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> |
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; |
08a9513f NMG |
74 | int ret, err = 0; |
75 | unsigned long t; | |
3e7ee490 | 76 | |
67fae053 | 77 | spin_lock_irqsave(&newchannel->lock, flags); |
e68d2971 S |
78 | if (newchannel->state == CHANNEL_OPEN_STATE) { |
79 | newchannel->state = CHANNEL_OPENING_STATE; | |
80 | } else { | |
67fae053 | 81 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 S |
82 | return -EINVAL; |
83 | } | |
67fae053 | 84 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 | 85 | |
c50f7fb2 HZ |
86 | newchannel->onchannel_callback = onchannelcallback; |
87 | newchannel->channel_callback_context = context; | |
3e7ee490 | 88 | |
454f18a9 | 89 | /* Allocate the ring buffer */ |
df3493e0 S |
90 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
91 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
92 | ||
ac0d12b7 DC |
93 | if (!out) { |
94 | err = -ENOMEM; | |
95 | goto error0; | |
96 | } | |
3e7ee490 | 97 | |
39d70a4a | 98 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 99 | |
c50f7fb2 HZ |
100 | newchannel->ringbuffer_pages = out; |
101 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 102 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 103 | |
72a95cbc S |
104 | ret = hv_ringbuffer_init( |
105 | &newchannel->outbound, out, send_ringbuffer_size); | |
106 | ||
fd4dc88e | 107 | if (ret != 0) { |
3324fb40 | 108 | err = ret; |
13925502 | 109 | goto error0; |
3324fb40 BP |
110 | } |
111 | ||
72a95cbc S |
112 | ret = hv_ringbuffer_init( |
113 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 114 | if (ret != 0) { |
3324fb40 | 115 | err = ret; |
13925502 | 116 | goto error0; |
3324fb40 | 117 | } |
3e7ee490 | 118 | |
3e7ee490 | 119 | |
454f18a9 | 120 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 121 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 122 | |
fff41b2e | 123 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 124 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
125 | send_ringbuffer_size + |
126 | recv_ringbuffer_size, | |
c50f7fb2 | 127 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 128 | |
fd4dc88e | 129 | if (ret != 0) { |
b94ef345 | 130 | err = ret; |
13925502 | 131 | goto error0; |
b94ef345 | 132 | } |
f4266e34 | 133 | |
454f18a9 | 134 | /* Create and init the channel open message */ |
176fb9e3 | 135 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
136 | sizeof(struct vmbus_channel_open_channel), |
137 | GFP_KERNEL); | |
176fb9e3 | 138 | if (!open_info) { |
c3bf2e26 | 139 | err = -ENOMEM; |
13925502 | 140 | goto error0; |
c3bf2e26 | 141 | } |
3e7ee490 | 142 | |
176fb9e3 | 143 | init_completion(&open_info->waitevent); |
3e7ee490 | 144 | |
176fb9e3 | 145 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
146 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
147 | open_msg->openid = newchannel->offermsg.child_relid; | |
148 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
149 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
150 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 151 | PAGE_SHIFT; |
abbf3b2a | 152 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 153 | |
39d70a4a | 154 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 155 | err = -EINVAL; |
13925502 | 156 | goto error0; |
c827f944 BP |
157 | } |
158 | ||
39d70a4a | 159 | if (userdatalen) |
0987ff69 | 160 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 161 | |
15b2f647 | 162 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 163 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 164 | &vmbus_connection.chn_msg_list); |
15b2f647 | 165 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 166 | |
0987ff69 | 167 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 168 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 | 169 | |
45d727ce S |
170 | if (ret != 0) { |
171 | err = ret; | |
13925502 | 172 | goto error1; |
45d727ce | 173 | } |
3e7ee490 | 174 | |
176fb9e3 | 175 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 176 | if (t == 0) { |
0c3b7b2f | 177 | err = -ETIMEDOUT; |
13925502 | 178 | goto error1; |
0c3b7b2f S |
179 | } |
180 | ||
3e7ee490 | 181 | |
176fb9e3 S |
182 | if (open_info->response.open_result.status) |
183 | err = open_info->response.open_result.status; | |
3e7ee490 | 184 | |
15b2f647 | 185 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 186 | list_del(&open_info->msglistentry); |
15b2f647 | 187 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 188 | |
e68d2971 S |
189 | if (err == 0) |
190 | newchannel->state = CHANNEL_OPENED_STATE; | |
191 | ||
176fb9e3 | 192 | kfree(open_info); |
98e08702 | 193 | return err; |
c3bf2e26 | 194 | |
13925502 S |
195 | error1: |
196 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
197 | list_del(&open_info->msglistentry); | |
198 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
199 | ||
200 | error0: | |
df3493e0 S |
201 | free_pages((unsigned long)out, |
202 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 203 | kfree(open_info); |
ac0d12b7 | 204 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 205 | return err; |
3e7ee490 | 206 | } |
36ceadfc | 207 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 208 | |
3e189519 | 209 | /* |
fff41b2e | 210 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 211 | */ |
fff41b2e | 212 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
213 | struct vmbus_channel_msginfo **msginfo, |
214 | u32 *messagecount) | |
3e7ee490 HJ |
215 | { |
216 | int i; | |
39d70a4a | 217 | int pagecount; |
39d70a4a HZ |
218 | struct vmbus_channel_gpadl_header *gpadl_header; |
219 | struct vmbus_channel_gpadl_body *gpadl_body; | |
220 | struct vmbus_channel_msginfo *msgheader; | |
221 | struct vmbus_channel_msginfo *msgbody = NULL; | |
222 | u32 msgsize; | |
3e7ee490 | 223 | |
39d70a4a | 224 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 225 | |
39d70a4a | 226 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 227 | |
454f18a9 | 228 | /* do we need a gpadl body msg */ |
39d70a4a | 229 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
230 | sizeof(struct vmbus_channel_gpadl_header) - |
231 | sizeof(struct gpa_range); | |
39d70a4a | 232 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 233 | |
39d70a4a | 234 | if (pagecount > pfncount) { |
f4266e34 | 235 | /* we need a gpadl body */ |
454f18a9 | 236 | /* fill in the header */ |
39d70a4a | 237 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 238 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
239 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
240 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
241 | if (!msgheader) | |
d1c250bb | 242 | goto nomem; |
3e7ee490 | 243 | |
c50f7fb2 HZ |
244 | INIT_LIST_HEAD(&msgheader->submsglist); |
245 | msgheader->msgsize = msgsize; | |
3e7ee490 | 246 | |
39d70a4a | 247 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
248 | msgheader->msg; |
249 | gpadl_header->rangecount = 1; | |
250 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 251 | pagecount * sizeof(u64); |
415f2287 HZ |
252 | gpadl_header->range[0].byte_offset = 0; |
253 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 254 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
255 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
256 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
257 | *msginfo = msgheader; |
258 | *messagecount = 1; | |
3e7ee490 | 259 | |
39d70a4a HZ |
260 | pfnsum = pfncount; |
261 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 262 | |
454f18a9 | 263 | /* how many pfns can we fit */ |
39d70a4a | 264 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 265 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 266 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 267 | |
454f18a9 | 268 | /* fill in the body */ |
39d70a4a HZ |
269 | while (pfnleft) { |
270 | if (pfnleft > pfncount) | |
271 | pfncurr = pfncount; | |
3e7ee490 | 272 | else |
39d70a4a | 273 | pfncurr = pfnleft; |
3e7ee490 | 274 | |
39d70a4a | 275 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 276 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
277 | pfncurr * sizeof(u64); |
278 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
279 | |
280 | if (!msgbody) { | |
281 | struct vmbus_channel_msginfo *pos = NULL; | |
282 | struct vmbus_channel_msginfo *tmp = NULL; | |
283 | /* | |
284 | * Free up all the allocated messages. | |
285 | */ | |
286 | list_for_each_entry_safe(pos, tmp, | |
287 | &msgheader->submsglist, | |
288 | msglistentry) { | |
289 | ||
290 | list_del(&pos->msglistentry); | |
291 | kfree(pos); | |
292 | } | |
293 | ||
d1c250bb | 294 | goto nomem; |
f38cf9cc S |
295 | } |
296 | ||
c50f7fb2 | 297 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
298 | (*messagecount)++; |
299 | gpadl_body = | |
c50f7fb2 | 300 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
301 | |
302 | /* | |
f4266e34 GKH |
303 | * Gpadl is u32 and we are using a pointer which could |
304 | * be 64-bit | |
f27df643 S |
305 | * This is governed by the guest/host protocol and |
306 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 307 | */ |
39d70a4a | 308 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
309 | gpadl_body->pfn[i] = slow_virt_to_phys( |
310 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
311 | PAGE_SHIFT; | |
3e7ee490 | 312 | |
454f18a9 | 313 | /* add to msg header */ |
c50f7fb2 HZ |
314 | list_add_tail(&msgbody->msglistentry, |
315 | &msgheader->submsglist); | |
39d70a4a HZ |
316 | pfnsum += pfncurr; |
317 | pfnleft -= pfncurr; | |
3e7ee490 | 318 | } |
f4266e34 | 319 | } else { |
454f18a9 | 320 | /* everything fits in a header */ |
39d70a4a | 321 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 322 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
323 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
324 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
325 | if (msgheader == NULL) | |
e3eb7cdd | 326 | goto nomem; |
c50f7fb2 | 327 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
328 | |
329 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
330 | msgheader->msg; |
331 | gpadl_header->rangecount = 1; | |
332 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 333 | pagecount * sizeof(u64); |
415f2287 HZ |
334 | gpadl_header->range[0].byte_offset = 0; |
335 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 336 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
337 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
338 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
339 | |
340 | *msginfo = msgheader; | |
341 | *messagecount = 1; | |
3e7ee490 HJ |
342 | } |
343 | ||
344 | return 0; | |
d1c250bb | 345 | nomem: |
39d70a4a HZ |
346 | kfree(msgheader); |
347 | kfree(msgbody); | |
d1c250bb | 348 | return -ENOMEM; |
3e7ee490 HJ |
349 | } |
350 | ||
3e189519 | 351 | /* |
fff41b2e | 352 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 353 | * |
39d70a4a | 354 | * @channel: a channel |
b679ef73 | 355 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
356 | * @size: page-size multiple |
357 | * @gpadl_handle: some funky thing | |
f4266e34 | 358 | */ |
fff41b2e | 359 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 360 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 361 | { |
39d70a4a HZ |
362 | struct vmbus_channel_gpadl_header *gpadlmsg; |
363 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
364 | struct vmbus_channel_msginfo *msginfo = NULL; |
365 | struct vmbus_channel_msginfo *submsginfo; | |
366 | u32 msgcount; | |
53af545b | 367 | struct list_head *curr; |
39d70a4a | 368 | u32 next_gpadl_handle; |
dd0813b6 | 369 | unsigned long flags; |
c3bf2e26 | 370 | int ret = 0; |
3e7ee490 | 371 | |
9f52a163 S |
372 | next_gpadl_handle = |
373 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 374 | |
fff41b2e | 375 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
376 | if (ret) |
377 | return ret; | |
3e7ee490 | 378 | |
9568a193 | 379 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 380 | |
c50f7fb2 HZ |
381 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
382 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
383 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
384 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 385 | |
3e7ee490 | 386 | |
15b2f647 | 387 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 388 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 389 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 390 | |
15b2f647 | 391 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 392 | |
c6977677 | 393 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 394 | sizeof(*msginfo)); |
98e08702 | 395 | if (ret != 0) |
00d760b0 | 396 | goto cleanup; |
3e7ee490 | 397 | |
39d70a4a | 398 | if (msgcount > 1) { |
c50f7fb2 | 399 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 400 | |
39d70a4a HZ |
401 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
402 | gpadl_body = | |
c50f7fb2 | 403 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 404 | |
c50f7fb2 HZ |
405 | gpadl_body->header.msgtype = |
406 | CHANNELMSG_GPADL_BODY; | |
407 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 408 | |
c6977677 | 409 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 410 | submsginfo->msgsize - |
39d70a4a | 411 | sizeof(*submsginfo)); |
fd4dc88e | 412 | if (ret != 0) |
00d760b0 | 413 | goto cleanup; |
99259159 | 414 | |
3e7ee490 HJ |
415 | } |
416 | } | |
72c6b71c | 417 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 418 | |
454f18a9 | 419 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 420 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 421 | |
00d760b0 | 422 | cleanup: |
15b2f647 | 423 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 424 | list_del(&msginfo->msglistentry); |
15b2f647 | 425 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 426 | |
39d70a4a | 427 | kfree(msginfo); |
3e7ee490 HJ |
428 | return ret; |
429 | } | |
98873724 | 430 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 431 | |
3e189519 | 432 | /* |
fff41b2e | 433 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 434 | */ |
fff41b2e | 435 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 436 | { |
82250213 | 437 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 438 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 439 | unsigned long flags; |
66be6530 | 440 | int ret; |
3e7ee490 | 441 | |
f4266e34 GKH |
442 | info = kmalloc(sizeof(*info) + |
443 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
444 | if (!info) |
445 | return -ENOMEM; | |
3e7ee490 | 446 | |
9568a193 | 447 | init_completion(&info->waitevent); |
3e7ee490 | 448 | |
c50f7fb2 | 449 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 450 | |
c50f7fb2 HZ |
451 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
452 | msg->child_relid = channel->offermsg.child_relid; | |
453 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 454 | |
15b2f647 | 455 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 456 | list_add_tail(&info->msglistentry, |
da9fcb72 | 457 | &vmbus_connection.chn_msg_list); |
15b2f647 | 458 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 459 | ret = vmbus_post_msg(msg, |
f4266e34 | 460 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 461 | |
66be6530 S |
462 | if (ret) |
463 | goto post_msg_err; | |
464 | ||
465 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 466 | |
66be6530 | 467 | post_msg_err: |
15b2f647 | 468 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 469 | list_del(&info->msglistentry); |
15b2f647 | 470 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 471 | |
8c69f52a | 472 | kfree(info); |
3e7ee490 HJ |
473 | return ret; |
474 | } | |
18726d7a | 475 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 476 | |
d3ba720d S |
477 | static void reset_channel_cb(void *arg) |
478 | { | |
479 | struct vmbus_channel *channel = arg; | |
480 | ||
481 | channel->onchannel_callback = NULL; | |
482 | } | |
483 | ||
98d731bb | 484 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 485 | { |
82250213 | 486 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 487 | int ret; |
3e7ee490 | 488 | |
e68d2971 S |
489 | channel->state = CHANNEL_OPEN_STATE; |
490 | channel->sc_creation_callback = NULL; | |
454f18a9 | 491 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
492 | if (channel->target_cpu != get_cpu()) { |
493 | put_cpu(); | |
d3ba720d S |
494 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
495 | channel, true); | |
2115b561 | 496 | } else { |
d3ba720d | 497 | reset_channel_cb(channel); |
2115b561 S |
498 | put_cpu(); |
499 | } | |
3e7ee490 | 500 | |
454f18a9 | 501 | /* Send a closing message */ |
3e7ee490 | 502 | |
e9a27a9f | 503 | msg = &channel->close_msg.msg; |
3e7ee490 | 504 | |
c50f7fb2 HZ |
505 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
506 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 507 | |
c6977677 | 508 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 509 | |
98d731bb S |
510 | if (ret) { |
511 | pr_err("Close failed: close post msg return is %d\n", ret); | |
512 | /* | |
513 | * If we failed to post the close msg, | |
514 | * it is perhaps better to leak memory. | |
515 | */ | |
516 | return ret; | |
517 | } | |
518 | ||
454f18a9 | 519 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
520 | if (channel->ringbuffer_gpadlhandle) { |
521 | ret = vmbus_teardown_gpadl(channel, | |
522 | channel->ringbuffer_gpadlhandle); | |
523 | if (ret) { | |
524 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
525 | /* | |
526 | * If we failed to teardown gpadl, | |
527 | * it is perhaps better to leak memory. | |
528 | */ | |
529 | return ret; | |
530 | } | |
531 | } | |
3e7ee490 | 532 | |
454f18a9 | 533 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
534 | hv_ringbuffer_cleanup(&channel->outbound); |
535 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 536 | |
df3493e0 S |
537 | free_pages((unsigned long)channel->ringbuffer_pages, |
538 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 539 | |
98d731bb | 540 | return ret; |
3e7ee490 | 541 | } |
e68d2971 S |
542 | |
543 | /* | |
544 | * vmbus_close - Close the specified channel | |
545 | */ | |
546 | void vmbus_close(struct vmbus_channel *channel) | |
547 | { | |
548 | struct list_head *cur, *tmp; | |
549 | struct vmbus_channel *cur_channel; | |
550 | ||
551 | if (channel->primary_channel != NULL) { | |
552 | /* | |
553 | * We will only close sub-channels when | |
554 | * the primary is closed. | |
555 | */ | |
556 | return; | |
557 | } | |
558 | /* | |
559 | * Close all the sub-channels first and then close the | |
560 | * primary channel. | |
561 | */ | |
562 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
563 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
564 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
565 | continue; | |
566 | vmbus_close_internal(cur_channel); | |
567 | } | |
568 | /* | |
569 | * Now close the primary. | |
570 | */ | |
571 | vmbus_close_internal(channel); | |
572 | } | |
70bfa307 | 573 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 574 | |
c88c4e4c | 575 | /** |
fff41b2e | 576 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
577 | * @channel: Pointer to vmbus_channel structure. |
578 | * @buffer: Pointer to the buffer you want to receive the data into. | |
579 | * @bufferlen: Maximum size of what the the buffer will hold | |
580 | * @requestid: Identifier of the request | |
581 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
582 | * packet etc. |
583 | * | |
39d70a4a | 584 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
585 | * This will send the data unparsed to hyper-v. |
586 | * | |
587 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 588 | */ |
011a7c3c | 589 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
590 | u32 bufferlen, u64 requestid, |
591 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 592 | { |
8dc0a06a | 593 | struct vmpacket_descriptor desc; |
39d70a4a | 594 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 595 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 596 | struct kvec bufferlist[3]; |
39d70a4a | 597 | u64 aligned_data = 0; |
f4266e34 | 598 | int ret; |
98fa8cf4 | 599 | bool signal = false; |
3e7ee490 | 600 | |
3e7ee490 | 601 | |
454f18a9 | 602 | /* Setup the descriptor */ |
415f2287 HZ |
603 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
604 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 605 | /* in 8-bytes granularity */ |
415f2287 HZ |
606 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
607 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
608 | desc.trans_id = requestid; | |
3e7ee490 | 609 | |
011a7c3c S |
610 | bufferlist[0].iov_base = &desc; |
611 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
612 | bufferlist[1].iov_base = buffer; | |
613 | bufferlist[1].iov_len = bufferlen; | |
614 | bufferlist[2].iov_base = &aligned_data; | |
615 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 616 | |
98fa8cf4 | 617 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 618 | |
98fa8cf4 | 619 | if (ret == 0 && signal) |
fff41b2e | 620 | vmbus_setevent(channel); |
3e7ee490 | 621 | |
3e7ee490 HJ |
622 | return ret; |
623 | } | |
fff41b2e | 624 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 625 | |
3e189519 | 626 | /* |
fff41b2e | 627 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 628 | * packets using a GPADL Direct packet type. |
f4266e34 | 629 | */ |
fff41b2e | 630 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
631 | struct hv_page_buffer pagebuffers[], |
632 | u32 pagecount, void *buffer, u32 bufferlen, | |
633 | u64 requestid) | |
3e7ee490 | 634 | { |
f4266e34 GKH |
635 | int ret; |
636 | int i; | |
430a8e9a | 637 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
638 | u32 descsize; |
639 | u32 packetlen; | |
640 | u32 packetlen_aligned; | |
011a7c3c | 641 | struct kvec bufferlist[3]; |
39d70a4a | 642 | u64 aligned_data = 0; |
98fa8cf4 | 643 | bool signal = false; |
3e7ee490 | 644 | |
39d70a4a | 645 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 646 | return -EINVAL; |
3e7ee490 | 647 | |
3e7ee490 | 648 | |
f4266e34 | 649 | /* |
430a8e9a | 650 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
651 | * largest size we support |
652 | */ | |
39d70a4a HZ |
653 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
654 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 655 | sizeof(struct hv_page_buffer)); |
39d70a4a | 656 | packetlen = descsize + bufferlen; |
73509681 | 657 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 658 | |
454f18a9 | 659 | /* Setup the descriptor */ |
415f2287 | 660 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 661 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
662 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
663 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
664 | desc.transactionid = requestid; | |
665 | desc.rangecount = pagecount; | |
666 | ||
667 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
668 | desc.range[i].len = pagebuffers[i].len; |
669 | desc.range[i].offset = pagebuffers[i].offset; | |
670 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
671 | } |
672 | ||
011a7c3c S |
673 | bufferlist[0].iov_base = &desc; |
674 | bufferlist[0].iov_len = descsize; | |
675 | bufferlist[1].iov_base = buffer; | |
676 | bufferlist[1].iov_len = bufferlen; | |
677 | bufferlist[2].iov_base = &aligned_data; | |
678 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 679 | |
98fa8cf4 | 680 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 681 | |
98fa8cf4 | 682 | if (ret == 0 && signal) |
fff41b2e | 683 | vmbus_setevent(channel); |
3e7ee490 | 684 | |
3e7ee490 HJ |
685 | return ret; |
686 | } | |
713efeb4 | 687 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 688 | |
d61031ee S |
689 | /* |
690 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
691 | * using a GPADL Direct packet type. | |
692 | * The buffer includes the vmbus descriptor. | |
693 | */ | |
694 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
695 | struct vmbus_packet_mpb_array *desc, | |
696 | u32 desc_size, | |
697 | void *buffer, u32 bufferlen, u64 requestid) | |
698 | { | |
699 | int ret; | |
700 | u32 packetlen; | |
701 | u32 packetlen_aligned; | |
702 | struct kvec bufferlist[3]; | |
703 | u64 aligned_data = 0; | |
704 | bool signal = false; | |
705 | ||
706 | packetlen = desc_size + bufferlen; | |
707 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
708 | ||
709 | /* Setup the descriptor */ | |
710 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
711 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
712 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
713 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
714 | desc->transactionid = requestid; | |
715 | desc->rangecount = 1; | |
716 | ||
717 | bufferlist[0].iov_base = desc; | |
718 | bufferlist[0].iov_len = desc_size; | |
719 | bufferlist[1].iov_base = buffer; | |
720 | bufferlist[1].iov_len = bufferlen; | |
721 | bufferlist[2].iov_base = &aligned_data; | |
722 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
723 | ||
724 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); | |
725 | ||
726 | if (ret == 0 && signal) | |
727 | vmbus_setevent(channel); | |
728 | ||
729 | return ret; | |
730 | } | |
731 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
732 | ||
3e189519 | 733 | /* |
fff41b2e | 734 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 735 | * using a GPADL Direct packet type. |
f4266e34 | 736 | */ |
fff41b2e | 737 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
738 | struct hv_multipage_buffer *multi_pagebuffer, |
739 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 740 | { |
f4266e34 | 741 | int ret; |
430a8e9a | 742 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
743 | u32 descsize; |
744 | u32 packetlen; | |
745 | u32 packetlen_aligned; | |
011a7c3c | 746 | struct kvec bufferlist[3]; |
39d70a4a | 747 | u64 aligned_data = 0; |
98fa8cf4 | 748 | bool signal = false; |
ca623ad3 HZ |
749 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
750 | multi_pagebuffer->len); | |
3e7ee490 | 751 | |
24b8a406 | 752 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 753 | return -EINVAL; |
3e7ee490 | 754 | |
f4266e34 | 755 | /* |
430a8e9a | 756 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
757 | * the largest size we support |
758 | */ | |
39d70a4a HZ |
759 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
760 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 761 | sizeof(u64)); |
39d70a4a | 762 | packetlen = descsize + bufferlen; |
73509681 | 763 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 764 | |
3e7ee490 | 765 | |
454f18a9 | 766 | /* Setup the descriptor */ |
415f2287 | 767 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 768 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
769 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
770 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
771 | desc.transactionid = requestid; | |
430a8e9a | 772 | desc.rangecount = 1; |
3e7ee490 | 773 | |
ca623ad3 HZ |
774 | desc.range.len = multi_pagebuffer->len; |
775 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 776 | |
ca623ad3 | 777 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 778 | pfncount * sizeof(u64)); |
3e7ee490 | 779 | |
011a7c3c S |
780 | bufferlist[0].iov_base = &desc; |
781 | bufferlist[0].iov_len = descsize; | |
782 | bufferlist[1].iov_base = buffer; | |
783 | bufferlist[1].iov_len = bufferlen; | |
784 | bufferlist[2].iov_base = &aligned_data; | |
785 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 786 | |
98fa8cf4 | 787 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 788 | |
98fa8cf4 | 789 | if (ret == 0 && signal) |
fff41b2e | 790 | vmbus_setevent(channel); |
3e7ee490 | 791 | |
3e7ee490 HJ |
792 | return ret; |
793 | } | |
4cb106fa | 794 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
795 | |
796 | /** | |
fff41b2e | 797 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
798 | * @channel: Pointer to vmbus_channel structure. |
799 | * @buffer: Pointer to the buffer you want to receive the data into. | |
800 | * @bufferlen: Maximum size of what the the buffer will hold | |
801 | * @buffer_actual_len: The actual size of the data after it was received | |
802 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
803 | * |
804 | * Receives directly from the hyper-v vmbus and puts the data it received | |
805 | * into Buffer. This will receive the data unparsed from hyper-v. | |
806 | * | |
807 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 808 | */ |
fff41b2e | 809 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 810 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 811 | { |
8dc0a06a | 812 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
813 | u32 packetlen; |
814 | u32 userlen; | |
3e7ee490 | 815 | int ret; |
c2b8e520 | 816 | bool signal = false; |
3e7ee490 | 817 | |
39d70a4a HZ |
818 | *buffer_actual_len = 0; |
819 | *requestid = 0; | |
3e7ee490 | 820 | |
3e7ee490 | 821 | |
a89186c2 | 822 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 823 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 824 | if (ret != 0) |
3e7ee490 | 825 | return 0; |
3e7ee490 | 826 | |
415f2287 HZ |
827 | packetlen = desc.len8 << 3; |
828 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 829 | |
39d70a4a | 830 | *buffer_actual_len = userlen; |
3e7ee490 | 831 | |
39d70a4a | 832 | if (userlen > bufferlen) { |
3e7ee490 | 833 | |
0a46618d | 834 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 835 | bufferlen, userlen); |
926ae526 | 836 | return -ETOOSMALL; |
3e7ee490 HJ |
837 | } |
838 | ||
415f2287 | 839 | *requestid = desc.trans_id; |
3e7ee490 | 840 | |
454f18a9 | 841 | /* Copy over the packet to the user buffer */ |
38397c8a | 842 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 843 | (desc.offset8 << 3), &signal); |
3e7ee490 | 844 | |
c2b8e520 S |
845 | if (signal) |
846 | vmbus_setevent(channel); | |
3e7ee490 | 847 | |
3e7ee490 HJ |
848 | return 0; |
849 | } | |
fff41b2e | 850 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 851 | |
3e189519 | 852 | /* |
fff41b2e | 853 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 854 | */ |
fff41b2e | 855 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
856 | u32 bufferlen, u32 *buffer_actual_len, |
857 | u64 *requestid) | |
3e7ee490 | 858 | { |
8dc0a06a | 859 | struct vmpacket_descriptor desc; |
39d70a4a | 860 | u32 packetlen; |
3e7ee490 | 861 | int ret; |
c2b8e520 | 862 | bool signal = false; |
3e7ee490 | 863 | |
39d70a4a HZ |
864 | *buffer_actual_len = 0; |
865 | *requestid = 0; | |
3e7ee490 | 866 | |
3e7ee490 | 867 | |
a89186c2 | 868 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 869 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 870 | if (ret != 0) |
3e7ee490 | 871 | return 0; |
3e7ee490 | 872 | |
3e7ee490 | 873 | |
415f2287 | 874 | packetlen = desc.len8 << 3; |
3e7ee490 | 875 | |
39d70a4a | 876 | *buffer_actual_len = packetlen; |
3e7ee490 | 877 | |
7a446d63 | 878 | if (packetlen > bufferlen) |
3d5cad97 | 879 | return -ENOBUFS; |
3e7ee490 | 880 | |
415f2287 | 881 | *requestid = desc.trans_id; |
3e7ee490 | 882 | |
454f18a9 | 883 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
884 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
885 | &signal); | |
886 | ||
887 | if (signal) | |
888 | vmbus_setevent(channel); | |
3e7ee490 | 889 | |
33b06938 | 890 | return ret; |
3e7ee490 | 891 | } |
adaee6bd | 892 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |