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 | ||
15b2f647 | 181 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 182 | list_del(&open_info->msglistentry); |
15b2f647 | 183 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 184 | |
ffc151f3 VK |
185 | if (open_info->response.open_result.status) { |
186 | err = -EAGAIN; | |
187 | goto error_gpadl; | |
188 | } | |
e68d2971 | 189 | |
ffc151f3 | 190 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 191 | kfree(open_info); |
ffc151f3 | 192 | return 0; |
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 | ||
40384e4b S |
199 | error_gpadl: |
200 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); | |
201 | ||
13925502 | 202 | error0: |
df3493e0 S |
203 | free_pages((unsigned long)out, |
204 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 205 | kfree(open_info); |
ac0d12b7 | 206 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 207 | return err; |
3e7ee490 | 208 | } |
36ceadfc | 209 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 210 | |
3e189519 | 211 | /* |
fff41b2e | 212 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 213 | */ |
fff41b2e | 214 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
215 | struct vmbus_channel_msginfo **msginfo, |
216 | u32 *messagecount) | |
3e7ee490 HJ |
217 | { |
218 | int i; | |
39d70a4a | 219 | int pagecount; |
39d70a4a HZ |
220 | struct vmbus_channel_gpadl_header *gpadl_header; |
221 | struct vmbus_channel_gpadl_body *gpadl_body; | |
222 | struct vmbus_channel_msginfo *msgheader; | |
223 | struct vmbus_channel_msginfo *msgbody = NULL; | |
224 | u32 msgsize; | |
3e7ee490 | 225 | |
39d70a4a | 226 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 227 | |
39d70a4a | 228 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 229 | |
454f18a9 | 230 | /* do we need a gpadl body msg */ |
39d70a4a | 231 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
232 | sizeof(struct vmbus_channel_gpadl_header) - |
233 | sizeof(struct gpa_range); | |
39d70a4a | 234 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 235 | |
39d70a4a | 236 | if (pagecount > pfncount) { |
f4266e34 | 237 | /* we need a gpadl body */ |
454f18a9 | 238 | /* fill in the header */ |
39d70a4a | 239 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 240 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
241 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
242 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
243 | if (!msgheader) | |
d1c250bb | 244 | goto nomem; |
3e7ee490 | 245 | |
c50f7fb2 HZ |
246 | INIT_LIST_HEAD(&msgheader->submsglist); |
247 | msgheader->msgsize = msgsize; | |
3e7ee490 | 248 | |
39d70a4a | 249 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
250 | msgheader->msg; |
251 | gpadl_header->rangecount = 1; | |
252 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 253 | pagecount * sizeof(u64); |
415f2287 HZ |
254 | gpadl_header->range[0].byte_offset = 0; |
255 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 256 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
257 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
258 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
259 | *msginfo = msgheader; |
260 | *messagecount = 1; | |
3e7ee490 | 261 | |
39d70a4a HZ |
262 | pfnsum = pfncount; |
263 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 264 | |
454f18a9 | 265 | /* how many pfns can we fit */ |
39d70a4a | 266 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 267 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 268 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 269 | |
454f18a9 | 270 | /* fill in the body */ |
39d70a4a HZ |
271 | while (pfnleft) { |
272 | if (pfnleft > pfncount) | |
273 | pfncurr = pfncount; | |
3e7ee490 | 274 | else |
39d70a4a | 275 | pfncurr = pfnleft; |
3e7ee490 | 276 | |
39d70a4a | 277 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 278 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
279 | pfncurr * sizeof(u64); |
280 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
281 | |
282 | if (!msgbody) { | |
283 | struct vmbus_channel_msginfo *pos = NULL; | |
284 | struct vmbus_channel_msginfo *tmp = NULL; | |
285 | /* | |
286 | * Free up all the allocated messages. | |
287 | */ | |
288 | list_for_each_entry_safe(pos, tmp, | |
289 | &msgheader->submsglist, | |
290 | msglistentry) { | |
291 | ||
292 | list_del(&pos->msglistentry); | |
293 | kfree(pos); | |
294 | } | |
295 | ||
d1c250bb | 296 | goto nomem; |
f38cf9cc S |
297 | } |
298 | ||
c50f7fb2 | 299 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
300 | (*messagecount)++; |
301 | gpadl_body = | |
c50f7fb2 | 302 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
303 | |
304 | /* | |
f4266e34 GKH |
305 | * Gpadl is u32 and we are using a pointer which could |
306 | * be 64-bit | |
f27df643 S |
307 | * This is governed by the guest/host protocol and |
308 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 309 | */ |
39d70a4a | 310 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
311 | gpadl_body->pfn[i] = slow_virt_to_phys( |
312 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
313 | PAGE_SHIFT; | |
3e7ee490 | 314 | |
454f18a9 | 315 | /* add to msg header */ |
c50f7fb2 HZ |
316 | list_add_tail(&msgbody->msglistentry, |
317 | &msgheader->submsglist); | |
39d70a4a HZ |
318 | pfnsum += pfncurr; |
319 | pfnleft -= pfncurr; | |
3e7ee490 | 320 | } |
f4266e34 | 321 | } else { |
454f18a9 | 322 | /* everything fits in a header */ |
39d70a4a | 323 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 324 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
325 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
326 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
327 | if (msgheader == NULL) | |
e3eb7cdd | 328 | goto nomem; |
c50f7fb2 | 329 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
330 | |
331 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
332 | msgheader->msg; |
333 | gpadl_header->rangecount = 1; | |
334 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 335 | pagecount * sizeof(u64); |
415f2287 HZ |
336 | gpadl_header->range[0].byte_offset = 0; |
337 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 338 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
339 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
340 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
341 | |
342 | *msginfo = msgheader; | |
343 | *messagecount = 1; | |
3e7ee490 HJ |
344 | } |
345 | ||
346 | return 0; | |
d1c250bb | 347 | nomem: |
39d70a4a HZ |
348 | kfree(msgheader); |
349 | kfree(msgbody); | |
d1c250bb | 350 | return -ENOMEM; |
3e7ee490 HJ |
351 | } |
352 | ||
3e189519 | 353 | /* |
fff41b2e | 354 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 355 | * |
39d70a4a | 356 | * @channel: a channel |
b679ef73 | 357 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
358 | * @size: page-size multiple |
359 | * @gpadl_handle: some funky thing | |
f4266e34 | 360 | */ |
fff41b2e | 361 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 362 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 363 | { |
39d70a4a HZ |
364 | struct vmbus_channel_gpadl_header *gpadlmsg; |
365 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
366 | struct vmbus_channel_msginfo *msginfo = NULL; |
367 | struct vmbus_channel_msginfo *submsginfo; | |
368 | u32 msgcount; | |
53af545b | 369 | struct list_head *curr; |
39d70a4a | 370 | u32 next_gpadl_handle; |
dd0813b6 | 371 | unsigned long flags; |
c3bf2e26 | 372 | int ret = 0; |
3e7ee490 | 373 | |
9f52a163 S |
374 | next_gpadl_handle = |
375 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 376 | |
fff41b2e | 377 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
378 | if (ret) |
379 | return ret; | |
3e7ee490 | 380 | |
9568a193 | 381 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 382 | |
c50f7fb2 HZ |
383 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
384 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
385 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
386 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 387 | |
3e7ee490 | 388 | |
15b2f647 | 389 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 390 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 391 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 392 | |
15b2f647 | 393 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 394 | |
c6977677 | 395 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 396 | sizeof(*msginfo)); |
98e08702 | 397 | if (ret != 0) |
00d760b0 | 398 | goto cleanup; |
3e7ee490 | 399 | |
39d70a4a | 400 | if (msgcount > 1) { |
c50f7fb2 | 401 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 402 | |
39d70a4a HZ |
403 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
404 | gpadl_body = | |
c50f7fb2 | 405 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 406 | |
c50f7fb2 HZ |
407 | gpadl_body->header.msgtype = |
408 | CHANNELMSG_GPADL_BODY; | |
409 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 410 | |
c6977677 | 411 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 412 | submsginfo->msgsize - |
39d70a4a | 413 | sizeof(*submsginfo)); |
fd4dc88e | 414 | if (ret != 0) |
00d760b0 | 415 | goto cleanup; |
99259159 | 416 | |
3e7ee490 HJ |
417 | } |
418 | } | |
72c6b71c | 419 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 420 | |
454f18a9 | 421 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 422 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 423 | |
00d760b0 | 424 | cleanup: |
15b2f647 | 425 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 426 | list_del(&msginfo->msglistentry); |
15b2f647 | 427 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 428 | |
39d70a4a | 429 | kfree(msginfo); |
3e7ee490 HJ |
430 | return ret; |
431 | } | |
98873724 | 432 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 433 | |
3e189519 | 434 | /* |
fff41b2e | 435 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 436 | */ |
fff41b2e | 437 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 438 | { |
82250213 | 439 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 440 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 441 | unsigned long flags; |
66be6530 | 442 | int ret; |
3e7ee490 | 443 | |
f4266e34 GKH |
444 | info = kmalloc(sizeof(*info) + |
445 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
446 | if (!info) |
447 | return -ENOMEM; | |
3e7ee490 | 448 | |
9568a193 | 449 | init_completion(&info->waitevent); |
3e7ee490 | 450 | |
c50f7fb2 | 451 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 452 | |
c50f7fb2 HZ |
453 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
454 | msg->child_relid = channel->offermsg.child_relid; | |
455 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 456 | |
15b2f647 | 457 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 458 | list_add_tail(&info->msglistentry, |
da9fcb72 | 459 | &vmbus_connection.chn_msg_list); |
15b2f647 | 460 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 461 | ret = vmbus_post_msg(msg, |
f4266e34 | 462 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 463 | |
66be6530 S |
464 | if (ret) |
465 | goto post_msg_err; | |
466 | ||
467 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 468 | |
66be6530 | 469 | post_msg_err: |
15b2f647 | 470 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 471 | list_del(&info->msglistentry); |
15b2f647 | 472 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 473 | |
8c69f52a | 474 | kfree(info); |
3e7ee490 HJ |
475 | return ret; |
476 | } | |
18726d7a | 477 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 478 | |
d3ba720d S |
479 | static void reset_channel_cb(void *arg) |
480 | { | |
481 | struct vmbus_channel *channel = arg; | |
482 | ||
483 | channel->onchannel_callback = NULL; | |
484 | } | |
485 | ||
98d731bb | 486 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 487 | { |
82250213 | 488 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 489 | int ret; |
3e7ee490 | 490 | |
e68d2971 S |
491 | channel->state = CHANNEL_OPEN_STATE; |
492 | channel->sc_creation_callback = NULL; | |
454f18a9 | 493 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
494 | if (channel->target_cpu != get_cpu()) { |
495 | put_cpu(); | |
d3ba720d S |
496 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
497 | channel, true); | |
2115b561 | 498 | } else { |
d3ba720d | 499 | reset_channel_cb(channel); |
2115b561 S |
500 | put_cpu(); |
501 | } | |
3e7ee490 | 502 | |
454f18a9 | 503 | /* Send a closing message */ |
3e7ee490 | 504 | |
e9a27a9f | 505 | msg = &channel->close_msg.msg; |
3e7ee490 | 506 | |
c50f7fb2 HZ |
507 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
508 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 509 | |
c6977677 | 510 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 511 | |
98d731bb S |
512 | if (ret) { |
513 | pr_err("Close failed: close post msg return is %d\n", ret); | |
514 | /* | |
515 | * If we failed to post the close msg, | |
516 | * it is perhaps better to leak memory. | |
517 | */ | |
518 | return ret; | |
519 | } | |
520 | ||
454f18a9 | 521 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
522 | if (channel->ringbuffer_gpadlhandle) { |
523 | ret = vmbus_teardown_gpadl(channel, | |
524 | channel->ringbuffer_gpadlhandle); | |
525 | if (ret) { | |
526 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
527 | /* | |
528 | * If we failed to teardown gpadl, | |
529 | * it is perhaps better to leak memory. | |
530 | */ | |
531 | return ret; | |
532 | } | |
533 | } | |
3e7ee490 | 534 | |
454f18a9 | 535 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
536 | hv_ringbuffer_cleanup(&channel->outbound); |
537 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 538 | |
df3493e0 S |
539 | free_pages((unsigned long)channel->ringbuffer_pages, |
540 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 541 | |
f2eddbc9 S |
542 | /* |
543 | * If the channel has been rescinded; process device removal. | |
544 | */ | |
545 | if (channel->rescind) | |
546 | hv_process_channel_removal(channel, | |
547 | channel->offermsg.child_relid); | |
98d731bb | 548 | return ret; |
3e7ee490 | 549 | } |
e68d2971 S |
550 | |
551 | /* | |
552 | * vmbus_close - Close the specified channel | |
553 | */ | |
554 | void vmbus_close(struct vmbus_channel *channel) | |
555 | { | |
556 | struct list_head *cur, *tmp; | |
557 | struct vmbus_channel *cur_channel; | |
558 | ||
559 | if (channel->primary_channel != NULL) { | |
560 | /* | |
561 | * We will only close sub-channels when | |
562 | * the primary is closed. | |
563 | */ | |
564 | return; | |
565 | } | |
566 | /* | |
567 | * Close all the sub-channels first and then close the | |
568 | * primary channel. | |
569 | */ | |
570 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
571 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
572 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
573 | continue; | |
574 | vmbus_close_internal(cur_channel); | |
575 | } | |
576 | /* | |
577 | * Now close the primary. | |
578 | */ | |
579 | vmbus_close_internal(channel); | |
580 | } | |
70bfa307 | 581 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 582 | |
e9395e3f | 583 | int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 584 | u32 bufferlen, u64 requestid, |
e9395e3f | 585 | enum vmbus_packet_type type, u32 flags, bool kick_q) |
3e7ee490 | 586 | { |
8dc0a06a | 587 | struct vmpacket_descriptor desc; |
39d70a4a | 588 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 589 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 590 | struct kvec bufferlist[3]; |
39d70a4a | 591 | u64 aligned_data = 0; |
f4266e34 | 592 | int ret; |
98fa8cf4 | 593 | bool signal = false; |
3e7ee490 | 594 | |
3e7ee490 | 595 | |
454f18a9 | 596 | /* Setup the descriptor */ |
415f2287 HZ |
597 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
598 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 599 | /* in 8-bytes granularity */ |
415f2287 HZ |
600 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
601 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
602 | desc.trans_id = requestid; | |
3e7ee490 | 603 | |
011a7c3c S |
604 | bufferlist[0].iov_base = &desc; |
605 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
606 | bufferlist[1].iov_base = buffer; | |
607 | bufferlist[1].iov_len = bufferlen; | |
608 | bufferlist[2].iov_base = &aligned_data; | |
609 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 610 | |
98fa8cf4 | 611 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 612 | |
5f5cc817 S |
613 | /* |
614 | * Signalling the host is conditional on many factors: | |
615 | * 1. The ring state changed from being empty to non-empty. | |
616 | * This is tracked by the variable "signal". | |
617 | * 2. The variable kick_q tracks if more data will be placed | |
618 | * on the ring. We will not signal if more data is | |
619 | * to be placed. | |
620 | * | |
621 | * If we cannot write to the ring-buffer; signal the host | |
622 | * even if we may not have written anything. This is a rare | |
623 | * enough condition that it should not matter. | |
624 | */ | |
625 | if (((ret == 0) && kick_q && signal) || (ret)) | |
fff41b2e | 626 | vmbus_setevent(channel); |
3e7ee490 | 627 | |
3e7ee490 HJ |
628 | return ret; |
629 | } | |
e9395e3f S |
630 | EXPORT_SYMBOL(vmbus_sendpacket_ctl); |
631 | ||
632 | /** | |
633 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
634 | * @channel: Pointer to vmbus_channel structure. | |
635 | * @buffer: Pointer to the buffer you want to receive the data into. | |
636 | * @bufferlen: Maximum size of what the the buffer will hold | |
637 | * @requestid: Identifier of the request | |
638 | * @type: Type of packet that is being send e.g. negotiate, time | |
639 | * packet etc. | |
640 | * | |
641 | * Sends data in @buffer directly to hyper-v via the vmbus | |
642 | * This will send the data unparsed to hyper-v. | |
643 | * | |
644 | * Mainly used by Hyper-V drivers. | |
645 | */ | |
646 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
647 | u32 bufferlen, u64 requestid, | |
648 | enum vmbus_packet_type type, u32 flags) | |
649 | { | |
650 | return vmbus_sendpacket_ctl(channel, buffer, bufferlen, requestid, | |
651 | type, flags, true); | |
652 | } | |
fff41b2e | 653 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 654 | |
3e189519 | 655 | /* |
87e93d61 S |
656 | * vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer |
657 | * packets using a GPADL Direct packet type. This interface allows you | |
658 | * to control notifying the host. This will be useful for sending | |
659 | * batched data. Also the sender can control the send flags | |
660 | * explicitly. | |
f4266e34 | 661 | */ |
87e93d61 | 662 | int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel, |
39d70a4a HZ |
663 | struct hv_page_buffer pagebuffers[], |
664 | u32 pagecount, void *buffer, u32 bufferlen, | |
87e93d61 S |
665 | u64 requestid, |
666 | u32 flags, | |
667 | bool kick_q) | |
3e7ee490 | 668 | { |
f4266e34 GKH |
669 | int ret; |
670 | int i; | |
430a8e9a | 671 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
672 | u32 descsize; |
673 | u32 packetlen; | |
674 | u32 packetlen_aligned; | |
011a7c3c | 675 | struct kvec bufferlist[3]; |
39d70a4a | 676 | u64 aligned_data = 0; |
98fa8cf4 | 677 | bool signal = false; |
3e7ee490 | 678 | |
39d70a4a | 679 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 680 | return -EINVAL; |
3e7ee490 | 681 | |
3e7ee490 | 682 | |
f4266e34 | 683 | /* |
430a8e9a | 684 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
685 | * largest size we support |
686 | */ | |
39d70a4a HZ |
687 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
688 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 689 | sizeof(struct hv_page_buffer)); |
39d70a4a | 690 | packetlen = descsize + bufferlen; |
73509681 | 691 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 692 | |
454f18a9 | 693 | /* Setup the descriptor */ |
415f2287 | 694 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
87e93d61 | 695 | desc.flags = flags; |
39d70a4a HZ |
696 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
697 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
698 | desc.transactionid = requestid; | |
699 | desc.rangecount = pagecount; | |
700 | ||
701 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
702 | desc.range[i].len = pagebuffers[i].len; |
703 | desc.range[i].offset = pagebuffers[i].offset; | |
704 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
705 | } |
706 | ||
011a7c3c S |
707 | bufferlist[0].iov_base = &desc; |
708 | bufferlist[0].iov_len = descsize; | |
709 | bufferlist[1].iov_base = buffer; | |
710 | bufferlist[1].iov_len = bufferlen; | |
711 | bufferlist[2].iov_base = &aligned_data; | |
712 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 713 | |
98fa8cf4 | 714 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 715 | |
5f5cc817 S |
716 | /* |
717 | * Signalling the host is conditional on many factors: | |
718 | * 1. The ring state changed from being empty to non-empty. | |
719 | * This is tracked by the variable "signal". | |
720 | * 2. The variable kick_q tracks if more data will be placed | |
721 | * on the ring. We will not signal if more data is | |
722 | * to be placed. | |
723 | * | |
724 | * If we cannot write to the ring-buffer; signal the host | |
725 | * even if we may not have written anything. This is a rare | |
726 | * enough condition that it should not matter. | |
727 | */ | |
728 | if (((ret == 0) && kick_q && signal) || (ret)) | |
fff41b2e | 729 | vmbus_setevent(channel); |
3e7ee490 | 730 | |
3e7ee490 HJ |
731 | return ret; |
732 | } | |
b3a19b36 | 733 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer_ctl); |
87e93d61 S |
734 | |
735 | /* | |
736 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer | |
737 | * packets using a GPADL Direct packet type. | |
738 | */ | |
739 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, | |
740 | struct hv_page_buffer pagebuffers[], | |
741 | u32 pagecount, void *buffer, u32 bufferlen, | |
742 | u64 requestid) | |
743 | { | |
744 | u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
745 | return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount, | |
746 | buffer, bufferlen, requestid, | |
747 | flags, true); | |
748 | ||
749 | } | |
713efeb4 | 750 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 751 | |
d61031ee S |
752 | /* |
753 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
754 | * using a GPADL Direct packet type. | |
755 | * The buffer includes the vmbus descriptor. | |
756 | */ | |
757 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
758 | struct vmbus_packet_mpb_array *desc, | |
759 | u32 desc_size, | |
760 | void *buffer, u32 bufferlen, u64 requestid) | |
761 | { | |
762 | int ret; | |
763 | u32 packetlen; | |
764 | u32 packetlen_aligned; | |
765 | struct kvec bufferlist[3]; | |
766 | u64 aligned_data = 0; | |
767 | bool signal = false; | |
768 | ||
769 | packetlen = desc_size + bufferlen; | |
770 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
771 | ||
772 | /* Setup the descriptor */ | |
773 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
774 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
775 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
776 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
777 | desc->transactionid = requestid; | |
778 | desc->rangecount = 1; | |
779 | ||
780 | bufferlist[0].iov_base = desc; | |
781 | bufferlist[0].iov_len = desc_size; | |
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); | |
786 | ||
787 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); | |
788 | ||
789 | if (ret == 0 && signal) | |
790 | vmbus_setevent(channel); | |
791 | ||
792 | return ret; | |
793 | } | |
794 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
795 | ||
3e189519 | 796 | /* |
fff41b2e | 797 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 798 | * using a GPADL Direct packet type. |
f4266e34 | 799 | */ |
fff41b2e | 800 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
801 | struct hv_multipage_buffer *multi_pagebuffer, |
802 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 803 | { |
f4266e34 | 804 | int ret; |
430a8e9a | 805 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
806 | u32 descsize; |
807 | u32 packetlen; | |
808 | u32 packetlen_aligned; | |
011a7c3c | 809 | struct kvec bufferlist[3]; |
39d70a4a | 810 | u64 aligned_data = 0; |
98fa8cf4 | 811 | bool signal = false; |
ca623ad3 HZ |
812 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
813 | multi_pagebuffer->len); | |
3e7ee490 | 814 | |
24b8a406 | 815 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 816 | return -EINVAL; |
3e7ee490 | 817 | |
f4266e34 | 818 | /* |
430a8e9a | 819 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
820 | * the largest size we support |
821 | */ | |
39d70a4a HZ |
822 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
823 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 824 | sizeof(u64)); |
39d70a4a | 825 | packetlen = descsize + bufferlen; |
73509681 | 826 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 827 | |
3e7ee490 | 828 | |
454f18a9 | 829 | /* Setup the descriptor */ |
415f2287 | 830 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 831 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
832 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
833 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
834 | desc.transactionid = requestid; | |
430a8e9a | 835 | desc.rangecount = 1; |
3e7ee490 | 836 | |
ca623ad3 HZ |
837 | desc.range.len = multi_pagebuffer->len; |
838 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 839 | |
ca623ad3 | 840 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 841 | pfncount * sizeof(u64)); |
3e7ee490 | 842 | |
011a7c3c S |
843 | bufferlist[0].iov_base = &desc; |
844 | bufferlist[0].iov_len = descsize; | |
845 | bufferlist[1].iov_base = buffer; | |
846 | bufferlist[1].iov_len = bufferlen; | |
847 | bufferlist[2].iov_base = &aligned_data; | |
848 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 849 | |
98fa8cf4 | 850 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 851 | |
98fa8cf4 | 852 | if (ret == 0 && signal) |
fff41b2e | 853 | vmbus_setevent(channel); |
3e7ee490 | 854 | |
3e7ee490 HJ |
855 | return ret; |
856 | } | |
4cb106fa | 857 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
858 | |
859 | /** | |
fff41b2e | 860 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
861 | * @channel: Pointer to vmbus_channel structure. |
862 | * @buffer: Pointer to the buffer you want to receive the data into. | |
863 | * @bufferlen: Maximum size of what the the buffer will hold | |
864 | * @buffer_actual_len: The actual size of the data after it was received | |
865 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
866 | * |
867 | * Receives directly from the hyper-v vmbus and puts the data it received | |
868 | * into Buffer. This will receive the data unparsed from hyper-v. | |
869 | * | |
870 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 871 | */ |
fff41b2e | 872 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 873 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 874 | { |
8dc0a06a | 875 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
876 | u32 packetlen; |
877 | u32 userlen; | |
3e7ee490 | 878 | int ret; |
c2b8e520 | 879 | bool signal = false; |
3e7ee490 | 880 | |
39d70a4a HZ |
881 | *buffer_actual_len = 0; |
882 | *requestid = 0; | |
3e7ee490 | 883 | |
3e7ee490 | 884 | |
a89186c2 | 885 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 886 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 887 | if (ret != 0) |
3e7ee490 | 888 | return 0; |
3e7ee490 | 889 | |
415f2287 HZ |
890 | packetlen = desc.len8 << 3; |
891 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 892 | |
39d70a4a | 893 | *buffer_actual_len = userlen; |
3e7ee490 | 894 | |
39d70a4a | 895 | if (userlen > bufferlen) { |
3e7ee490 | 896 | |
0a46618d | 897 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 898 | bufferlen, userlen); |
926ae526 | 899 | return -ETOOSMALL; |
3e7ee490 HJ |
900 | } |
901 | ||
415f2287 | 902 | *requestid = desc.trans_id; |
3e7ee490 | 903 | |
454f18a9 | 904 | /* Copy over the packet to the user buffer */ |
38397c8a | 905 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 906 | (desc.offset8 << 3), &signal); |
3e7ee490 | 907 | |
c2b8e520 S |
908 | if (signal) |
909 | vmbus_setevent(channel); | |
3e7ee490 | 910 | |
3e7ee490 HJ |
911 | return 0; |
912 | } | |
fff41b2e | 913 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 914 | |
3e189519 | 915 | /* |
fff41b2e | 916 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 917 | */ |
fff41b2e | 918 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
919 | u32 bufferlen, u32 *buffer_actual_len, |
920 | u64 *requestid) | |
3e7ee490 | 921 | { |
8dc0a06a | 922 | struct vmpacket_descriptor desc; |
39d70a4a | 923 | u32 packetlen; |
3e7ee490 | 924 | int ret; |
c2b8e520 | 925 | bool signal = false; |
3e7ee490 | 926 | |
39d70a4a HZ |
927 | *buffer_actual_len = 0; |
928 | *requestid = 0; | |
3e7ee490 | 929 | |
3e7ee490 | 930 | |
a89186c2 | 931 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 932 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 933 | if (ret != 0) |
3e7ee490 | 934 | return 0; |
3e7ee490 | 935 | |
3e7ee490 | 936 | |
415f2287 | 937 | packetlen = desc.len8 << 3; |
3e7ee490 | 938 | |
39d70a4a | 939 | *buffer_actual_len = packetlen; |
3e7ee490 | 940 | |
7a446d63 | 941 | if (packetlen > bufferlen) |
3d5cad97 | 942 | return -ENOBUFS; |
3e7ee490 | 943 | |
415f2287 | 944 | *requestid = desc.trans_id; |
3e7ee490 | 945 | |
454f18a9 | 946 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
947 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
948 | &signal); | |
949 | ||
950 | if (signal) | |
951 | vmbus_setevent(channel); | |
3e7ee490 | 952 | |
33b06938 | 953 | return ret; |
3e7ee490 | 954 | } |
adaee6bd | 955 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |