = 0; |
f4266e34 | 597 | int ret; |
98fa8cf4 | 598 | bool signal = false; |
3e7ee490 | 599 | |
3e7ee490 | 600 | |
454f18a9 | 601 | /* Setup the descriptor */ |
415f2287 HZ |
602 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
603 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 604 | /* in 8-bytes granularity */ |
415f2287 HZ |
605 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
606 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
607 | desc.trans_id = requestid; | |
3e7ee490 | 608 | |
011a7c3c S |
609 | bufferlist[0].iov_base = &desc; |
610 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
611 | bufferlist[1].iov_base = buffer; | |
612 | bufferlist[1].iov_len = bufferlen; | |
613 | bufferlist[2].iov_base = &aligned_data; | |
614 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 615 | |
98fa8cf4 | 616 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 617 | |
98fa8cf4 | 618 | if (ret == 0 && signal) |
fff41b2e | 619 | vmbus_setevent(channel); |
3e7ee490 | 620 | |
3e7ee490 HJ |
621 | return ret; |
622 | } | |
fff41b2e | 623 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 624 | |
3e189519 | 625 | /* |
fff41b2e | 626 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 627 | * packets using a GPADL Direct packet type. |
f4266e34 | 628 | */ |
fff41b2e | 629 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
630 | struct hv_page_buffer pagebuffers[], |
631 | u32 pagecount, void *buffer, u32 bufferlen, | |
632 | u64 requestid) | |
3e7ee490 | 633 | { |
f4266e34 GKH |
634 | int ret; |
635 | int i; | |
430a8e9a | 636 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
637 | u32 descsize; |
638 | u32 packetlen; | |
639 | u32 packetlen_aligned; | |
011a7c3c | 640 | struct kvec bufferlist[3]; |
39d70a4a | 641 | u64 aligned_data = 0; |
98fa8cf4 | 642 | bool signal = false; |
3e7ee490 | 643 | |
39d70a4a | 644 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 645 | return -EINVAL; |
3e7ee490 | 646 | |
3e7ee490 | 647 | |
f4266e34 | 648 | /* |
430a8e9a | 649 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
650 | * largest size we support |
651 | */ | |
39d70a4a HZ |
652 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
653 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 654 | sizeof(struct hv_page_buffer)); |
39d70a4a | 655 | packetlen = descsize + bufferlen; |
73509681 | 656 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 657 | |
454f18a9 | 658 | /* Setup the descriptor */ |
415f2287 | 659 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 660 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
661 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
662 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
663 | desc.transactionid = requestid; | |
664 | desc.rangecount = pagecount; | |
665 | ||
666 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
667 | desc.range[i].len = pagebuffers[i].len; |
668 | desc.range[i].offset = pagebuffers[i].offset; | |
669 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
670 | } |
671 | ||
011a7c3c S |
672 | bufferlist[0].iov_base = &desc; |
673 | bufferlist[0].iov_len = descsize; | |
674 | bufferlist[1].iov_base = buffer; | |
675 | bufferlist[1].iov_len = bufferlen; | |
676 | bufferlist[2].iov_base = &aligned_data; | |
677 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 678 | |
98fa8cf4 | 679 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 680 | |
98fa8cf4 | 681 | if (ret == 0 && signal) |
fff41b2e | 682 | vmbus_setevent(channel); |
3e7ee490 | 683 | |
3e7ee490 HJ |
684 | return ret; |
685 | } | |
713efeb4 | 686 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 687 | |
d61031ee S |
688 | /* |
689 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
690 | * using a GPADL Direct packet type. | |
691 | * The buffer includes the vmbus descriptor. | |
692 | */ | |
693 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
694 | struct vmbus_packet_mpb_array *desc, | |
695 | u32 desc_size, | |
696 | void *buffer, u32 bufferlen, u64 requestid) | |
697 | { | |
698 | int ret; | |
699 | u32 packetlen; | |
700 | u32 packetlen_aligned; | |
701 | struct kvec bufferlist[3]; | |
702 | u64 aligned_data = 0; | |
703 | bool signal = false; | |
704 | ||
705 | packetlen = desc_size + bufferlen; | |
706 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
707 | ||
708 | /* Setup the descriptor */ | |
709 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
710 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
711 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
712 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
713 | desc->transactionid = requestid; | |
714 | desc->rangecount = 1; | |
715 | ||
716 | bufferlist[0].iov_base = desc; | |
717 | bufferlist[0].iov_len = desc_size; | |
718 | bufferlist[1].iov_base = buffer; | |
719 | bufferlist[1].iov_len = bufferlen; | |
720 | bufferlist[2].iov_base = &aligned_data; | |
721 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
722 | ||
723 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); | |
724 | ||
725 | if (ret == 0 && signal) | |
726 | vmbus_setevent(channel); | |
727 | ||
728 | return ret; | |
729 | } | |
730 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
731 | ||
3e189519 | 732 | /* |
fff41b2e | 733 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 734 | * using a GPADL Direct packet type. |
f4266e34 | 735 | */ |
fff41b2e | 736 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
737 | struct hv_multipage_buffer *multi_pagebuffer, |
738 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 739 | { |
f4266e34 | 740 | int ret; |
430a8e9a | 741 | struct vmbus_channel_packet_multipage_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; |
98fa8cf4 | 747 | bool signal = false; |
ca623ad3 HZ |
748 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
749 | multi_pagebuffer->len); | |
3e7ee490 | 750 | |
24b8a406 | 751 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 752 | return -EINVAL; |
3e7ee490 | 753 | |
f4266e34 | 754 | /* |
430a8e9a | 755 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
756 | * the largest size we support |
757 | */ | |
39d70a4a HZ |
758 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
759 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 760 | sizeof(u64)); |
39d70a4a | 761 | packetlen = descsize + bufferlen; |
73509681 | 762 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 763 | |
3e7ee490 | 764 | |
454f18a9 | 765 | /* Setup the descriptor */ |
415f2287 | 766 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 767 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
768 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
769 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
770 | desc.transactionid = requestid; | |
430a8e9a | 771 | desc.rangecount = 1; |
3e7ee490 | 772 | |
ca623ad3 HZ |
773 | desc.range.len = multi_pagebuffer->len; |
774 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 775 | |
ca623ad3 | 776 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 777 | pfncount * sizeof(u64)); |
3e7ee490 | 778 | |
011a7c3c S |
779 | bufferlist[0].iov_base = &desc; |
780 | bufferlist[0].iov_len = descsize; | |
781 | bufferlist[1].iov_base = buffer; | |
782 | bufferlist[1].iov_len = bufferlen; | |
783 | bufferlist[2].iov_base = &aligned_data; | |
784 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 785 | |
98fa8cf4 | 786 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 787 | |
98fa8cf4 | 788 | if (ret == 0 && signal) |
fff41b2e | 789 | vmbus_setevent(channel); |
3e7ee490 | 790 | |
3e7ee490 HJ |
791 | return ret; |
792 | } | |
4cb106fa | 793 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
794 | |
795 | /** | |
fff41b2e | 796 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
797 | * @channel: Pointer to vmbus_channel structure. |
798 | * @buffer: Pointer to the buffer you want to receive the data into. | |
799 | * @bufferlen: Maximum size of what the the buffer will hold | |
800 | * @buffer_actual_len: The actual size of the data after it was received | |
801 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
802 | * |
803 | * Receives directly from the hyper-v vmbus and puts the data it received | |
804 | * into Buffer. This will receive the data unparsed from hyper-v. | |
805 | * | |
806 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 807 | */ |
fff41b2e | 808 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 809 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 810 | { |
8dc0a06a | 811 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
812 | u32 packetlen; |
813 | u32 userlen; | |
3e7ee490 | 814 | int ret; |
c2b8e520 | 815 | bool signal = false; |
3e7ee490 | 816 | |
39d70a4a HZ |
817 | *buffer_actual_len = 0; |
818 | *requestid = 0; | |
3e7ee490 | 819 | |
3e7ee490 | 820 | |
a89186c2 | 821 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 822 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 823 | if (ret != 0) |
3e7ee490 | 824 | return 0; |
3e7ee490 | 825 | |
415f2287 HZ |
826 | packetlen = desc.len8 << 3; |
827 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 828 | |
39d70a4a | 829 | *buffer_actual_len = userlen; |
3e7ee490 | 830 | |
39d70a4a | 831 | if (userlen > bufferlen) { |
3e7ee490 | 832 | |
0a46618d | 833 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 834 | bufferlen, userlen); |
926ae526 | 835 | return -ETOOSMALL; |
3e7ee490 HJ |
836 | } |
837 | ||
415f2287 | 838 | *requestid = desc.trans_id; |
3e7ee490 | 839 | |
454f18a9 | 840 | /* Copy over the packet to the user buffer */ |
38397c8a | 841 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 842 | (desc.offset8 << 3), &signal); |
3e7ee490 | 843 | |
c2b8e520 S |
844 | if (signal) |
845 | vmbus_setevent(channel); | |
3e7ee490 | 846 | |
3e7ee490 HJ |
847 | return 0; |
848 | } | |
fff41b2e | 849 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 850 | |
3e189519 | 851 | /* |
fff41b2e | 852 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 853 | */ |
fff41b2e | 854 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
855 | u32 bufferlen, u32 *buffer_actual_len, |
856 | u64 *requestid) | |
3e7ee490 | 857 | { |
8dc0a06a | 858 | struct vmpacket_descriptor desc; |
39d70a4a | 859 | u32 packetlen; |
3e7ee490 | 860 | int ret; |
c2b8e520 | 861 | bool signal = false; |
3e7ee490 | 862 | |
39d70a4a HZ |
863 | *buffer_actual_len = 0; |
864 | *requestid = 0; | |
3e7ee490 | 865 | |
3e7ee490 | 866 | |
a89186c2 | 867 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 868 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 869 | if (ret != 0) |
3e7ee490 | 870 | return 0; |
3e7ee490 | 871 | |
3e7ee490 | 872 | |
415f2287 | 873 | packetlen = desc.len8 << 3; |
3e7ee490 | 874 | |
39d70a4a | 875 | *buffer_actual_len = packetlen; |
3e7ee490 | 876 | |
7a446d63 | 877 | if (packetlen > bufferlen) |
3d5cad97 | 878 | return -ENOBUFS; |
3e7ee490 | 879 | |
415f2287 | 880 | *requestid = desc.trans_id; |
3e7ee490 | 881 | |
454f18a9 | 882 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
883 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
884 | &signal); | |
885 | ||
886 | if (signal) | |
887 | vmbus_setevent(channel); | |
3e7ee490 | 888 | |
33b06938 | 889 | return ret; |
3e7ee490 | 890 | } |
adaee6bd | 891 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |