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; |
40384e4b | 140 | goto error_gpadl; |
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; |
40384e4b | 156 | goto error_gpadl; |
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 | ||
40384e4b S |
200 | error_gpadl: |
201 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); | |
202 | ||
13925502 | 203 | error0: |
df3493e0 S |
204 | free_pages((unsigned long)out, |
205 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 206 | kfree(open_info); |
ac0d12b7 | 207 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 208 | return err; |
3e7ee490 | 209 | } |
36ceadfc | 210 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 211 | |
3e189519 | 212 | /* |
fff41b2e | 213 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 214 | */ |
fff41b2e | 215 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
216 | struct vmbus_channel_msginfo **msginfo, |
217 | u32 *messagecount) | |
3e7ee490 HJ |
218 | { |
219 | int i; | |
39d70a4a | 220 | int pagecount; |
39d70a4a HZ |
221 | struct vmbus_channel_gpadl_header *gpadl_header; |
222 | struct vmbus_channel_gpadl_body *gpadl_body; | |
223 | struct vmbus_channel_msginfo *msgheader; | |
224 | struct vmbus_channel_msginfo *msgbody = NULL; | |
225 | u32 msgsize; | |
3e7ee490 | 226 | |
39d70a4a | 227 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 228 | |
39d70a4a | 229 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 230 | |
454f18a9 | 231 | /* do we need a gpadl body msg */ |
39d70a4a | 232 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
233 | sizeof(struct vmbus_channel_gpadl_header) - |
234 | sizeof(struct gpa_range); | |
39d70a4a | 235 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 236 | |
39d70a4a | 237 | if (pagecount > pfncount) { |
f4266e34 | 238 | /* we need a gpadl body */ |
454f18a9 | 239 | /* fill in the header */ |
39d70a4a | 240 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 241 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
242 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
243 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
244 | if (!msgheader) | |
d1c250bb | 245 | goto nomem; |
3e7ee490 | 246 | |
c50f7fb2 HZ |
247 | INIT_LIST_HEAD(&msgheader->submsglist); |
248 | msgheader->msgsize = msgsize; | |
3e7ee490 | 249 | |
39d70a4a | 250 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
251 | msgheader->msg; |
252 | gpadl_header->rangecount = 1; | |
253 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 254 | pagecount * sizeof(u64); |
415f2287 HZ |
255 | gpadl_header->range[0].byte_offset = 0; |
256 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 257 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
258 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
259 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
260 | *msginfo = msgheader; |
261 | *messagecount = 1; | |
3e7ee490 | 262 | |
39d70a4a HZ |
263 | pfnsum = pfncount; |
264 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 265 | |
454f18a9 | 266 | /* how many pfns can we fit */ |
39d70a4a | 267 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 268 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 269 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 270 | |
454f18a9 | 271 | /* fill in the body */ |
39d70a4a HZ |
272 | while (pfnleft) { |
273 | if (pfnleft > pfncount) | |
274 | pfncurr = pfncount; | |
3e7ee490 | 275 | else |
39d70a4a | 276 | pfncurr = pfnleft; |
3e7ee490 | 277 | |
39d70a4a | 278 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 279 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
280 | pfncurr * sizeof(u64); |
281 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
282 | |
283 | if (!msgbody) { | |
284 | struct vmbus_channel_msginfo *pos = NULL; | |
285 | struct vmbus_channel_msginfo *tmp = NULL; | |
286 | /* | |
287 | * Free up all the allocated messages. | |
288 | */ | |
289 | list_for_each_entry_safe(pos, tmp, | |
290 | &msgheader->submsglist, | |
291 | msglistentry) { | |
292 | ||
293 | list_del(&pos->msglistentry); | |
294 | kfree(pos); | |
295 | } | |
296 | ||
d1c250bb | 297 | goto nomem; |
f38cf9cc S |
298 | } |
299 | ||
c50f7fb2 | 300 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
301 | (*messagecount)++; |
302 | gpadl_body = | |
c50f7fb2 | 303 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
304 | |
305 | /* | |
f4266e34 GKH |
306 | * Gpadl is u32 and we are using a pointer which could |
307 | * be 64-bit | |
f27df643 S |
308 | * This is governed by the guest/host protocol and |
309 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 310 | */ |
39d70a4a | 311 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
312 | gpadl_body->pfn[i] = slow_virt_to_phys( |
313 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
314 | PAGE_SHIFT; | |
3e7ee490 | 315 | |
454f18a9 | 316 | /* add to msg header */ |
c50f7fb2 HZ |
317 | list_add_tail(&msgbody->msglistentry, |
318 | &msgheader->submsglist); | |
39d70a4a HZ |
319 | pfnsum += pfncurr; |
320 | pfnleft -= pfncurr; | |
3e7ee490 | 321 | } |
f4266e34 | 322 | } else { |
454f18a9 | 323 | /* everything fits in a header */ |
39d70a4a | 324 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 325 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
326 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
327 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
328 | if (msgheader == NULL) | |
e3eb7cdd | 329 | goto nomem; |
c50f7fb2 | 330 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
331 | |
332 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
333 | msgheader->msg; |
334 | gpadl_header->rangecount = 1; | |
335 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 336 | pagecount * sizeof(u64); |
415f2287 HZ |
337 | gpadl_header->range[0].byte_offset = 0; |
338 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 339 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
340 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
341 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
342 | |
343 | *msginfo = msgheader; | |
344 | *messagecount = 1; | |
3e7ee490 HJ |
345 | } |
346 | ||
347 | return 0; | |
d1c250bb | 348 | nomem: |
39d70a4a HZ |
349 | kfree(msgheader); |
350 | kfree(msgbody); | |
d1c250bb | 351 | return -ENOMEM; |
3e7ee490 HJ |
352 | } |
353 | ||
3e189519 | 354 | /* |
fff41b2e | 355 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 356 | * |
39d70a4a | 357 | * @channel: a channel |
b679ef73 | 358 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
359 | * @size: page-size multiple |
360 | * @gpadl_handle: some funky thing | |
f4266e34 | 361 | */ |
fff41b2e | 362 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 363 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 364 | { |
39d70a4a HZ |
365 | struct vmbus_channel_gpadl_header *gpadlmsg; |
366 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
367 | struct vmbus_channel_msginfo *msginfo = NULL; |
368 | struct vmbus_channel_msginfo *submsginfo; | |
369 | u32 msgcount; | |
53af545b | 370 | struct list_head *curr; |
39d70a4a | 371 | u32 next_gpadl_handle; |
dd0813b6 | 372 | unsigned long flags; |
c3bf2e26 | 373 | int ret = 0; |
3e7ee490 | 374 | |
9f52a163 S |
375 | next_gpadl_handle = |
376 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 377 | |
fff41b2e | 378 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
379 | if (ret) |
380 | return ret; | |
3e7ee490 | 381 | |
9568a193 | 382 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 383 | |
c50f7fb2 HZ |
384 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
385 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
386 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
387 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 388 | |
3e7ee490 | 389 | |
15b2f647 | 390 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 391 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 392 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 393 | |
15b2f647 | 394 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 395 | |
c6977677 | 396 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 397 | sizeof(*msginfo)); |
98e08702 | 398 | if (ret != 0) |
00d760b0 | 399 | goto cleanup; |
3e7ee490 | 400 | |
39d70a4a | 401 | if (msgcount > 1) { |
c50f7fb2 | 402 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 403 | |
39d70a4a HZ |
404 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
405 | gpadl_body = | |
c50f7fb2 | 406 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 407 | |
c50f7fb2 HZ |
408 | gpadl_body->header.msgtype = |
409 | CHANNELMSG_GPADL_BODY; | |
410 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 411 | |
c6977677 | 412 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 413 | submsginfo->msgsize - |
39d70a4a | 414 | sizeof(*submsginfo)); |
fd4dc88e | 415 | if (ret != 0) |
00d760b0 | 416 | goto cleanup; |
99259159 | 417 | |
3e7ee490 HJ |
418 | } |
419 | } | |
72c6b71c | 420 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 421 | |
454f18a9 | 422 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 423 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 424 | |
00d760b0 | 425 | cleanup: |
15b2f647 | 426 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 427 | list_del(&msginfo->msglistentry); |
15b2f647 | 428 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 429 | |
39d70a4a | 430 | kfree(msginfo); |
3e7ee490 HJ |
431 | return ret; |
432 | } | |
98873724 | 433 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 434 | |
3e189519 | 435 | /* |
fff41b2e | 436 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 437 | */ |
fff41b2e | 438 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 439 | { |
82250213 | 440 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 441 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 442 | unsigned long flags; |
66be6530 | 443 | int ret; |
3e7ee490 | 444 | |
f4266e34 GKH |
445 | info = kmalloc(sizeof(*info) + |
446 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
447 | if (!info) |
448 | return -ENOMEM; | |
3e7ee490 | 449 | |
9568a193 | 450 | init_completion(&info->waitevent); |
3e7ee490 | 451 | |
c50f7fb2 | 452 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 453 | |
c50f7fb2 HZ |
454 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
455 | msg->child_relid = channel->offermsg.child_relid; | |
456 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 457 | |
15b2f647 | 458 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 459 | list_add_tail(&info->msglistentry, |
da9fcb72 | 460 | &vmbus_connection.chn_msg_list); |
15b2f647 | 461 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 462 | ret = vmbus_post_msg(msg, |
f4266e34 | 463 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 464 | |
66be6530 S |
465 | if (ret) |
466 | goto post_msg_err; | |
467 | ||
468 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 469 | |
66be6530 | 470 | post_msg_err: |
15b2f647 | 471 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 472 | list_del(&info->msglistentry); |
15b2f647 | 473 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 474 | |
8c69f52a | 475 | kfree(info); |
3e7ee490 HJ |
476 | return ret; |
477 | } | |
18726d7a | 478 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 479 | |
d3ba720d S |
480 | static void reset_channel_cb(void *arg) |
481 | { | |
482 | struct vmbus_channel *channel = arg; | |
483 | ||
484 | channel->onchannel_callback = NULL; | |
485 | } | |
486 | ||
98d731bb | 487 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 488 | { |
82250213 | 489 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 490 | int ret; |
3e7ee490 | 491 | |
e68d2971 S |
492 | channel->state = CHANNEL_OPEN_STATE; |
493 | channel->sc_creation_callback = NULL; | |
454f18a9 | 494 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
495 | if (channel->target_cpu != get_cpu()) { |
496 | put_cpu(); | |
d3ba720d S |
497 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
498 | channel, true); | |
2115b561 | 499 | } else { |
d3ba720d | 500 | reset_channel_cb(channel); |
2115b561 S |
501 | put_cpu(); |
502 | } | |
3e7ee490 | 503 | |
ed6cfcc5 S |
504 | /* |
505 | * If the channel has been rescinded; process device removal. | |
506 | */ | |
507 | if (channel->rescind) { | |
508 | hv_process_channel_removal(channel, | |
509 | channel->offermsg.child_relid); | |
510 | return 0; | |
511 | } | |
512 | ||
454f18a9 | 513 | /* Send a closing message */ |
3e7ee490 | 514 | |
e9a27a9f | 515 | msg = &channel->close_msg.msg; |
3e7ee490 | 516 | |
c50f7fb2 HZ |
517 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
518 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 519 | |
c6977677 | 520 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 521 | |
98d731bb S |
522 | if (ret) { |
523 | pr_err("Close failed: close post msg return is %d\n", ret); | |
524 | /* | |
525 | * If we failed to post the close msg, | |
526 | * it is perhaps better to leak memory. | |
527 | */ | |
528 | return ret; | |
529 | } | |
530 | ||
454f18a9 | 531 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
532 | if (channel->ringbuffer_gpadlhandle) { |
533 | ret = vmbus_teardown_gpadl(channel, | |
534 | channel->ringbuffer_gpadlhandle); | |
535 | if (ret) { | |
536 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
537 | /* | |
538 | * If we failed to teardown gpadl, | |
539 | * it is perhaps better to leak memory. | |
540 | */ | |
541 | return ret; | |
542 | } | |
543 | } | |
3e7ee490 | 544 | |
454f18a9 | 545 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
546 | hv_ringbuffer_cleanup(&channel->outbound); |
547 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 548 | |
df3493e0 S |
549 | free_pages((unsigned long)channel->ringbuffer_pages, |
550 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 551 | |
98d731bb | 552 | return ret; |
3e7ee490 | 553 | } |
e68d2971 S |
554 | |
555 | /* | |
556 | * vmbus_close - Close the specified channel | |
557 | */ | |
558 | void vmbus_close(struct vmbus_channel *channel) | |
559 | { | |
560 | struct list_head *cur, *tmp; | |
561 | struct vmbus_channel *cur_channel; | |
562 | ||
563 | if (channel->primary_channel != NULL) { | |
564 | /* | |
565 | * We will only close sub-channels when | |
566 | * the primary is closed. | |
567 | */ | |
568 | return; | |
569 | } | |
570 | /* | |
571 | * Close all the sub-channels first and then close the | |
572 | * primary channel. | |
573 | */ | |
574 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
575 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
576 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
577 | continue; | |
578 | vmbus_close_internal(cur_channel); | |
579 | } | |
580 | /* | |
581 | * Now close the primary. | |
582 | */ | |
583 | vmbus_close_internal(channel); | |
584 | } | |
70bfa307 | 585 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 586 | |
c88c4e4c | 587 | /** |
fff41b2e | 588 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
589 | * @channel: Pointer to vmbus_channel structure. |
590 | * @buffer: Pointer to the buffer you want to receive the data into. | |
591 | * @bufferlen: Maximum size of what the the buffer will hold | |
592 | * @requestid: Identifier of the request | |
593 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
594 | * packet etc. |
595 | * | |
39d70a4a | 596 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
597 | * This will send the data unparsed to hyper-v. |
598 | * | |
599 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 600 | */ |
011a7c3c | 601 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
602 | u32 bufferlen, u64 requestid, |
603 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 604 | { |
8dc0a06a | 605 | struct vmpacket_descriptor desc; |
39d70a4a | 606 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 607 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 608 | struct kvec bufferlist[3]; |
39d70a4a | 609 | u64 aligned_data = 0; |
f4266e34 | 610 | int ret; |
98fa8cf4 | 611 | bool signal = false; |
3e7ee490 | 612 | |
3e7ee490 | 613 | |
454f18a9 | 614 | /* Setup the descriptor */ |
415f2287 HZ |
615 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
616 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 617 | /* in 8-bytes granularity */ |
415f2287 HZ |
618 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
619 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
620 | desc.trans_id = requestid; | |
3e7ee490 | 621 | |
011a7c3c S |
622 | bufferlist[0].iov_base = &desc; |
623 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
624 | bufferlist[1].iov_base = buffer; | |
625 | bufferlist[1].iov_len = bufferlen; | |
626 | bufferlist[2].iov_base = &aligned_data; | |
627 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 628 | |
98fa8cf4 | 629 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 630 | |
98fa8cf4 | 631 | if (ret == 0 && signal) |
fff41b2e | 632 | vmbus_setevent(channel); |
3e7ee490 | 633 | |
3e7ee490 HJ |
634 | return ret; |
635 | } | |
fff41b2e | 636 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 637 | |
3e189519 | 638 | /* |
fff41b2e | 639 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 640 | * packets using a GPADL Direct packet type. |
f4266e34 | 641 | */ |
fff41b2e | 642 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
643 | struct hv_page_buffer pagebuffers[], |
644 | u32 pagecount, void *buffer, u32 bufferlen, | |
645 | u64 requestid) | |
3e7ee490 | 646 | { |
f4266e34 GKH |
647 | int ret; |
648 | int i; | |
430a8e9a | 649 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
650 | u32 descsize; |
651 | u32 packetlen; | |
652 | u32 packetlen_aligned; | |
011a7c3c | 653 | struct kvec bufferlist[3]; |
39d70a4a | 654 | u64 aligned_data = 0; |
98fa8cf4 | 655 | bool signal = false; |
3e7ee490 | 656 | |
39d70a4a | 657 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 658 | return -EINVAL; |
3e7ee490 | 659 | |
3e7ee490 | 660 | |
f4266e34 | 661 | /* |
430a8e9a | 662 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
663 | * largest size we support |
664 | */ | |
39d70a4a HZ |
665 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
666 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 667 | sizeof(struct hv_page_buffer)); |
39d70a4a | 668 | packetlen = descsize + bufferlen; |
73509681 | 669 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 670 | |
454f18a9 | 671 | /* Setup the descriptor */ |
415f2287 | 672 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 673 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
674 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
675 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
676 | desc.transactionid = requestid; | |
677 | desc.rangecount = pagecount; | |
678 | ||
679 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
680 | desc.range[i].len = pagebuffers[i].len; |
681 | desc.range[i].offset = pagebuffers[i].offset; | |
682 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
683 | } |
684 | ||
011a7c3c S |
685 | bufferlist[0].iov_base = &desc; |
686 | bufferlist[0].iov_len = descsize; | |
687 | bufferlist[1].iov_base = buffer; | |
688 | bufferlist[1].iov_len = bufferlen; | |
689 | bufferlist[2].iov_base = &aligned_data; | |
690 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 691 | |
98fa8cf4 | 692 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 693 | |
98fa8cf4 | 694 | if (ret == 0 && signal) |
fff41b2e | 695 | vmbus_setevent(channel); |
3e7ee490 | 696 | |
3e7ee490 HJ |
697 | return ret; |
698 | } | |
713efeb4 | 699 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 700 | |
d61031ee S |
701 | /* |
702 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
703 | * using a GPADL Direct packet type. | |
704 | * The buffer includes the vmbus descriptor. | |
705 | */ | |
706 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
707 | struct vmbus_packet_mpb_array *desc, | |
708 | u32 desc_size, | |
709 | void *buffer, u32 bufferlen, u64 requestid) | |
710 | { | |
711 | int ret; | |
712 | u32 packetlen; | |
713 | u32 packetlen_aligned; | |
714 | struct kvec bufferlist[3]; | |
715 | u64 aligned_data = 0; | |
716 | bool signal = false; | |
717 | ||
718 | packetlen = desc_size + bufferlen; | |
719 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
720 | ||
721 | /* Setup the descriptor */ | |
722 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
723 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
724 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
725 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
726 | desc->transactionid = requestid; | |
727 | desc->rangecount = 1; | |
728 | ||
729 | bufferlist[0].iov_base = desc; | |
730 | bufferlist[0].iov_len = desc_size; | |
731 | bufferlist[1].iov_base = buffer; | |
732 | bufferlist[1].iov_len = bufferlen; | |
733 | bufferlist[2].iov_base = &aligned_data; | |
734 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
735 | ||
736 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); | |
737 | ||
738 | if (ret == 0 && signal) | |
739 | vmbus_setevent(channel); | |
740 | ||
741 | return ret; | |
742 | } | |
743 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
744 | ||
3e189519 | 745 | /* |
fff41b2e | 746 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 747 | * using a GPADL Direct packet type. |
f4266e34 | 748 | */ |
fff41b2e | 749 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
750 | struct hv_multipage_buffer *multi_pagebuffer, |
751 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 752 | { |
f4266e34 | 753 | int ret; |
430a8e9a | 754 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
755 | u32 descsize; |
756 | u32 packetlen; | |
757 | u32 packetlen_aligned; | |
011a7c3c | 758 | struct kvec bufferlist[3]; |
39d70a4a | 759 | u64 aligned_data = 0; |
98fa8cf4 | 760 | bool signal = false; |
ca623ad3 HZ |
761 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
762 | multi_pagebuffer->len); | |
3e7ee490 | 763 | |
24b8a406 | 764 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 765 | return -EINVAL; |
3e7ee490 | 766 | |
f4266e34 | 767 | /* |
430a8e9a | 768 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
769 | * the largest size we support |
770 | */ | |
39d70a4a HZ |
771 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
772 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 773 | sizeof(u64)); |
39d70a4a | 774 | packetlen = descsize + bufferlen; |
73509681 | 775 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 776 | |
3e7ee490 | 777 | |
454f18a9 | 778 | /* Setup the descriptor */ |
415f2287 | 779 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 780 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
781 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
782 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
783 | desc.transactionid = requestid; | |
430a8e9a | 784 | desc.rangecount = 1; |
3e7ee490 | 785 | |
ca623ad3 HZ |
786 | desc.range.len = multi_pagebuffer->len; |
787 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 788 | |
ca623ad3 | 789 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 790 | pfncount * sizeof(u64)); |
3e7ee490 | 791 | |
011a7c3c S |
792 | bufferlist[0].iov_base = &desc; |
793 | bufferlist[0].iov_len = descsize; | |
794 | bufferlist[1].iov_base = buffer; | |
795 | bufferlist[1].iov_len = bufferlen; | |
796 | bufferlist[2].iov_base = &aligned_data; | |
797 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 798 | |
98fa8cf4 | 799 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 800 | |
98fa8cf4 | 801 | if (ret == 0 && signal) |
fff41b2e | 802 | vmbus_setevent(channel); |
3e7ee490 | 803 | |
3e7ee490 HJ |
804 | return ret; |
805 | } | |
4cb106fa | 806 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
807 | |
808 | /** | |
fff41b2e | 809 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
810 | * @channel: Pointer to vmbus_channel structure. |
811 | * @buffer: Pointer to the buffer you want to receive the data into. | |
812 | * @bufferlen: Maximum size of what the the buffer will hold | |
813 | * @buffer_actual_len: The actual size of the data after it was received | |
814 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
815 | * |
816 | * Receives directly from the hyper-v vmbus and puts the data it received | |
817 | * into Buffer. This will receive the data unparsed from hyper-v. | |
818 | * | |
819 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 820 | */ |
fff41b2e | 821 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 822 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 823 | { |
8dc0a06a | 824 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
825 | u32 packetlen; |
826 | u32 userlen; | |
3e7ee490 | 827 | int ret; |
c2b8e520 | 828 | bool signal = false; |
3e7ee490 | 829 | |
39d70a4a HZ |
830 | *buffer_actual_len = 0; |
831 | *requestid = 0; | |
3e7ee490 | 832 | |
3e7ee490 | 833 | |
a89186c2 | 834 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 835 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 836 | if (ret != 0) |
3e7ee490 | 837 | return 0; |
3e7ee490 | 838 | |
415f2287 HZ |
839 | packetlen = desc.len8 << 3; |
840 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 841 | |
39d70a4a | 842 | *buffer_actual_len = userlen; |
3e7ee490 | 843 | |
39d70a4a | 844 | if (userlen > bufferlen) { |
3e7ee490 | 845 | |
0a46618d | 846 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 847 | bufferlen, userlen); |
926ae526 | 848 | return -ETOOSMALL; |
3e7ee490 HJ |
849 | } |
850 | ||
415f2287 | 851 | *requestid = desc.trans_id; |
3e7ee490 | 852 | |
454f18a9 | 853 | /* Copy over the packet to the user buffer */ |
38397c8a | 854 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 855 | (desc.offset8 << 3), &signal); |
3e7ee490 | 856 | |
c2b8e520 S |
857 | if (signal) |
858 | vmbus_setevent(channel); | |
3e7ee490 | 859 | |
3e7ee490 HJ |
860 | return 0; |
861 | } | |
fff41b2e | 862 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 863 | |
3e189519 | 864 | /* |
fff41b2e | 865 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 866 | */ |
fff41b2e | 867 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
868 | u32 bufferlen, u32 *buffer_actual_len, |
869 | u64 *requestid) | |
3e7ee490 | 870 | { |
8dc0a06a | 871 | struct vmpacket_descriptor desc; |
39d70a4a | 872 | u32 packetlen; |
3e7ee490 | 873 | int ret; |
c2b8e520 | 874 | bool signal = false; |
3e7ee490 | 875 | |
39d70a4a HZ |
876 | *buffer_actual_len = 0; |
877 | *requestid = 0; | |
3e7ee490 | 878 | |
3e7ee490 | 879 | |
a89186c2 | 880 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 881 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 882 | if (ret != 0) |
3e7ee490 | 883 | return 0; |
3e7ee490 | 884 | |
3e7ee490 | 885 | |
415f2287 | 886 | packetlen = desc.len8 << 3; |
3e7ee490 | 887 | |
39d70a4a | 888 | *buffer_actual_len = packetlen; |
3e7ee490 | 889 | |
7a446d63 | 890 | if (packetlen > bufferlen) |
3d5cad97 | 891 | return -ENOBUFS; |
3e7ee490 | 892 | |
415f2287 | 893 | *requestid = desc.trans_id; |
3e7ee490 | 894 | |
454f18a9 | 895 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
896 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
897 | &signal); | |
898 | ||
899 | if (signal) | |
900 | vmbus_setevent(channel); | |
3e7ee490 | 901 | |
33b06938 | 902 | return ret; |
3e7ee490 | 903 | } |
adaee6bd | 904 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |