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; | |
294409d2 | 76 | struct page *page; |
3e7ee490 | 77 | |
67fae053 | 78 | spin_lock_irqsave(&newchannel->lock, flags); |
e68d2971 S |
79 | if (newchannel->state == CHANNEL_OPEN_STATE) { |
80 | newchannel->state = CHANNEL_OPENING_STATE; | |
81 | } else { | |
67fae053 | 82 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 S |
83 | return -EINVAL; |
84 | } | |
67fae053 | 85 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 | 86 | |
c50f7fb2 HZ |
87 | newchannel->onchannel_callback = onchannelcallback; |
88 | newchannel->channel_callback_context = context; | |
3e7ee490 | 89 | |
454f18a9 | 90 | /* Allocate the ring buffer */ |
294409d2 S |
91 | page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), |
92 | GFP_KERNEL|__GFP_ZERO, | |
93 | get_order(send_ringbuffer_size + | |
94 | recv_ringbuffer_size)); | |
95 | ||
96 | if (!page) | |
97 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, | |
98 | get_order(send_ringbuffer_size + | |
99 | recv_ringbuffer_size)); | |
100 | else | |
101 | out = (void *)page_address(page); | |
df3493e0 | 102 | |
ac0d12b7 DC |
103 | if (!out) { |
104 | err = -ENOMEM; | |
105 | goto error0; | |
106 | } | |
3e7ee490 | 107 | |
39d70a4a | 108 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 109 | |
c50f7fb2 HZ |
110 | newchannel->ringbuffer_pages = out; |
111 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 112 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 113 | |
72a95cbc S |
114 | ret = hv_ringbuffer_init( |
115 | &newchannel->outbound, out, send_ringbuffer_size); | |
116 | ||
fd4dc88e | 117 | if (ret != 0) { |
3324fb40 | 118 | err = ret; |
13925502 | 119 | goto error0; |
3324fb40 BP |
120 | } |
121 | ||
72a95cbc S |
122 | ret = hv_ringbuffer_init( |
123 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 124 | if (ret != 0) { |
3324fb40 | 125 | err = ret; |
13925502 | 126 | goto error0; |
3324fb40 | 127 | } |
3e7ee490 | 128 | |
3e7ee490 | 129 | |
454f18a9 | 130 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 131 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 132 | |
fff41b2e | 133 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 134 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
135 | send_ringbuffer_size + |
136 | recv_ringbuffer_size, | |
c50f7fb2 | 137 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 138 | |
fd4dc88e | 139 | if (ret != 0) { |
b94ef345 | 140 | err = ret; |
13925502 | 141 | goto error0; |
b94ef345 | 142 | } |
f4266e34 | 143 | |
454f18a9 | 144 | /* Create and init the channel open message */ |
176fb9e3 | 145 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
146 | sizeof(struct vmbus_channel_open_channel), |
147 | GFP_KERNEL); | |
176fb9e3 | 148 | if (!open_info) { |
c3bf2e26 | 149 | err = -ENOMEM; |
40384e4b | 150 | goto error_gpadl; |
c3bf2e26 | 151 | } |
3e7ee490 | 152 | |
176fb9e3 | 153 | init_completion(&open_info->waitevent); |
3e7ee490 | 154 | |
176fb9e3 | 155 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
156 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
157 | open_msg->openid = newchannel->offermsg.child_relid; | |
158 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
159 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
160 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 161 | PAGE_SHIFT; |
abbf3b2a | 162 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 163 | |
39d70a4a | 164 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 165 | err = -EINVAL; |
40384e4b | 166 | goto error_gpadl; |
c827f944 BP |
167 | } |
168 | ||
39d70a4a | 169 | if (userdatalen) |
0987ff69 | 170 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 171 | |
15b2f647 | 172 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 173 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 174 | &vmbus_connection.chn_msg_list); |
15b2f647 | 175 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 176 | |
0987ff69 | 177 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 178 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 | 179 | |
45d727ce S |
180 | if (ret != 0) { |
181 | err = ret; | |
13925502 | 182 | goto error1; |
45d727ce | 183 | } |
3e7ee490 | 184 | |
176fb9e3 | 185 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 186 | if (t == 0) { |
0c3b7b2f | 187 | err = -ETIMEDOUT; |
13925502 | 188 | goto error1; |
0c3b7b2f S |
189 | } |
190 | ||
15b2f647 | 191 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 192 | list_del(&open_info->msglistentry); |
15b2f647 | 193 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 194 | |
ffc151f3 VK |
195 | if (open_info->response.open_result.status) { |
196 | err = -EAGAIN; | |
197 | goto error_gpadl; | |
198 | } | |
e68d2971 | 199 | |
ffc151f3 | 200 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 201 | kfree(open_info); |
ffc151f3 | 202 | return 0; |
c3bf2e26 | 203 | |
13925502 S |
204 | error1: |
205 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
206 | list_del(&open_info->msglistentry); | |
207 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
208 | ||
40384e4b S |
209 | error_gpadl: |
210 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); | |
211 | ||
13925502 | 212 | error0: |
df3493e0 S |
213 | free_pages((unsigned long)out, |
214 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 215 | kfree(open_info); |
ac0d12b7 | 216 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 217 | return err; |
3e7ee490 | 218 | } |
36ceadfc | 219 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 220 | |
3e189519 | 221 | /* |
fff41b2e | 222 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 223 | */ |
fff41b2e | 224 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
225 | struct vmbus_channel_msginfo **msginfo, |
226 | u32 *messagecount) | |
3e7ee490 HJ |
227 | { |
228 | int i; | |
39d70a4a | 229 | int pagecount; |
39d70a4a HZ |
230 | struct vmbus_channel_gpadl_header *gpadl_header; |
231 | struct vmbus_channel_gpadl_body *gpadl_body; | |
232 | struct vmbus_channel_msginfo *msgheader; | |
233 | struct vmbus_channel_msginfo *msgbody = NULL; | |
234 | u32 msgsize; | |
3e7ee490 | 235 | |
39d70a4a | 236 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 237 | |
39d70a4a | 238 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 239 | |
454f18a9 | 240 | /* do we need a gpadl body msg */ |
39d70a4a | 241 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
242 | sizeof(struct vmbus_channel_gpadl_header) - |
243 | sizeof(struct gpa_range); | |
39d70a4a | 244 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 245 | |
39d70a4a | 246 | if (pagecount > pfncount) { |
f4266e34 | 247 | /* we need a gpadl body */ |
454f18a9 | 248 | /* fill in the header */ |
39d70a4a | 249 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 250 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
251 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
252 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
253 | if (!msgheader) | |
d1c250bb | 254 | goto nomem; |
3e7ee490 | 255 | |
c50f7fb2 HZ |
256 | INIT_LIST_HEAD(&msgheader->submsglist); |
257 | msgheader->msgsize = msgsize; | |
3e7ee490 | 258 | |
39d70a4a | 259 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
260 | msgheader->msg; |
261 | gpadl_header->rangecount = 1; | |
262 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 263 | pagecount * sizeof(u64); |
415f2287 HZ |
264 | gpadl_header->range[0].byte_offset = 0; |
265 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 266 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
267 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
268 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
269 | *msginfo = msgheader; |
270 | *messagecount = 1; | |
3e7ee490 | 271 | |
39d70a4a HZ |
272 | pfnsum = pfncount; |
273 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 274 | |
454f18a9 | 275 | /* how many pfns can we fit */ |
39d70a4a | 276 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 277 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 278 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 279 | |
454f18a9 | 280 | /* fill in the body */ |
39d70a4a HZ |
281 | while (pfnleft) { |
282 | if (pfnleft > pfncount) | |
283 | pfncurr = pfncount; | |
3e7ee490 | 284 | else |
39d70a4a | 285 | pfncurr = pfnleft; |
3e7ee490 | 286 | |
39d70a4a | 287 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 288 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
289 | pfncurr * sizeof(u64); |
290 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
291 | |
292 | if (!msgbody) { | |
293 | struct vmbus_channel_msginfo *pos = NULL; | |
294 | struct vmbus_channel_msginfo *tmp = NULL; | |
295 | /* | |
296 | * Free up all the allocated messages. | |
297 | */ | |
298 | list_for_each_entry_safe(pos, tmp, | |
299 | &msgheader->submsglist, | |
300 | msglistentry) { | |
301 | ||
302 | list_del(&pos->msglistentry); | |
303 | kfree(pos); | |
304 | } | |
305 | ||
d1c250bb | 306 | goto nomem; |
f38cf9cc S |
307 | } |
308 | ||
c50f7fb2 | 309 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
310 | (*messagecount)++; |
311 | gpadl_body = | |
c50f7fb2 | 312 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
313 | |
314 | /* | |
f4266e34 GKH |
315 | * Gpadl is u32 and we are using a pointer which could |
316 | * be 64-bit | |
f27df643 S |
317 | * This is governed by the guest/host protocol and |
318 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 319 | */ |
39d70a4a | 320 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
321 | gpadl_body->pfn[i] = slow_virt_to_phys( |
322 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
323 | PAGE_SHIFT; | |
3e7ee490 | 324 | |
454f18a9 | 325 | /* add to msg header */ |
c50f7fb2 HZ |
326 | list_add_tail(&msgbody->msglistentry, |
327 | &msgheader->submsglist); | |
39d70a4a HZ |
328 | pfnsum += pfncurr; |
329 | pfnleft -= pfncurr; | |
3e7ee490 | 330 | } |
f4266e34 | 331 | } else { |
454f18a9 | 332 | /* everything fits in a header */ |
39d70a4a | 333 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 334 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
335 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
336 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
337 | if (msgheader == NULL) | |
e3eb7cdd | 338 | goto nomem; |
c50f7fb2 | 339 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
340 | |
341 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
342 | msgheader->msg; |
343 | gpadl_header->rangecount = 1; | |
344 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 345 | pagecount * sizeof(u64); |
415f2287 HZ |
346 | gpadl_header->range[0].byte_offset = 0; |
347 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 348 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
349 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
350 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
351 | |
352 | *msginfo = msgheader; | |
353 | *messagecount = 1; | |
3e7ee490 HJ |
354 | } |
355 | ||
356 | return 0; | |
d1c250bb | 357 | nomem: |
39d70a4a HZ |
358 | kfree(msgheader); |
359 | kfree(msgbody); | |
d1c250bb | 360 | return -ENOMEM; |
3e7ee490 HJ |
361 | } |
362 | ||
3e189519 | 363 | /* |
fff41b2e | 364 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 365 | * |
39d70a4a | 366 | * @channel: a channel |
b679ef73 | 367 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
368 | * @size: page-size multiple |
369 | * @gpadl_handle: some funky thing | |
f4266e34 | 370 | */ |
fff41b2e | 371 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 372 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 373 | { |
39d70a4a HZ |
374 | struct vmbus_channel_gpadl_header *gpadlmsg; |
375 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
376 | struct vmbus_channel_msginfo *msginfo = NULL; |
377 | struct vmbus_channel_msginfo *submsginfo; | |
378 | u32 msgcount; | |
53af545b | 379 | struct list_head *curr; |
39d70a4a | 380 | u32 next_gpadl_handle; |
dd0813b6 | 381 | unsigned long flags; |
c3bf2e26 | 382 | int ret = 0; |
3e7ee490 | 383 | |
9f52a163 S |
384 | next_gpadl_handle = |
385 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 386 | |
fff41b2e | 387 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
388 | if (ret) |
389 | return ret; | |
3e7ee490 | 390 | |
9568a193 | 391 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 392 | |
c50f7fb2 HZ |
393 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
394 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
395 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
396 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 397 | |
3e7ee490 | 398 | |
15b2f647 | 399 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 400 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 401 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 402 | |
15b2f647 | 403 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 404 | |
c6977677 | 405 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 406 | sizeof(*msginfo)); |
98e08702 | 407 | if (ret != 0) |
00d760b0 | 408 | goto cleanup; |
3e7ee490 | 409 | |
39d70a4a | 410 | if (msgcount > 1) { |
c50f7fb2 | 411 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 412 | |
39d70a4a HZ |
413 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
414 | gpadl_body = | |
c50f7fb2 | 415 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 416 | |
c50f7fb2 HZ |
417 | gpadl_body->header.msgtype = |
418 | CHANNELMSG_GPADL_BODY; | |
419 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 420 | |
c6977677 | 421 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 422 | submsginfo->msgsize - |
39d70a4a | 423 | sizeof(*submsginfo)); |
fd4dc88e | 424 | if (ret != 0) |
00d760b0 | 425 | goto cleanup; |
99259159 | 426 | |
3e7ee490 HJ |
427 | } |
428 | } | |
72c6b71c | 429 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 430 | |
454f18a9 | 431 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 432 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 433 | |
00d760b0 | 434 | cleanup: |
15b2f647 | 435 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 436 | list_del(&msginfo->msglistentry); |
15b2f647 | 437 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 438 | |
39d70a4a | 439 | kfree(msginfo); |
3e7ee490 HJ |
440 | return ret; |
441 | } | |
98873724 | 442 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 443 | |
3e189519 | 444 | /* |
fff41b2e | 445 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 446 | */ |
fff41b2e | 447 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 448 | { |
82250213 | 449 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 450 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 451 | unsigned long flags; |
66be6530 | 452 | int ret; |
3e7ee490 | 453 | |
f4266e34 GKH |
454 | info = kmalloc(sizeof(*info) + |
455 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
456 | if (!info) |
457 | return -ENOMEM; | |
3e7ee490 | 458 | |
9568a193 | 459 | init_completion(&info->waitevent); |
3e7ee490 | 460 | |
c50f7fb2 | 461 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 462 | |
c50f7fb2 HZ |
463 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
464 | msg->child_relid = channel->offermsg.child_relid; | |
465 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 466 | |
15b2f647 | 467 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 468 | list_add_tail(&info->msglistentry, |
da9fcb72 | 469 | &vmbus_connection.chn_msg_list); |
15b2f647 | 470 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 471 | ret = vmbus_post_msg(msg, |
f4266e34 | 472 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 473 | |
66be6530 S |
474 | if (ret) |
475 | goto post_msg_err; | |
476 | ||
477 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 478 | |
66be6530 | 479 | post_msg_err: |
15b2f647 | 480 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 481 | list_del(&info->msglistentry); |
15b2f647 | 482 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 483 | |
8c69f52a | 484 | kfree(info); |
3e7ee490 HJ |
485 | return ret; |
486 | } | |
18726d7a | 487 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 488 | |
d3ba720d S |
489 | static void reset_channel_cb(void *arg) |
490 | { | |
491 | struct vmbus_channel *channel = arg; | |
492 | ||
493 | channel->onchannel_callback = NULL; | |
494 | } | |
495 | ||
98d731bb | 496 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 497 | { |
82250213 | 498 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 499 | int ret; |
3e7ee490 | 500 | |
e68d2971 S |
501 | channel->state = CHANNEL_OPEN_STATE; |
502 | channel->sc_creation_callback = NULL; | |
454f18a9 | 503 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
504 | if (channel->target_cpu != get_cpu()) { |
505 | put_cpu(); | |
d3ba720d S |
506 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
507 | channel, true); | |
2115b561 | 508 | } else { |
d3ba720d | 509 | reset_channel_cb(channel); |
2115b561 S |
510 | put_cpu(); |
511 | } | |
3e7ee490 | 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 | |
f2eddbc9 S |
552 | /* |
553 | * If the channel has been rescinded; process device removal. | |
554 | */ | |
555 | if (channel->rescind) | |
556 | hv_process_channel_removal(channel, | |
557 | channel->offermsg.child_relid); | |
98d731bb | 558 | return ret; |
3e7ee490 | 559 | } |
e68d2971 S |
560 | |
561 | /* | |
562 | * vmbus_close - Close the specified channel | |
563 | */ | |
564 | void vmbus_close(struct vmbus_channel *channel) | |
565 | { | |
566 | struct list_head *cur, *tmp; | |
567 | struct vmbus_channel *cur_channel; | |
568 | ||
569 | if (channel->primary_channel != NULL) { | |
570 | /* | |
571 | * We will only close sub-channels when | |
572 | * the primary is closed. | |
573 | */ | |
574 | return; | |
575 | } | |
576 | /* | |
577 | * Close all the sub-channels first and then close the | |
578 | * primary channel. | |
579 | */ | |
580 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
581 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
582 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
583 | continue; | |
584 | vmbus_close_internal(cur_channel); | |
585 | } | |
586 | /* | |
587 | * Now close the primary. | |
588 | */ | |
589 | vmbus_close_internal(channel); | |
590 | } | |
70bfa307 | 591 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 592 | |
e9395e3f | 593 | int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 594 | u32 bufferlen, u64 requestid, |
e9395e3f | 595 | enum vmbus_packet_type type, u32 flags, bool kick_q) |
3e7ee490 | 596 | { |
8dc0a06a | 597 | struct vmpacket_descriptor desc; |
39d70a4a | 598 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 599 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 600 | struct kvec bufferlist[3]; |
39d70a4a | 601 | u64 aligned_data = 0; |
f4266e34 | 602 | int ret; |
98fa8cf4 | 603 | bool signal = false; |
3e7ee490 | 604 | |
3e7ee490 | 605 | |
454f18a9 | 606 | /* Setup the descriptor */ |
415f2287 HZ |
607 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
608 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 609 | /* in 8-bytes granularity */ |
415f2287 HZ |
610 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
611 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
612 | desc.trans_id = requestid; | |
3e7ee490 | 613 | |
011a7c3c S |
614 | bufferlist[0].iov_base = &desc; |
615 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
616 | bufferlist[1].iov_base = buffer; | |
617 | bufferlist[1].iov_len = bufferlen; | |
618 | bufferlist[2].iov_base = &aligned_data; | |
619 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 620 | |
98fa8cf4 | 621 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 622 | |
5f5cc817 S |
623 | /* |
624 | * Signalling the host is conditional on many factors: | |
625 | * 1. The ring state changed from being empty to non-empty. | |
626 | * This is tracked by the variable "signal". | |
627 | * 2. The variable kick_q tracks if more data will be placed | |
628 | * on the ring. We will not signal if more data is | |
629 | * to be placed. | |
630 | * | |
631 | * If we cannot write to the ring-buffer; signal the host | |
632 | * even if we may not have written anything. This is a rare | |
633 | * enough condition that it should not matter. | |
634 | */ | |
635 | if (((ret == 0) && kick_q && signal) || (ret)) | |
fff41b2e | 636 | vmbus_setevent(channel); |
3e7ee490 | 637 | |
3e7ee490 HJ |
638 | return ret; |
639 | } | |
e9395e3f S |
640 | EXPORT_SYMBOL(vmbus_sendpacket_ctl); |
641 | ||
642 | /** | |
643 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
644 | * @channel: Pointer to vmbus_channel structure. | |
645 | * @buffer: Pointer to the buffer you want to receive the data into. | |
646 | * @bufferlen: Maximum size of what the the buffer will hold | |
647 | * @requestid: Identifier of the request | |
648 | * @type: Type of packet that is being send e.g. negotiate, time | |
649 | * packet etc. | |
650 | * | |
651 | * Sends data in @buffer directly to hyper-v via the vmbus | |
652 | * This will send the data unparsed to hyper-v. | |
653 | * | |
654 | * Mainly used by Hyper-V drivers. | |
655 | */ | |
656 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
657 | u32 bufferlen, u64 requestid, | |
658 | enum vmbus_packet_type type, u32 flags) | |
659 | { | |
660 | return vmbus_sendpacket_ctl(channel, buffer, bufferlen, requestid, | |
661 | type, flags, true); | |
662 | } | |
fff41b2e | 663 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 664 | |
3e189519 | 665 | /* |
87e93d61 S |
666 | * vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer |
667 | * packets using a GPADL Direct packet type. This interface allows you | |
668 | * to control notifying the host. This will be useful for sending | |
669 | * batched data. Also the sender can control the send flags | |
670 | * explicitly. | |
f4266e34 | 671 | */ |
87e93d61 | 672 | int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel, |
39d70a4a HZ |
673 | struct hv_page_buffer pagebuffers[], |
674 | u32 pagecount, void *buffer, u32 bufferlen, | |
87e93d61 S |
675 | u64 requestid, |
676 | u32 flags, | |
677 | bool kick_q) | |
3e7ee490 | 678 | { |
f4266e34 GKH |
679 | int ret; |
680 | int i; | |
430a8e9a | 681 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
682 | u32 descsize; |
683 | u32 packetlen; | |
684 | u32 packetlen_aligned; | |
011a7c3c | 685 | struct kvec bufferlist[3]; |
39d70a4a | 686 | u64 aligned_data = 0; |
98fa8cf4 | 687 | bool signal = false; |
3e7ee490 | 688 | |
39d70a4a | 689 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 690 | return -EINVAL; |
3e7ee490 | 691 | |
3e7ee490 | 692 | |
f4266e34 | 693 | /* |
430a8e9a | 694 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
695 | * largest size we support |
696 | */ | |
39d70a4a HZ |
697 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
698 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 699 | sizeof(struct hv_page_buffer)); |
39d70a4a | 700 | packetlen = descsize + bufferlen; |
73509681 | 701 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 702 | |
454f18a9 | 703 | /* Setup the descriptor */ |
415f2287 | 704 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
87e93d61 | 705 | desc.flags = flags; |
39d70a4a HZ |
706 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
707 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
708 | desc.transactionid = requestid; | |
709 | desc.rangecount = pagecount; | |
710 | ||
711 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
712 | desc.range[i].len = pagebuffers[i].len; |
713 | desc.range[i].offset = pagebuffers[i].offset; | |
714 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
715 | } |
716 | ||
011a7c3c S |
717 | bufferlist[0].iov_base = &desc; |
718 | bufferlist[0].iov_len = descsize; | |
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); | |
3e7ee490 | 723 | |
98fa8cf4 | 724 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 725 | |
5f5cc817 S |
726 | /* |
727 | * Signalling the host is conditional on many factors: | |
728 | * 1. The ring state changed from being empty to non-empty. | |
729 | * This is tracked by the variable "signal". | |
730 | * 2. The variable kick_q tracks if more data will be placed | |
731 | * on the ring. We will not signal if more data is | |
732 | * to be placed. | |
733 | * | |
734 | * If we cannot write to the ring-buffer; signal the host | |
735 | * even if we may not have written anything. This is a rare | |
736 | * enough condition that it should not matter. | |
737 | */ | |
738 | if (((ret == 0) && kick_q && signal) || (ret)) | |
fff41b2e | 739 | vmbus_setevent(channel); |
3e7ee490 | 740 | |
3e7ee490 HJ |
741 | return ret; |
742 | } | |
b3a19b36 | 743 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer_ctl); |
87e93d61 S |
744 | |
745 | /* | |
746 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer | |
747 | * packets using a GPADL Direct packet type. | |
748 | */ | |
749 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, | |
750 | struct hv_page_buffer pagebuffers[], | |
751 | u32 pagecount, void *buffer, u32 bufferlen, | |
752 | u64 requestid) | |
753 | { | |
754 | u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
755 | return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount, | |
756 | buffer, bufferlen, requestid, | |
757 | flags, true); | |
758 | ||
759 | } | |
713efeb4 | 760 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 761 | |
d61031ee S |
762 | /* |
763 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
764 | * using a GPADL Direct packet type. | |
765 | * The buffer includes the vmbus descriptor. | |
766 | */ | |
767 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
768 | struct vmbus_packet_mpb_array *desc, | |
769 | u32 desc_size, | |
770 | void *buffer, u32 bufferlen, u64 requestid) | |
771 | { | |
772 | int ret; | |
773 | u32 packetlen; | |
774 | u32 packetlen_aligned; | |
775 | struct kvec bufferlist[3]; | |
776 | u64 aligned_data = 0; | |
777 | bool signal = false; | |
778 | ||
779 | packetlen = desc_size + bufferlen; | |
780 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
781 | ||
782 | /* Setup the descriptor */ | |
783 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
784 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
785 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
786 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
787 | desc->transactionid = requestid; | |
788 | desc->rangecount = 1; | |
789 | ||
790 | bufferlist[0].iov_base = desc; | |
791 | bufferlist[0].iov_len = desc_size; | |
792 | bufferlist[1].iov_base = buffer; | |
793 | bufferlist[1].iov_len = bufferlen; | |
794 | bufferlist[2].iov_base = &aligned_data; | |
795 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
796 | ||
797 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); | |
798 | ||
799 | if (ret == 0 && signal) | |
800 | vmbus_setevent(channel); | |
801 | ||
802 | return ret; | |
803 | } | |
804 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
805 | ||
3e189519 | 806 | /* |
fff41b2e | 807 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 808 | * using a GPADL Direct packet type. |
f4266e34 | 809 | */ |
fff41b2e | 810 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
811 | struct hv_multipage_buffer *multi_pagebuffer, |
812 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 813 | { |
f4266e34 | 814 | int ret; |
430a8e9a | 815 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
816 | u32 descsize; |
817 | u32 packetlen; | |
818 | u32 packetlen_aligned; | |
011a7c3c | 819 | struct kvec bufferlist[3]; |
39d70a4a | 820 | u64 aligned_data = 0; |
98fa8cf4 | 821 | bool signal = false; |
ca623ad3 HZ |
822 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
823 | multi_pagebuffer->len); | |
3e7ee490 | 824 | |
24b8a406 | 825 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 826 | return -EINVAL; |
3e7ee490 | 827 | |
f4266e34 | 828 | /* |
430a8e9a | 829 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
830 | * the largest size we support |
831 | */ | |
39d70a4a HZ |
832 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
833 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 834 | sizeof(u64)); |
39d70a4a | 835 | packetlen = descsize + bufferlen; |
73509681 | 836 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 837 | |
3e7ee490 | 838 | |
454f18a9 | 839 | /* Setup the descriptor */ |
415f2287 | 840 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 841 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
842 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
843 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
844 | desc.transactionid = requestid; | |
430a8e9a | 845 | desc.rangecount = 1; |
3e7ee490 | 846 | |
ca623ad3 HZ |
847 | desc.range.len = multi_pagebuffer->len; |
848 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 849 | |
ca623ad3 | 850 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 851 | pfncount * sizeof(u64)); |
3e7ee490 | 852 | |
011a7c3c S |
853 | bufferlist[0].iov_base = &desc; |
854 | bufferlist[0].iov_len = descsize; | |
855 | bufferlist[1].iov_base = buffer; | |
856 | bufferlist[1].iov_len = bufferlen; | |
857 | bufferlist[2].iov_base = &aligned_data; | |
858 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 859 | |
98fa8cf4 | 860 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 861 | |
98fa8cf4 | 862 | if (ret == 0 && signal) |
fff41b2e | 863 | vmbus_setevent(channel); |
3e7ee490 | 864 | |
3e7ee490 HJ |
865 | return ret; |
866 | } | |
4cb106fa | 867 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
868 | |
869 | /** | |
fff41b2e | 870 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
871 | * @channel: Pointer to vmbus_channel structure. |
872 | * @buffer: Pointer to the buffer you want to receive the data into. | |
873 | * @bufferlen: Maximum size of what the the buffer will hold | |
874 | * @buffer_actual_len: The actual size of the data after it was received | |
875 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
876 | * |
877 | * Receives directly from the hyper-v vmbus and puts the data it received | |
878 | * into Buffer. This will receive the data unparsed from hyper-v. | |
879 | * | |
880 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 881 | */ |
fff41b2e | 882 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 883 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 884 | { |
8dc0a06a | 885 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
886 | u32 packetlen; |
887 | u32 userlen; | |
3e7ee490 | 888 | int ret; |
c2b8e520 | 889 | bool signal = false; |
3e7ee490 | 890 | |
39d70a4a HZ |
891 | *buffer_actual_len = 0; |
892 | *requestid = 0; | |
3e7ee490 | 893 | |
3e7ee490 | 894 | |
a89186c2 | 895 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 896 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 897 | if (ret != 0) |
3e7ee490 | 898 | return 0; |
3e7ee490 | 899 | |
415f2287 HZ |
900 | packetlen = desc.len8 << 3; |
901 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 902 | |
39d70a4a | 903 | *buffer_actual_len = userlen; |
3e7ee490 | 904 | |
39d70a4a | 905 | if (userlen > bufferlen) { |
3e7ee490 | 906 | |
0a46618d | 907 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 908 | bufferlen, userlen); |
926ae526 | 909 | return -ETOOSMALL; |
3e7ee490 HJ |
910 | } |
911 | ||
415f2287 | 912 | *requestid = desc.trans_id; |
3e7ee490 | 913 | |
454f18a9 | 914 | /* Copy over the packet to the user buffer */ |
38397c8a | 915 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 916 | (desc.offset8 << 3), &signal); |
3e7ee490 | 917 | |
c2b8e520 S |
918 | if (signal) |
919 | vmbus_setevent(channel); | |
3e7ee490 | 920 | |
3e7ee490 HJ |
921 | return 0; |
922 | } | |
fff41b2e | 923 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 924 | |
3e189519 | 925 | /* |
fff41b2e | 926 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 927 | */ |
fff41b2e | 928 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
929 | u32 bufferlen, u32 *buffer_actual_len, |
930 | u64 *requestid) | |
3e7ee490 | 931 | { |
8dc0a06a | 932 | struct vmpacket_descriptor desc; |
39d70a4a | 933 | u32 packetlen; |
3e7ee490 | 934 | int ret; |
c2b8e520 | 935 | bool signal = false; |
3e7ee490 | 936 | |
39d70a4a HZ |
937 | *buffer_actual_len = 0; |
938 | *requestid = 0; | |
3e7ee490 | 939 | |
3e7ee490 | 940 | |
a89186c2 | 941 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 942 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 943 | if (ret != 0) |
3e7ee490 | 944 | return 0; |
3e7ee490 | 945 | |
3e7ee490 | 946 | |
415f2287 | 947 | packetlen = desc.len8 << 3; |
3e7ee490 | 948 | |
39d70a4a | 949 | *buffer_actual_len = packetlen; |
3e7ee490 | 950 | |
7a446d63 | 951 | if (packetlen > bufferlen) |
3d5cad97 | 952 | return -ENOBUFS; |
3e7ee490 | 953 | |
415f2287 | 954 | *requestid = desc.trans_id; |
3e7ee490 | 955 | |
454f18a9 | 956 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
957 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
958 | &signal); | |
959 | ||
960 | if (signal) | |
961 | vmbus_setevent(channel); | |
3e7ee490 | 962 | |
33b06938 | 963 | return ret; |
3e7ee490 | 964 | } |
adaee6bd | 965 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |