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> |
63d55b2a | 31 | #include <linux/interrupt.h> |
3f335ea2 | 32 | |
0f2a6619 | 33 | #include "hyperv_vmbus.h" |
3e7ee490 | 34 | |
e3fe0bb6 S |
35 | #define NUM_PAGES_SPANNED(addr, len) \ |
36 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
37 | ||
3e189519 | 38 | /* |
fff41b2e | 39 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 40 | * channel. |
f4266e34 | 41 | */ |
fff41b2e | 42 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 43 | { |
39d70a4a | 44 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 45 | |
c50f7fb2 | 46 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 47 | /* Each u32 represents 32 channels */ |
22356585 | 48 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 49 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 50 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 51 | |
8681db44 GKH |
52 | /* Get the child to parent monitor page */ |
53 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 54 | |
22356585 | 55 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
56 | (unsigned long *)&monitorpage->trigger_group |
57 | [channel->monitor_grp].pending); | |
7c369f40 | 58 | |
f4266e34 | 59 | } else { |
21c3bef5 | 60 | vmbus_set_event(channel); |
3e7ee490 | 61 | } |
3e7ee490 HJ |
62 | } |
63 | ||
3e189519 | 64 | /* |
fff41b2e | 65 | * vmbus_open - Open the specified channel. |
f4266e34 | 66 | */ |
fff41b2e | 67 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
68 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
69 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 70 | { |
0987ff69 | 71 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 72 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 73 | void *in, *out; |
dd0813b6 | 74 | unsigned long flags; |
08a9513f NMG |
75 | int ret, err = 0; |
76 | unsigned long t; | |
294409d2 | 77 | struct page *page; |
3e7ee490 | 78 | |
67fae053 | 79 | spin_lock_irqsave(&newchannel->lock, flags); |
e68d2971 S |
80 | if (newchannel->state == CHANNEL_OPEN_STATE) { |
81 | newchannel->state = CHANNEL_OPENING_STATE; | |
82 | } else { | |
67fae053 | 83 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 S |
84 | return -EINVAL; |
85 | } | |
67fae053 | 86 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 | 87 | |
c50f7fb2 HZ |
88 | newchannel->onchannel_callback = onchannelcallback; |
89 | newchannel->channel_callback_context = context; | |
3e7ee490 | 90 | |
454f18a9 | 91 | /* Allocate the ring buffer */ |
294409d2 S |
92 | page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), |
93 | GFP_KERNEL|__GFP_ZERO, | |
94 | get_order(send_ringbuffer_size + | |
95 | recv_ringbuffer_size)); | |
96 | ||
97 | if (!page) | |
98 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, | |
99 | get_order(send_ringbuffer_size + | |
100 | recv_ringbuffer_size)); | |
101 | else | |
102 | out = (void *)page_address(page); | |
df3493e0 | 103 | |
ac0d12b7 DC |
104 | if (!out) { |
105 | err = -ENOMEM; | |
106 | goto error0; | |
107 | } | |
3e7ee490 | 108 | |
39d70a4a | 109 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 110 | |
c50f7fb2 HZ |
111 | newchannel->ringbuffer_pages = out; |
112 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 113 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 114 | |
72a95cbc S |
115 | ret = hv_ringbuffer_init( |
116 | &newchannel->outbound, out, send_ringbuffer_size); | |
117 | ||
fd4dc88e | 118 | if (ret != 0) { |
3324fb40 | 119 | err = ret; |
13925502 | 120 | goto error0; |
3324fb40 BP |
121 | } |
122 | ||
72a95cbc S |
123 | ret = hv_ringbuffer_init( |
124 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 125 | if (ret != 0) { |
3324fb40 | 126 | err = ret; |
13925502 | 127 | goto error0; |
3324fb40 | 128 | } |
3e7ee490 | 129 | |
3e7ee490 | 130 | |
454f18a9 | 131 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 132 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 133 | |
fff41b2e | 134 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 135 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
136 | send_ringbuffer_size + |
137 | recv_ringbuffer_size, | |
c50f7fb2 | 138 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 139 | |
fd4dc88e | 140 | if (ret != 0) { |
b94ef345 | 141 | err = ret; |
13925502 | 142 | goto error0; |
b94ef345 | 143 | } |
f4266e34 | 144 | |
454f18a9 | 145 | /* Create and init the channel open message */ |
176fb9e3 | 146 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
147 | sizeof(struct vmbus_channel_open_channel), |
148 | GFP_KERNEL); | |
176fb9e3 | 149 | if (!open_info) { |
c3bf2e26 | 150 | err = -ENOMEM; |
40384e4b | 151 | goto error_gpadl; |
c3bf2e26 | 152 | } |
3e7ee490 | 153 | |
176fb9e3 | 154 | init_completion(&open_info->waitevent); |
3e7ee490 | 155 | |
176fb9e3 | 156 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
157 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
158 | open_msg->openid = newchannel->offermsg.child_relid; | |
159 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
160 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
161 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 162 | PAGE_SHIFT; |
abbf3b2a | 163 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 164 | |
39d70a4a | 165 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 166 | err = -EINVAL; |
40384e4b | 167 | goto error_gpadl; |
c827f944 BP |
168 | } |
169 | ||
39d70a4a | 170 | if (userdatalen) |
0987ff69 | 171 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 172 | |
15b2f647 | 173 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 174 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 175 | &vmbus_connection.chn_msg_list); |
15b2f647 | 176 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 177 | |
0987ff69 | 178 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 179 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 | 180 | |
45d727ce S |
181 | if (ret != 0) { |
182 | err = ret; | |
13925502 | 183 | goto error1; |
45d727ce | 184 | } |
3e7ee490 | 185 | |
176fb9e3 | 186 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 187 | if (t == 0) { |
0c3b7b2f | 188 | err = -ETIMEDOUT; |
13925502 | 189 | goto error1; |
0c3b7b2f S |
190 | } |
191 | ||
15b2f647 | 192 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 193 | list_del(&open_info->msglistentry); |
15b2f647 | 194 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 195 | |
ffc151f3 VK |
196 | if (open_info->response.open_result.status) { |
197 | err = -EAGAIN; | |
198 | goto error_gpadl; | |
199 | } | |
e68d2971 | 200 | |
ffc151f3 | 201 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 202 | kfree(open_info); |
ffc151f3 | 203 | return 0; |
c3bf2e26 | 204 | |
13925502 S |
205 | error1: |
206 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
207 | list_del(&open_info->msglistentry); | |
208 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
209 | ||
40384e4b S |
210 | error_gpadl: |
211 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); | |
212 | ||
13925502 | 213 | error0: |
df3493e0 S |
214 | free_pages((unsigned long)out, |
215 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 216 | kfree(open_info); |
ac0d12b7 | 217 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 218 | return err; |
3e7ee490 | 219 | } |
36ceadfc | 220 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 221 | |
3e189519 | 222 | /* |
fff41b2e | 223 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 224 | */ |
fff41b2e | 225 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
226 | struct vmbus_channel_msginfo **msginfo, |
227 | u32 *messagecount) | |
3e7ee490 HJ |
228 | { |
229 | int i; | |
39d70a4a | 230 | int pagecount; |
39d70a4a HZ |
231 | struct vmbus_channel_gpadl_header *gpadl_header; |
232 | struct vmbus_channel_gpadl_body *gpadl_body; | |
233 | struct vmbus_channel_msginfo *msgheader; | |
234 | struct vmbus_channel_msginfo *msgbody = NULL; | |
235 | u32 msgsize; | |
3e7ee490 | 236 | |
39d70a4a | 237 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 238 | |
39d70a4a | 239 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 240 | |
454f18a9 | 241 | /* do we need a gpadl body msg */ |
39d70a4a | 242 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
243 | sizeof(struct vmbus_channel_gpadl_header) - |
244 | sizeof(struct gpa_range); | |
39d70a4a | 245 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 246 | |
39d70a4a | 247 | if (pagecount > pfncount) { |
f4266e34 | 248 | /* we need a gpadl body */ |
454f18a9 | 249 | /* fill in the header */ |
39d70a4a | 250 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 251 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
252 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
253 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
254 | if (!msgheader) | |
d1c250bb | 255 | goto nomem; |
3e7ee490 | 256 | |
c50f7fb2 HZ |
257 | INIT_LIST_HEAD(&msgheader->submsglist); |
258 | msgheader->msgsize = msgsize; | |
3e7ee490 | 259 | |
39d70a4a | 260 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
261 | msgheader->msg; |
262 | gpadl_header->rangecount = 1; | |
263 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 264 | pagecount * sizeof(u64); |
415f2287 HZ |
265 | gpadl_header->range[0].byte_offset = 0; |
266 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 267 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
268 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
269 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
270 | *msginfo = msgheader; |
271 | *messagecount = 1; | |
3e7ee490 | 272 | |
39d70a4a HZ |
273 | pfnsum = pfncount; |
274 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 275 | |
454f18a9 | 276 | /* how many pfns can we fit */ |
39d70a4a | 277 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 278 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 279 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 280 | |
454f18a9 | 281 | /* fill in the body */ |
39d70a4a HZ |
282 | while (pfnleft) { |
283 | if (pfnleft > pfncount) | |
284 | pfncurr = pfncount; | |
3e7ee490 | 285 | else |
39d70a4a | 286 | pfncurr = pfnleft; |
3e7ee490 | 287 | |
39d70a4a | 288 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 289 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
290 | pfncurr * sizeof(u64); |
291 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
292 | |
293 | if (!msgbody) { | |
294 | struct vmbus_channel_msginfo *pos = NULL; | |
295 | struct vmbus_channel_msginfo *tmp = NULL; | |
296 | /* | |
297 | * Free up all the allocated messages. | |
298 | */ | |
299 | list_for_each_entry_safe(pos, tmp, | |
300 | &msgheader->submsglist, | |
301 | msglistentry) { | |
302 | ||
303 | list_del(&pos->msglistentry); | |
304 | kfree(pos); | |
305 | } | |
306 | ||
d1c250bb | 307 | goto nomem; |
f38cf9cc S |
308 | } |
309 | ||
c50f7fb2 | 310 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
311 | (*messagecount)++; |
312 | gpadl_body = | |
c50f7fb2 | 313 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
314 | |
315 | /* | |
f4266e34 GKH |
316 | * Gpadl is u32 and we are using a pointer which could |
317 | * be 64-bit | |
f27df643 S |
318 | * This is governed by the guest/host protocol and |
319 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 320 | */ |
39d70a4a | 321 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
322 | gpadl_body->pfn[i] = slow_virt_to_phys( |
323 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
324 | PAGE_SHIFT; | |
3e7ee490 | 325 | |
454f18a9 | 326 | /* add to msg header */ |
c50f7fb2 HZ |
327 | list_add_tail(&msgbody->msglistentry, |
328 | &msgheader->submsglist); | |
39d70a4a HZ |
329 | pfnsum += pfncurr; |
330 | pfnleft -= pfncurr; | |
3e7ee490 | 331 | } |
f4266e34 | 332 | } else { |
454f18a9 | 333 | /* everything fits in a header */ |
39d70a4a | 334 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 335 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
336 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
337 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
338 | if (msgheader == NULL) | |
e3eb7cdd | 339 | goto nomem; |
c50f7fb2 | 340 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
341 | |
342 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
343 | msgheader->msg; |
344 | gpadl_header->rangecount = 1; | |
345 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 346 | pagecount * sizeof(u64); |
415f2287 HZ |
347 | gpadl_header->range[0].byte_offset = 0; |
348 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 349 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
350 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
351 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
352 | |
353 | *msginfo = msgheader; | |
354 | *messagecount = 1; | |
3e7ee490 HJ |
355 | } |
356 | ||
357 | return 0; | |
d1c250bb | 358 | nomem: |
39d70a4a HZ |
359 | kfree(msgheader); |
360 | kfree(msgbody); | |
d1c250bb | 361 | return -ENOMEM; |
3e7ee490 HJ |
362 | } |
363 | ||
3e189519 | 364 | /* |
fff41b2e | 365 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 366 | * |
39d70a4a | 367 | * @channel: a channel |
b679ef73 | 368 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
369 | * @size: page-size multiple |
370 | * @gpadl_handle: some funky thing | |
f4266e34 | 371 | */ |
fff41b2e | 372 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 373 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 374 | { |
39d70a4a HZ |
375 | struct vmbus_channel_gpadl_header *gpadlmsg; |
376 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
377 | struct vmbus_channel_msginfo *msginfo = NULL; |
378 | struct vmbus_channel_msginfo *submsginfo; | |
379 | u32 msgcount; | |
53af545b | 380 | struct list_head *curr; |
39d70a4a | 381 | u32 next_gpadl_handle; |
dd0813b6 | 382 | unsigned long flags; |
c3bf2e26 | 383 | int ret = 0; |
3e7ee490 | 384 | |
9f52a163 S |
385 | next_gpadl_handle = |
386 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 387 | |
fff41b2e | 388 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
389 | if (ret) |
390 | return ret; | |
3e7ee490 | 391 | |
9568a193 | 392 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 393 | |
c50f7fb2 HZ |
394 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
395 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
396 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
397 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 398 | |
3e7ee490 | 399 | |
15b2f647 | 400 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 401 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 402 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 403 | |
15b2f647 | 404 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 405 | |
c6977677 | 406 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 407 | sizeof(*msginfo)); |
98e08702 | 408 | if (ret != 0) |
00d760b0 | 409 | goto cleanup; |
3e7ee490 | 410 | |
39d70a4a | 411 | if (msgcount > 1) { |
c50f7fb2 | 412 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 413 | |
39d70a4a HZ |
414 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
415 | gpadl_body = | |
c50f7fb2 | 416 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 417 | |
c50f7fb2 HZ |
418 | gpadl_body->header.msgtype = |
419 | CHANNELMSG_GPADL_BODY; | |
420 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 421 | |
c6977677 | 422 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 423 | submsginfo->msgsize - |
39d70a4a | 424 | sizeof(*submsginfo)); |
fd4dc88e | 425 | if (ret != 0) |
00d760b0 | 426 | goto cleanup; |
99259159 | 427 | |
3e7ee490 HJ |
428 | } |
429 | } | |
72c6b71c | 430 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 431 | |
454f18a9 | 432 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 433 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 434 | |
00d760b0 | 435 | cleanup: |
15b2f647 | 436 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 437 | list_del(&msginfo->msglistentry); |
15b2f647 | 438 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 439 | |
39d70a4a | 440 | kfree(msginfo); |
3e7ee490 HJ |
441 | return ret; |
442 | } | |
98873724 | 443 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 444 | |
3e189519 | 445 | /* |
fff41b2e | 446 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 447 | */ |
fff41b2e | 448 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 449 | { |
82250213 | 450 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 451 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 452 | unsigned long flags; |
66be6530 | 453 | int ret; |
3e7ee490 | 454 | |
f4266e34 GKH |
455 | info = kmalloc(sizeof(*info) + |
456 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
457 | if (!info) |
458 | return -ENOMEM; | |
3e7ee490 | 459 | |
9568a193 | 460 | init_completion(&info->waitevent); |
3e7ee490 | 461 | |
c50f7fb2 | 462 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 463 | |
c50f7fb2 HZ |
464 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
465 | msg->child_relid = channel->offermsg.child_relid; | |
466 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 467 | |
15b2f647 | 468 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 469 | list_add_tail(&info->msglistentry, |
da9fcb72 | 470 | &vmbus_connection.chn_msg_list); |
15b2f647 | 471 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 472 | ret = vmbus_post_msg(msg, |
f4266e34 | 473 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 474 | |
66be6530 S |
475 | if (ret) |
476 | goto post_msg_err; | |
477 | ||
478 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 479 | |
66be6530 | 480 | post_msg_err: |
15b2f647 | 481 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 482 | list_del(&info->msglistentry); |
15b2f647 | 483 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 484 | |
8c69f52a | 485 | kfree(info); |
3e7ee490 HJ |
486 | return ret; |
487 | } | |
18726d7a | 488 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 489 | |
d3ba720d S |
490 | static void reset_channel_cb(void *arg) |
491 | { | |
492 | struct vmbus_channel *channel = arg; | |
493 | ||
494 | channel->onchannel_callback = NULL; | |
495 | } | |
496 | ||
98d731bb | 497 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 498 | { |
82250213 | 499 | struct vmbus_channel_close_channel *msg; |
63d55b2a | 500 | struct tasklet_struct *tasklet; |
f4266e34 | 501 | int ret; |
3e7ee490 | 502 | |
63d55b2a DC |
503 | /* |
504 | * process_chn_event(), running in the tasklet, can race | |
505 | * with vmbus_close_internal() in the case of SMP guest, e.g., when | |
506 | * the former is accessing channel->inbound.ring_buffer, the latter | |
507 | * could be freeing the ring_buffer pages. | |
508 | * | |
509 | * To resolve the race, we can serialize them by disabling the | |
510 | * tasklet when the latter is running here. | |
511 | */ | |
512 | tasklet = hv_context.event_dpc[channel->target_cpu]; | |
513 | tasklet_disable(tasklet); | |
514 | ||
64b7faf9 DC |
515 | /* |
516 | * In case a device driver's probe() fails (e.g., | |
517 | * util_probe() -> vmbus_open() returns -ENOMEM) and the device is | |
518 | * rescinded later (e.g., we dynamically disble an Integrated Service | |
519 | * in Hyper-V Manager), the driver's remove() invokes vmbus_close(): | |
520 | * here we should skip most of the below cleanup work. | |
521 | */ | |
522 | if (channel->state != CHANNEL_OPENED_STATE) { | |
523 | ret = -EINVAL; | |
524 | goto out; | |
525 | } | |
526 | ||
e68d2971 S |
527 | channel->state = CHANNEL_OPEN_STATE; |
528 | channel->sc_creation_callback = NULL; | |
454f18a9 | 529 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
530 | if (channel->target_cpu != get_cpu()) { |
531 | put_cpu(); | |
d3ba720d S |
532 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
533 | channel, true); | |
2115b561 | 534 | } else { |
d3ba720d | 535 | reset_channel_cb(channel); |
2115b561 S |
536 | put_cpu(); |
537 | } | |
3e7ee490 | 538 | |
454f18a9 | 539 | /* Send a closing message */ |
3e7ee490 | 540 | |
e9a27a9f | 541 | msg = &channel->close_msg.msg; |
3e7ee490 | 542 | |
c50f7fb2 HZ |
543 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
544 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 545 | |
c6977677 | 546 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 547 | |
98d731bb S |
548 | if (ret) { |
549 | pr_err("Close failed: close post msg return is %d\n", ret); | |
550 | /* | |
551 | * If we failed to post the close msg, | |
552 | * it is perhaps better to leak memory. | |
553 | */ | |
63d55b2a | 554 | goto out; |
98d731bb S |
555 | } |
556 | ||
454f18a9 | 557 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
558 | if (channel->ringbuffer_gpadlhandle) { |
559 | ret = vmbus_teardown_gpadl(channel, | |
560 | channel->ringbuffer_gpadlhandle); | |
561 | if (ret) { | |
562 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
563 | /* | |
564 | * If we failed to teardown gpadl, | |
565 | * it is perhaps better to leak memory. | |
566 | */ | |
63d55b2a | 567 | goto out; |
98d731bb S |
568 | } |
569 | } | |
3e7ee490 | 570 | |
454f18a9 | 571 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
572 | hv_ringbuffer_cleanup(&channel->outbound); |
573 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 574 | |
df3493e0 S |
575 | free_pages((unsigned long)channel->ringbuffer_pages, |
576 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 577 | |
63d55b2a DC |
578 | out: |
579 | tasklet_enable(tasklet); | |
580 | ||
98d731bb | 581 | return ret; |
3e7ee490 | 582 | } |
e68d2971 S |
583 | |
584 | /* | |
585 | * vmbus_close - Close the specified channel | |
586 | */ | |
587 | void vmbus_close(struct vmbus_channel *channel) | |
588 | { | |
589 | struct list_head *cur, *tmp; | |
590 | struct vmbus_channel *cur_channel; | |
591 | ||
592 | if (channel->primary_channel != NULL) { | |
593 | /* | |
594 | * We will only close sub-channels when | |
595 | * the primary is closed. | |
596 | */ | |
597 | return; | |
598 | } | |
599 | /* | |
600 | * Close all the sub-channels first and then close the | |
601 | * primary channel. | |
602 | */ | |
603 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
604 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
605 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
606 | continue; | |
607 | vmbus_close_internal(cur_channel); | |
608 | } | |
609 | /* | |
610 | * Now close the primary. | |
611 | */ | |
612 | vmbus_close_internal(channel); | |
613 | } | |
70bfa307 | 614 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 615 | |
e9395e3f | 616 | int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 617 | u32 bufferlen, u64 requestid, |
e9395e3f | 618 | enum vmbus_packet_type type, u32 flags, bool kick_q) |
3e7ee490 | 619 | { |
8dc0a06a | 620 | struct vmpacket_descriptor desc; |
39d70a4a | 621 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 622 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 623 | struct kvec bufferlist[3]; |
39d70a4a | 624 | u64 aligned_data = 0; |
f4266e34 | 625 | int ret; |
98fa8cf4 | 626 | bool signal = false; |
b81658cf | 627 | int num_vecs = ((bufferlen != 0) ? 3 : 1); |
3e7ee490 | 628 | |
3e7ee490 | 629 | |
454f18a9 | 630 | /* Setup the descriptor */ |
415f2287 HZ |
631 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
632 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 633 | /* in 8-bytes granularity */ |
415f2287 HZ |
634 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
635 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
636 | desc.trans_id = requestid; | |
3e7ee490 | 637 | |
011a7c3c S |
638 | bufferlist[0].iov_base = &desc; |
639 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
640 | bufferlist[1].iov_base = buffer; | |
641 | bufferlist[1].iov_len = bufferlen; | |
642 | bufferlist[2].iov_base = &aligned_data; | |
643 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 644 | |
b81658cf S |
645 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, num_vecs, |
646 | &signal); | |
3e7ee490 | 647 | |
5f5cc817 S |
648 | /* |
649 | * Signalling the host is conditional on many factors: | |
650 | * 1. The ring state changed from being empty to non-empty. | |
651 | * This is tracked by the variable "signal". | |
652 | * 2. The variable kick_q tracks if more data will be placed | |
653 | * on the ring. We will not signal if more data is | |
654 | * to be placed. | |
655 | * | |
656 | * If we cannot write to the ring-buffer; signal the host | |
657 | * even if we may not have written anything. This is a rare | |
658 | * enough condition that it should not matter. | |
659 | */ | |
660 | if (((ret == 0) && kick_q && signal) || (ret)) | |
fff41b2e | 661 | vmbus_setevent(channel); |
3e7ee490 | 662 | |
3e7ee490 HJ |
663 | return ret; |
664 | } | |
e9395e3f S |
665 | EXPORT_SYMBOL(vmbus_sendpacket_ctl); |
666 | ||
667 | /** | |
668 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
669 | * @channel: Pointer to vmbus_channel structure. | |
670 | * @buffer: Pointer to the buffer you want to receive the data into. | |
671 | * @bufferlen: Maximum size of what the the buffer will hold | |
672 | * @requestid: Identifier of the request | |
673 | * @type: Type of packet that is being send e.g. negotiate, time | |
674 | * packet etc. | |
675 | * | |
676 | * Sends data in @buffer directly to hyper-v via the vmbus | |
677 | * This will send the data unparsed to hyper-v. | |
678 | * | |
679 | * Mainly used by Hyper-V drivers. | |
680 | */ | |
681 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
682 | u32 bufferlen, u64 requestid, | |
683 | enum vmbus_packet_type type, u32 flags) | |
684 | { | |
685 | return vmbus_sendpacket_ctl(channel, buffer, bufferlen, requestid, | |
686 | type, flags, true); | |
687 | } | |
fff41b2e | 688 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 689 | |
3e189519 | 690 | /* |
87e93d61 S |
691 | * vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer |
692 | * packets using a GPADL Direct packet type. This interface allows you | |
693 | * to control notifying the host. This will be useful for sending | |
694 | * batched data. Also the sender can control the send flags | |
695 | * explicitly. | |
f4266e34 | 696 | */ |
87e93d61 | 697 | int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel, |
39d70a4a HZ |
698 | struct hv_page_buffer pagebuffers[], |
699 | u32 pagecount, void *buffer, u32 bufferlen, | |
87e93d61 S |
700 | u64 requestid, |
701 | u32 flags, | |
702 | bool kick_q) | |
3e7ee490 | 703 | { |
f4266e34 GKH |
704 | int ret; |
705 | int i; | |
430a8e9a | 706 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
707 | u32 descsize; |
708 | u32 packetlen; | |
709 | u32 packetlen_aligned; | |
011a7c3c | 710 | struct kvec bufferlist[3]; |
39d70a4a | 711 | u64 aligned_data = 0; |
98fa8cf4 | 712 | bool signal = false; |
3e7ee490 | 713 | |
39d70a4a | 714 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 715 | return -EINVAL; |
3e7ee490 | 716 | |
3e7ee490 | 717 | |
f4266e34 | 718 | /* |
430a8e9a | 719 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
720 | * largest size we support |
721 | */ | |
39d70a4a HZ |
722 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
723 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 724 | sizeof(struct hv_page_buffer)); |
39d70a4a | 725 | packetlen = descsize + bufferlen; |
73509681 | 726 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 727 | |
454f18a9 | 728 | /* Setup the descriptor */ |
415f2287 | 729 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
87e93d61 | 730 | desc.flags = flags; |
39d70a4a HZ |
731 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
732 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
733 | desc.transactionid = requestid; | |
734 | desc.rangecount = pagecount; | |
735 | ||
736 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
737 | desc.range[i].len = pagebuffers[i].len; |
738 | desc.range[i].offset = pagebuffers[i].offset; | |
739 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
740 | } |
741 | ||
011a7c3c S |
742 | bufferlist[0].iov_base = &desc; |
743 | bufferlist[0].iov_len = descsize; | |
744 | bufferlist[1].iov_base = buffer; | |
745 | bufferlist[1].iov_len = bufferlen; | |
746 | bufferlist[2].iov_base = &aligned_data; | |
747 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 748 | |
98fa8cf4 | 749 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 750 | |
5f5cc817 S |
751 | /* |
752 | * Signalling the host is conditional on many factors: | |
753 | * 1. The ring state changed from being empty to non-empty. | |
754 | * This is tracked by the variable "signal". | |
755 | * 2. The variable kick_q tracks if more data will be placed | |
756 | * on the ring. We will not signal if more data is | |
757 | * to be placed. | |
758 | * | |
759 | * If we cannot write to the ring-buffer; signal the host | |
760 | * even if we may not have written anything. This is a rare | |
761 | * enough condition that it should not matter. | |
762 | */ | |
763 | if (((ret == 0) && kick_q && signal) || (ret)) | |
fff41b2e | 764 | vmbus_setevent(channel); |
3e7ee490 | 765 | |
3e7ee490 HJ |
766 | return ret; |
767 | } | |
b3a19b36 | 768 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer_ctl); |
87e93d61 S |
769 | |
770 | /* | |
771 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer | |
772 | * packets using a GPADL Direct packet type. | |
773 | */ | |
774 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, | |
775 | struct hv_page_buffer pagebuffers[], | |
776 | u32 pagecount, void *buffer, u32 bufferlen, | |
777 | u64 requestid) | |
778 | { | |
779 | u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
780 | return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount, | |
781 | buffer, bufferlen, requestid, | |
782 | flags, true); | |
783 | ||
784 | } | |
713efeb4 | 785 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 786 | |
d61031ee S |
787 | /* |
788 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
789 | * using a GPADL Direct packet type. | |
790 | * The buffer includes the vmbus descriptor. | |
791 | */ | |
792 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
793 | struct vmbus_packet_mpb_array *desc, | |
794 | u32 desc_size, | |
795 | void *buffer, u32 bufferlen, u64 requestid) | |
796 | { | |
797 | int ret; | |
798 | u32 packetlen; | |
799 | u32 packetlen_aligned; | |
800 | struct kvec bufferlist[3]; | |
801 | u64 aligned_data = 0; | |
802 | bool signal = false; | |
803 | ||
804 | packetlen = desc_size + bufferlen; | |
805 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
806 | ||
807 | /* Setup the descriptor */ | |
808 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
809 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
810 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
811 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
812 | desc->transactionid = requestid; | |
813 | desc->rangecount = 1; | |
814 | ||
815 | bufferlist[0].iov_base = desc; | |
816 | bufferlist[0].iov_len = desc_size; | |
817 | bufferlist[1].iov_base = buffer; | |
818 | bufferlist[1].iov_len = bufferlen; | |
819 | bufferlist[2].iov_base = &aligned_data; | |
820 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
821 | ||
822 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); | |
823 | ||
824 | if (ret == 0 && signal) | |
825 | vmbus_setevent(channel); | |
826 | ||
827 | return ret; | |
828 | } | |
829 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
830 | ||
3e189519 | 831 | /* |
fff41b2e | 832 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 833 | * using a GPADL Direct packet type. |
f4266e34 | 834 | */ |
fff41b2e | 835 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
836 | struct hv_multipage_buffer *multi_pagebuffer, |
837 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 838 | { |
f4266e34 | 839 | int ret; |
430a8e9a | 840 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
841 | u32 descsize; |
842 | u32 packetlen; | |
843 | u32 packetlen_aligned; | |
011a7c3c | 844 | struct kvec bufferlist[3]; |
39d70a4a | 845 | u64 aligned_data = 0; |
98fa8cf4 | 846 | bool signal = false; |
ca623ad3 HZ |
847 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
848 | multi_pagebuffer->len); | |
3e7ee490 | 849 | |
24b8a406 | 850 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 851 | return -EINVAL; |
3e7ee490 | 852 | |
f4266e34 | 853 | /* |
430a8e9a | 854 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
855 | * the largest size we support |
856 | */ | |
39d70a4a HZ |
857 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
858 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 859 | sizeof(u64)); |
39d70a4a | 860 | packetlen = descsize + bufferlen; |
73509681 | 861 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 862 | |
3e7ee490 | 863 | |
454f18a9 | 864 | /* Setup the descriptor */ |
415f2287 | 865 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 866 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
867 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
868 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
869 | desc.transactionid = requestid; | |
430a8e9a | 870 | desc.rangecount = 1; |
3e7ee490 | 871 | |
ca623ad3 HZ |
872 | desc.range.len = multi_pagebuffer->len; |
873 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 874 | |
ca623ad3 | 875 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 876 | pfncount * sizeof(u64)); |
3e7ee490 | 877 | |
011a7c3c S |
878 | bufferlist[0].iov_base = &desc; |
879 | bufferlist[0].iov_len = descsize; | |
880 | bufferlist[1].iov_base = buffer; | |
881 | bufferlist[1].iov_len = bufferlen; | |
882 | bufferlist[2].iov_base = &aligned_data; | |
883 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 884 | |
98fa8cf4 | 885 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 886 | |
98fa8cf4 | 887 | if (ret == 0 && signal) |
fff41b2e | 888 | vmbus_setevent(channel); |
3e7ee490 | 889 | |
3e7ee490 HJ |
890 | return ret; |
891 | } | |
4cb106fa | 892 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
893 | |
894 | /** | |
fff41b2e | 895 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
896 | * @channel: Pointer to vmbus_channel structure. |
897 | * @buffer: Pointer to the buffer you want to receive the data into. | |
898 | * @bufferlen: Maximum size of what the the buffer will hold | |
899 | * @buffer_actual_len: The actual size of the data after it was received | |
900 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
901 | * |
902 | * Receives directly from the hyper-v vmbus and puts the data it received | |
903 | * into Buffer. This will receive the data unparsed from hyper-v. | |
904 | * | |
905 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 906 | */ |
fff41b2e | 907 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 908 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 909 | { |
8dc0a06a | 910 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
911 | u32 packetlen; |
912 | u32 userlen; | |
3e7ee490 | 913 | int ret; |
c2b8e520 | 914 | bool signal = false; |
3e7ee490 | 915 | |
39d70a4a HZ |
916 | *buffer_actual_len = 0; |
917 | *requestid = 0; | |
3e7ee490 | 918 | |
3e7ee490 | 919 | |
a89186c2 | 920 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 921 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 922 | if (ret != 0) |
3e7ee490 | 923 | return 0; |
3e7ee490 | 924 | |
415f2287 HZ |
925 | packetlen = desc.len8 << 3; |
926 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 927 | |
39d70a4a | 928 | *buffer_actual_len = userlen; |
3e7ee490 | 929 | |
39d70a4a | 930 | if (userlen > bufferlen) { |
3e7ee490 | 931 | |
0a46618d | 932 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 933 | bufferlen, userlen); |
926ae526 | 934 | return -ETOOSMALL; |
3e7ee490 HJ |
935 | } |
936 | ||
415f2287 | 937 | *requestid = desc.trans_id; |
3e7ee490 | 938 | |
454f18a9 | 939 | /* Copy over the packet to the user buffer */ |
38397c8a | 940 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 941 | (desc.offset8 << 3), &signal); |
3e7ee490 | 942 | |
c2b8e520 S |
943 | if (signal) |
944 | vmbus_setevent(channel); | |
3e7ee490 | 945 | |
3e7ee490 HJ |
946 | return 0; |
947 | } | |
fff41b2e | 948 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 949 | |
3e189519 | 950 | /* |
fff41b2e | 951 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 952 | */ |
fff41b2e | 953 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
954 | u32 bufferlen, u32 *buffer_actual_len, |
955 | u64 *requestid) | |
3e7ee490 | 956 | { |
8dc0a06a | 957 | struct vmpacket_descriptor desc; |
39d70a4a | 958 | u32 packetlen; |
3e7ee490 | 959 | int ret; |
c2b8e520 | 960 | bool signal = false; |
3e7ee490 | 961 | |
39d70a4a HZ |
962 | *buffer_actual_len = 0; |
963 | *requestid = 0; | |
3e7ee490 | 964 | |
3e7ee490 | 965 | |
a89186c2 | 966 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 967 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 968 | if (ret != 0) |
3e7ee490 | 969 | return 0; |
3e7ee490 | 970 | |
3e7ee490 | 971 | |
415f2287 | 972 | packetlen = desc.len8 << 3; |
3e7ee490 | 973 | |
39d70a4a | 974 | *buffer_actual_len = packetlen; |
3e7ee490 | 975 | |
7a446d63 | 976 | if (packetlen > bufferlen) |
3d5cad97 | 977 | return -ENOBUFS; |
3e7ee490 | 978 | |
415f2287 | 979 | *requestid = desc.trans_id; |
3e7ee490 | 980 | |
454f18a9 | 981 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
982 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
983 | &signal); | |
984 | ||
985 | if (signal) | |
986 | vmbus_setevent(channel); | |
3e7ee490 | 987 | |
33b06938 | 988 | return ret; |
3e7ee490 | 989 | } |
adaee6bd | 990 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |