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Commit | Line | Data |
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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 | */ |
1f6ee4e7 | 42 | void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 43 | { |
39d70a4a | 44 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 45 | |
3724287c S |
46 | /* |
47 | * For channels marked as in "low latency" mode | |
48 | * bypass the monitor page mechanism. | |
49 | */ | |
50 | if ((channel->offermsg.monitor_allocated) && | |
51 | (!channel->low_latency)) { | |
454f18a9 | 52 | /* Each u32 represents 32 channels */ |
22356585 | 53 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 54 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 55 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 56 | |
8681db44 GKH |
57 | /* Get the child to parent monitor page */ |
58 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 59 | |
22356585 | 60 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
61 | (unsigned long *)&monitorpage->trigger_group |
62 | [channel->monitor_grp].pending); | |
7c369f40 | 63 | |
f4266e34 | 64 | } else { |
21c3bef5 | 65 | vmbus_set_event(channel); |
3e7ee490 | 66 | } |
3e7ee490 | 67 | } |
1f6ee4e7 | 68 | EXPORT_SYMBOL_GPL(vmbus_setevent); |
3e7ee490 | 69 | |
3e189519 | 70 | /* |
fff41b2e | 71 | * vmbus_open - Open the specified channel. |
f4266e34 | 72 | */ |
fff41b2e | 73 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
74 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
75 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 76 | { |
0987ff69 | 77 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 78 | struct vmbus_channel_msginfo *open_info = NULL; |
dd0813b6 | 79 | unsigned long flags; |
08a9513f | 80 | int ret, err = 0; |
294409d2 | 81 | struct page *page; |
3e7ee490 | 82 | |
98f531b1 VK |
83 | if (send_ringbuffer_size % PAGE_SIZE || |
84 | recv_ringbuffer_size % PAGE_SIZE) | |
85 | return -EINVAL; | |
86 | ||
67fae053 | 87 | spin_lock_irqsave(&newchannel->lock, flags); |
e68d2971 S |
88 | if (newchannel->state == CHANNEL_OPEN_STATE) { |
89 | newchannel->state = CHANNEL_OPENING_STATE; | |
90 | } else { | |
67fae053 | 91 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 S |
92 | return -EINVAL; |
93 | } | |
67fae053 | 94 | spin_unlock_irqrestore(&newchannel->lock, flags); |
e68d2971 | 95 | |
c50f7fb2 HZ |
96 | newchannel->onchannel_callback = onchannelcallback; |
97 | newchannel->channel_callback_context = context; | |
3e7ee490 | 98 | |
454f18a9 | 99 | /* Allocate the ring buffer */ |
294409d2 S |
100 | page = alloc_pages_node(cpu_to_node(newchannel->target_cpu), |
101 | GFP_KERNEL|__GFP_ZERO, | |
102 | get_order(send_ringbuffer_size + | |
103 | recv_ringbuffer_size)); | |
104 | ||
105 | if (!page) | |
98f531b1 VK |
106 | page = alloc_pages(GFP_KERNEL|__GFP_ZERO, |
107 | get_order(send_ringbuffer_size + | |
108 | recv_ringbuffer_size)); | |
df3493e0 | 109 | |
98f531b1 | 110 | if (!page) { |
ac0d12b7 | 111 | err = -ENOMEM; |
98f531b1 | 112 | goto error_set_chnstate; |
ac0d12b7 | 113 | } |
3e7ee490 | 114 | |
9988ce68 | 115 | newchannel->ringbuffer_pages = page_address(page); |
c50f7fb2 | 116 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + |
39d70a4a | 117 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 118 | |
9988ce68 VK |
119 | ret = hv_ringbuffer_init(&newchannel->outbound, page, |
120 | send_ringbuffer_size >> PAGE_SHIFT); | |
72a95cbc | 121 | |
fd4dc88e | 122 | if (ret != 0) { |
3324fb40 | 123 | err = ret; |
98f531b1 | 124 | goto error_free_pages; |
3324fb40 BP |
125 | } |
126 | ||
9988ce68 VK |
127 | ret = hv_ringbuffer_init(&newchannel->inbound, |
128 | &page[send_ringbuffer_size >> PAGE_SHIFT], | |
129 | recv_ringbuffer_size >> PAGE_SHIFT); | |
fd4dc88e | 130 | if (ret != 0) { |
3324fb40 | 131 | err = ret; |
98f531b1 | 132 | goto error_free_pages; |
3324fb40 | 133 | } |
3e7ee490 | 134 | |
3e7ee490 | 135 | |
454f18a9 | 136 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 137 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 138 | |
fff41b2e | 139 | ret = vmbus_establish_gpadl(newchannel, |
9988ce68 VK |
140 | page_address(page), |
141 | send_ringbuffer_size + | |
142 | recv_ringbuffer_size, | |
143 | &newchannel->ringbuffer_gpadlhandle); | |
b94ef345 | 144 | |
fd4dc88e | 145 | if (ret != 0) { |
b94ef345 | 146 | err = ret; |
98f531b1 | 147 | goto error_free_pages; |
b94ef345 | 148 | } |
f4266e34 | 149 | |
454f18a9 | 150 | /* Create and init the channel open message */ |
176fb9e3 | 151 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
152 | sizeof(struct vmbus_channel_open_channel), |
153 | GFP_KERNEL); | |
176fb9e3 | 154 | if (!open_info) { |
c3bf2e26 | 155 | err = -ENOMEM; |
98f531b1 | 156 | goto error_free_gpadl; |
c3bf2e26 | 157 | } |
3e7ee490 | 158 | |
176fb9e3 | 159 | init_completion(&open_info->waitevent); |
3e7ee490 | 160 | |
176fb9e3 | 161 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
162 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
163 | open_msg->openid = newchannel->offermsg.child_relid; | |
164 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
165 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
166 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 167 | PAGE_SHIFT; |
abbf3b2a | 168 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 169 | |
39d70a4a | 170 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 171 | err = -EINVAL; |
98f531b1 | 172 | goto error_free_gpadl; |
c827f944 BP |
173 | } |
174 | ||
39d70a4a | 175 | if (userdatalen) |
0987ff69 | 176 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 177 | |
15b2f647 | 178 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 179 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 180 | &vmbus_connection.chn_msg_list); |
15b2f647 | 181 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 182 | |
0987ff69 | 183 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 184 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 | 185 | |
45d727ce S |
186 | if (ret != 0) { |
187 | err = ret; | |
98f531b1 | 188 | goto error_clean_msglist; |
45d727ce | 189 | } |
3e7ee490 | 190 | |
396e287f | 191 | wait_for_completion(&open_info->waitevent); |
0c3b7b2f | 192 | |
15b2f647 | 193 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 194 | list_del(&open_info->msglistentry); |
15b2f647 | 195 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 196 | |
ffc151f3 VK |
197 | if (open_info->response.open_result.status) { |
198 | err = -EAGAIN; | |
98f531b1 | 199 | goto error_free_gpadl; |
ffc151f3 | 200 | } |
e68d2971 | 201 | |
ffc151f3 | 202 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 203 | kfree(open_info); |
ffc151f3 | 204 | return 0; |
c3bf2e26 | 205 | |
98f531b1 | 206 | error_clean_msglist: |
13925502 S |
207 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
208 | list_del(&open_info->msglistentry); | |
209 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
210 | ||
98f531b1 | 211 | error_free_gpadl: |
40384e4b | 212 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); |
98f531b1 VK |
213 | kfree(open_info); |
214 | error_free_pages: | |
9988ce68 VK |
215 | hv_ringbuffer_cleanup(&newchannel->outbound); |
216 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
217 | __free_pages(page, | |
218 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
98f531b1 | 219 | error_set_chnstate: |
ac0d12b7 | 220 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 221 | return err; |
3e7ee490 | 222 | } |
36ceadfc | 223 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 224 | |
5c23a1a5 DC |
225 | /* Used for Hyper-V Socket: a guest client's connect() to the host */ |
226 | int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id, | |
227 | const uuid_le *shv_host_servie_id) | |
228 | { | |
229 | struct vmbus_channel_tl_connect_request conn_msg; | |
230 | ||
231 | memset(&conn_msg, 0, sizeof(conn_msg)); | |
232 | conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST; | |
233 | conn_msg.guest_endpoint_id = *shv_guest_servie_id; | |
234 | conn_msg.host_service_id = *shv_host_servie_id; | |
235 | ||
236 | return vmbus_post_msg(&conn_msg, sizeof(conn_msg)); | |
237 | } | |
238 | EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request); | |
239 | ||
3e189519 | 240 | /* |
fff41b2e | 241 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 242 | */ |
fff41b2e | 243 | static int create_gpadl_header(void *kbuffer, u32 size, |
4d637632 | 244 | struct vmbus_channel_msginfo **msginfo) |
3e7ee490 HJ |
245 | { |
246 | int i; | |
39d70a4a | 247 | int pagecount; |
39d70a4a HZ |
248 | struct vmbus_channel_gpadl_header *gpadl_header; |
249 | struct vmbus_channel_gpadl_body *gpadl_body; | |
250 | struct vmbus_channel_msginfo *msgheader; | |
251 | struct vmbus_channel_msginfo *msgbody = NULL; | |
252 | u32 msgsize; | |
3e7ee490 | 253 | |
39d70a4a | 254 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 255 | |
39d70a4a | 256 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 257 | |
454f18a9 | 258 | /* do we need a gpadl body msg */ |
39d70a4a | 259 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
260 | sizeof(struct vmbus_channel_gpadl_header) - |
261 | sizeof(struct gpa_range); | |
39d70a4a | 262 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 263 | |
39d70a4a | 264 | if (pagecount > pfncount) { |
f4266e34 | 265 | /* we need a gpadl body */ |
454f18a9 | 266 | /* fill in the header */ |
39d70a4a | 267 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 268 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
269 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
270 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
271 | if (!msgheader) | |
d1c250bb | 272 | goto nomem; |
3e7ee490 | 273 | |
c50f7fb2 HZ |
274 | INIT_LIST_HEAD(&msgheader->submsglist); |
275 | msgheader->msgsize = msgsize; | |
3e7ee490 | 276 | |
39d70a4a | 277 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
278 | msgheader->msg; |
279 | gpadl_header->rangecount = 1; | |
280 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 281 | pagecount * sizeof(u64); |
415f2287 HZ |
282 | gpadl_header->range[0].byte_offset = 0; |
283 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 284 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
285 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
286 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a | 287 | *msginfo = msgheader; |
3e7ee490 | 288 | |
39d70a4a HZ |
289 | pfnsum = pfncount; |
290 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 291 | |
454f18a9 | 292 | /* how many pfns can we fit */ |
39d70a4a | 293 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 294 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 295 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 296 | |
454f18a9 | 297 | /* fill in the body */ |
39d70a4a HZ |
298 | while (pfnleft) { |
299 | if (pfnleft > pfncount) | |
300 | pfncurr = pfncount; | |
3e7ee490 | 301 | else |
39d70a4a | 302 | pfncurr = pfnleft; |
3e7ee490 | 303 | |
39d70a4a | 304 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 305 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
306 | pfncurr * sizeof(u64); |
307 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
308 | |
309 | if (!msgbody) { | |
310 | struct vmbus_channel_msginfo *pos = NULL; | |
311 | struct vmbus_channel_msginfo *tmp = NULL; | |
312 | /* | |
313 | * Free up all the allocated messages. | |
314 | */ | |
315 | list_for_each_entry_safe(pos, tmp, | |
316 | &msgheader->submsglist, | |
317 | msglistentry) { | |
318 | ||
319 | list_del(&pos->msglistentry); | |
320 | kfree(pos); | |
321 | } | |
322 | ||
d1c250bb | 323 | goto nomem; |
f38cf9cc S |
324 | } |
325 | ||
c50f7fb2 | 326 | msgbody->msgsize = msgsize; |
39d70a4a | 327 | gpadl_body = |
c50f7fb2 | 328 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
329 | |
330 | /* | |
f4266e34 GKH |
331 | * Gpadl is u32 and we are using a pointer which could |
332 | * be 64-bit | |
f27df643 S |
333 | * This is governed by the guest/host protocol and |
334 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 335 | */ |
39d70a4a | 336 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
337 | gpadl_body->pfn[i] = slow_virt_to_phys( |
338 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
339 | PAGE_SHIFT; | |
3e7ee490 | 340 | |
454f18a9 | 341 | /* add to msg header */ |
c50f7fb2 HZ |
342 | list_add_tail(&msgbody->msglistentry, |
343 | &msgheader->submsglist); | |
39d70a4a HZ |
344 | pfnsum += pfncurr; |
345 | pfnleft -= pfncurr; | |
3e7ee490 | 346 | } |
f4266e34 | 347 | } else { |
454f18a9 | 348 | /* everything fits in a header */ |
39d70a4a | 349 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 350 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
351 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
352 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
353 | if (msgheader == NULL) | |
e3eb7cdd | 354 | goto nomem; |
4d637632 VK |
355 | |
356 | INIT_LIST_HEAD(&msgheader->submsglist); | |
c50f7fb2 | 357 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
358 | |
359 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
360 | msgheader->msg; |
361 | gpadl_header->rangecount = 1; | |
362 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 363 | pagecount * sizeof(u64); |
415f2287 HZ |
364 | gpadl_header->range[0].byte_offset = 0; |
365 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 366 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
367 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
368 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
369 | |
370 | *msginfo = msgheader; | |
3e7ee490 HJ |
371 | } |
372 | ||
373 | return 0; | |
d1c250bb | 374 | nomem: |
39d70a4a HZ |
375 | kfree(msgheader); |
376 | kfree(msgbody); | |
d1c250bb | 377 | return -ENOMEM; |
3e7ee490 HJ |
378 | } |
379 | ||
3e189519 | 380 | /* |
fff41b2e | 381 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 382 | * |
39d70a4a | 383 | * @channel: a channel |
b679ef73 | 384 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
385 | * @size: page-size multiple |
386 | * @gpadl_handle: some funky thing | |
f4266e34 | 387 | */ |
fff41b2e | 388 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 389 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 390 | { |
39d70a4a HZ |
391 | struct vmbus_channel_gpadl_header *gpadlmsg; |
392 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a | 393 | struct vmbus_channel_msginfo *msginfo = NULL; |
7cc80c98 | 394 | struct vmbus_channel_msginfo *submsginfo, *tmp; |
53af545b | 395 | struct list_head *curr; |
39d70a4a | 396 | u32 next_gpadl_handle; |
dd0813b6 | 397 | unsigned long flags; |
c3bf2e26 | 398 | int ret = 0; |
3e7ee490 | 399 | |
9f52a163 S |
400 | next_gpadl_handle = |
401 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 402 | |
4d637632 | 403 | ret = create_gpadl_header(kbuffer, size, &msginfo); |
c3bf2e26 BP |
404 | if (ret) |
405 | return ret; | |
3e7ee490 | 406 | |
9568a193 | 407 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 408 | |
c50f7fb2 HZ |
409 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
410 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
411 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
412 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 413 | |
3e7ee490 | 414 | |
15b2f647 | 415 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 416 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 417 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 418 | |
15b2f647 | 419 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 420 | |
c6977677 | 421 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 422 | sizeof(*msginfo)); |
98e08702 | 423 | if (ret != 0) |
00d760b0 | 424 | goto cleanup; |
3e7ee490 | 425 | |
4d637632 VK |
426 | list_for_each(curr, &msginfo->submsglist) { |
427 | submsginfo = (struct vmbus_channel_msginfo *)curr; | |
428 | gpadl_body = | |
429 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; | |
53af545b | 430 | |
4d637632 VK |
431 | gpadl_body->header.msgtype = |
432 | CHANNELMSG_GPADL_BODY; | |
433 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 434 | |
4d637632 VK |
435 | ret = vmbus_post_msg(gpadl_body, |
436 | submsginfo->msgsize - | |
437 | sizeof(*submsginfo)); | |
438 | if (ret != 0) | |
439 | goto cleanup; | |
3e7ee490 | 440 | |
3e7ee490 | 441 | } |
72c6b71c | 442 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 443 | |
454f18a9 | 444 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 445 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 446 | |
00d760b0 | 447 | cleanup: |
15b2f647 | 448 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 449 | list_del(&msginfo->msglistentry); |
15b2f647 | 450 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
7cc80c98 VK |
451 | list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist, |
452 | msglistentry) { | |
453 | kfree(submsginfo); | |
454 | } | |
3e7ee490 | 455 | |
39d70a4a | 456 | kfree(msginfo); |
3e7ee490 HJ |
457 | return ret; |
458 | } | |
98873724 | 459 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 460 | |
3e189519 | 461 | /* |
fff41b2e | 462 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 463 | */ |
fff41b2e | 464 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 465 | { |
82250213 | 466 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 467 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 468 | unsigned long flags; |
66be6530 | 469 | int ret; |
3e7ee490 | 470 | |
f4266e34 GKH |
471 | info = kmalloc(sizeof(*info) + |
472 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
473 | if (!info) |
474 | return -ENOMEM; | |
3e7ee490 | 475 | |
9568a193 | 476 | init_completion(&info->waitevent); |
3e7ee490 | 477 | |
c50f7fb2 | 478 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 479 | |
c50f7fb2 HZ |
480 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
481 | msg->child_relid = channel->offermsg.child_relid; | |
482 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 483 | |
15b2f647 | 484 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 485 | list_add_tail(&info->msglistentry, |
da9fcb72 | 486 | &vmbus_connection.chn_msg_list); |
15b2f647 | 487 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 488 | ret = vmbus_post_msg(msg, |
f4266e34 | 489 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 490 | |
66be6530 S |
491 | if (ret) |
492 | goto post_msg_err; | |
493 | ||
494 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 495 | |
66be6530 | 496 | post_msg_err: |
15b2f647 | 497 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 498 | list_del(&info->msglistentry); |
15b2f647 | 499 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 500 | |
8c69f52a | 501 | kfree(info); |
3e7ee490 HJ |
502 | return ret; |
503 | } | |
18726d7a | 504 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 505 | |
d3ba720d S |
506 | static void reset_channel_cb(void *arg) |
507 | { | |
508 | struct vmbus_channel *channel = arg; | |
509 | ||
510 | channel->onchannel_callback = NULL; | |
511 | } | |
512 | ||
98d731bb | 513 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 514 | { |
82250213 | 515 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 516 | int ret; |
3e7ee490 | 517 | |
63d55b2a DC |
518 | /* |
519 | * process_chn_event(), running in the tasklet, can race | |
520 | * with vmbus_close_internal() in the case of SMP guest, e.g., when | |
521 | * the former is accessing channel->inbound.ring_buffer, the latter | |
522 | * could be freeing the ring_buffer pages. | |
523 | * | |
524 | * To resolve the race, we can serialize them by disabling the | |
525 | * tasklet when the latter is running here. | |
526 | */ | |
638fea33 | 527 | hv_event_tasklet_disable(channel); |
63d55b2a | 528 | |
64b7faf9 DC |
529 | /* |
530 | * In case a device driver's probe() fails (e.g., | |
531 | * util_probe() -> vmbus_open() returns -ENOMEM) and the device is | |
532 | * rescinded later (e.g., we dynamically disble an Integrated Service | |
533 | * in Hyper-V Manager), the driver's remove() invokes vmbus_close(): | |
534 | * here we should skip most of the below cleanup work. | |
535 | */ | |
536 | if (channel->state != CHANNEL_OPENED_STATE) { | |
537 | ret = -EINVAL; | |
538 | goto out; | |
539 | } | |
540 | ||
e68d2971 S |
541 | channel->state = CHANNEL_OPEN_STATE; |
542 | channel->sc_creation_callback = NULL; | |
454f18a9 | 543 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
544 | if (channel->target_cpu != get_cpu()) { |
545 | put_cpu(); | |
d3ba720d S |
546 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
547 | channel, true); | |
2115b561 | 548 | } else { |
d3ba720d | 549 | reset_channel_cb(channel); |
2115b561 S |
550 | put_cpu(); |
551 | } | |
3e7ee490 | 552 | |
454f18a9 | 553 | /* Send a closing message */ |
3e7ee490 | 554 | |
e9a27a9f | 555 | msg = &channel->close_msg.msg; |
3e7ee490 | 556 | |
c50f7fb2 HZ |
557 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
558 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 559 | |
c6977677 | 560 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 561 | |
98d731bb S |
562 | if (ret) { |
563 | pr_err("Close failed: close post msg return is %d\n", ret); | |
564 | /* | |
565 | * If we failed to post the close msg, | |
566 | * it is perhaps better to leak memory. | |
567 | */ | |
63d55b2a | 568 | goto out; |
98d731bb S |
569 | } |
570 | ||
454f18a9 | 571 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
572 | if (channel->ringbuffer_gpadlhandle) { |
573 | ret = vmbus_teardown_gpadl(channel, | |
574 | channel->ringbuffer_gpadlhandle); | |
575 | if (ret) { | |
576 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
577 | /* | |
578 | * If we failed to teardown gpadl, | |
579 | * it is perhaps better to leak memory. | |
580 | */ | |
63d55b2a | 581 | goto out; |
98d731bb S |
582 | } |
583 | } | |
3e7ee490 | 584 | |
454f18a9 | 585 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
586 | hv_ringbuffer_cleanup(&channel->outbound); |
587 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 588 | |
df3493e0 S |
589 | free_pages((unsigned long)channel->ringbuffer_pages, |
590 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 591 | |
63d55b2a | 592 | out: |
638fea33 | 593 | hv_event_tasklet_enable(channel); |
63d55b2a | 594 | |
98d731bb | 595 | return ret; |
3e7ee490 | 596 | } |
e68d2971 S |
597 | |
598 | /* | |
599 | * vmbus_close - Close the specified channel | |
600 | */ | |
601 | void vmbus_close(struct vmbus_channel *channel) | |
602 | { | |
603 | struct list_head *cur, *tmp; | |
604 | struct vmbus_channel *cur_channel; | |
605 | ||
606 | if (channel->primary_channel != NULL) { | |
607 | /* | |
608 | * We will only close sub-channels when | |
609 | * the primary is closed. | |
610 | */ | |
611 | return; | |
612 | } | |
613 | /* | |
614 | * Close all the sub-channels first and then close the | |
615 | * primary channel. | |
616 | */ | |
617 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
618 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
619 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
620 | continue; | |
621 | vmbus_close_internal(cur_channel); | |
622 | } | |
623 | /* | |
624 | * Now close the primary. | |
625 | */ | |
626 | vmbus_close_internal(channel); | |
627 | } | |
70bfa307 | 628 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 629 | |
e9395e3f | 630 | int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 631 | u32 bufferlen, u64 requestid, |
e9395e3f | 632 | enum vmbus_packet_type type, u32 flags, bool kick_q) |
3e7ee490 | 633 | { |
8dc0a06a | 634 | struct vmpacket_descriptor desc; |
39d70a4a | 635 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 636 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 637 | struct kvec bufferlist[3]; |
39d70a4a | 638 | u64 aligned_data = 0; |
fe760e4d | 639 | bool lock = channel->acquire_ring_lock; |
b81658cf | 640 | int num_vecs = ((bufferlen != 0) ? 3 : 1); |
3e7ee490 | 641 | |
3e7ee490 | 642 | |
454f18a9 | 643 | /* Setup the descriptor */ |
415f2287 HZ |
644 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
645 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 646 | /* in 8-bytes granularity */ |
415f2287 HZ |
647 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
648 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
649 | desc.trans_id = requestid; | |
3e7ee490 | 650 | |
011a7c3c S |
651 | bufferlist[0].iov_base = &desc; |
652 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
653 | bufferlist[1].iov_base = buffer; | |
654 | bufferlist[1].iov_len = bufferlen; | |
655 | bufferlist[2].iov_base = &aligned_data; | |
656 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 657 | |
1f6ee4e7 S |
658 | return hv_ringbuffer_write(channel, bufferlist, num_vecs, |
659 | lock, kick_q); | |
3e7ee490 | 660 | |
3e7ee490 | 661 | } |
e9395e3f S |
662 | EXPORT_SYMBOL(vmbus_sendpacket_ctl); |
663 | ||
664 | /** | |
665 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
666 | * @channel: Pointer to vmbus_channel structure. | |
667 | * @buffer: Pointer to the buffer you want to receive the data into. | |
668 | * @bufferlen: Maximum size of what the the buffer will hold | |
669 | * @requestid: Identifier of the request | |
670 | * @type: Type of packet that is being send e.g. negotiate, time | |
671 | * packet etc. | |
672 | * | |
673 | * Sends data in @buffer directly to hyper-v via the vmbus | |
674 | * This will send the data unparsed to hyper-v. | |
675 | * | |
676 | * Mainly used by Hyper-V drivers. | |
677 | */ | |
678 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
679 | u32 bufferlen, u64 requestid, | |
680 | enum vmbus_packet_type type, u32 flags) | |
681 | { | |
682 | return vmbus_sendpacket_ctl(channel, buffer, bufferlen, requestid, | |
683 | type, flags, true); | |
684 | } | |
fff41b2e | 685 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 686 | |
3e189519 | 687 | /* |
87e93d61 S |
688 | * vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer |
689 | * packets using a GPADL Direct packet type. This interface allows you | |
690 | * to control notifying the host. This will be useful for sending | |
691 | * batched data. Also the sender can control the send flags | |
692 | * explicitly. | |
f4266e34 | 693 | */ |
87e93d61 | 694 | int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel, |
39d70a4a HZ |
695 | struct hv_page_buffer pagebuffers[], |
696 | u32 pagecount, void *buffer, u32 bufferlen, | |
87e93d61 S |
697 | u64 requestid, |
698 | u32 flags, | |
699 | bool kick_q) | |
3e7ee490 | 700 | { |
f4266e34 | 701 | int i; |
430a8e9a | 702 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
703 | u32 descsize; |
704 | u32 packetlen; | |
705 | u32 packetlen_aligned; | |
011a7c3c | 706 | struct kvec bufferlist[3]; |
39d70a4a | 707 | u64 aligned_data = 0; |
fe760e4d | 708 | bool lock = channel->acquire_ring_lock; |
3e7ee490 | 709 | |
39d70a4a | 710 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 711 | return -EINVAL; |
3e7ee490 | 712 | |
3e7ee490 | 713 | |
f4266e34 | 714 | /* |
430a8e9a | 715 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
716 | * largest size we support |
717 | */ | |
39d70a4a HZ |
718 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
719 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 720 | sizeof(struct hv_page_buffer)); |
39d70a4a | 721 | packetlen = descsize + bufferlen; |
73509681 | 722 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 723 | |
454f18a9 | 724 | /* Setup the descriptor */ |
415f2287 | 725 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
87e93d61 | 726 | desc.flags = flags; |
39d70a4a HZ |
727 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
728 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
729 | desc.transactionid = requestid; | |
730 | desc.rangecount = pagecount; | |
731 | ||
732 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
733 | desc.range[i].len = pagebuffers[i].len; |
734 | desc.range[i].offset = pagebuffers[i].offset; | |
735 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
736 | } |
737 | ||
011a7c3c S |
738 | bufferlist[0].iov_base = &desc; |
739 | bufferlist[0].iov_len = descsize; | |
740 | bufferlist[1].iov_base = buffer; | |
741 | bufferlist[1].iov_len = bufferlen; | |
742 | bufferlist[2].iov_base = &aligned_data; | |
743 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 744 | |
1f6ee4e7 S |
745 | return hv_ringbuffer_write(channel, bufferlist, 3, |
746 | lock, kick_q); | |
3e7ee490 | 747 | } |
b3a19b36 | 748 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer_ctl); |
87e93d61 S |
749 | |
750 | /* | |
751 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer | |
752 | * packets using a GPADL Direct packet type. | |
753 | */ | |
754 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, | |
755 | struct hv_page_buffer pagebuffers[], | |
756 | u32 pagecount, void *buffer, u32 bufferlen, | |
757 | u64 requestid) | |
758 | { | |
759 | u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
760 | return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount, | |
761 | buffer, bufferlen, requestid, | |
762 | flags, true); | |
763 | ||
764 | } | |
713efeb4 | 765 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 766 | |
d61031ee S |
767 | /* |
768 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
769 | * using a GPADL Direct packet type. | |
770 | * The buffer includes the vmbus descriptor. | |
771 | */ | |
772 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
773 | struct vmbus_packet_mpb_array *desc, | |
774 | u32 desc_size, | |
775 | void *buffer, u32 bufferlen, u64 requestid) | |
776 | { | |
d61031ee S |
777 | u32 packetlen; |
778 | u32 packetlen_aligned; | |
779 | struct kvec bufferlist[3]; | |
780 | u64 aligned_data = 0; | |
fe760e4d | 781 | bool lock = channel->acquire_ring_lock; |
d61031ee S |
782 | |
783 | packetlen = desc_size + bufferlen; | |
784 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
785 | ||
786 | /* Setup the descriptor */ | |
787 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
788 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
789 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
790 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
791 | desc->transactionid = requestid; | |
792 | desc->rangecount = 1; | |
793 | ||
794 | bufferlist[0].iov_base = desc; | |
795 | bufferlist[0].iov_len = desc_size; | |
796 | bufferlist[1].iov_base = buffer; | |
797 | bufferlist[1].iov_len = bufferlen; | |
798 | bufferlist[2].iov_base = &aligned_data; | |
799 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
800 | ||
1f6ee4e7 S |
801 | return hv_ringbuffer_write(channel, bufferlist, 3, |
802 | lock, true); | |
d61031ee S |
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 | { |
430a8e9a | 814 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
815 | u32 descsize; |
816 | u32 packetlen; | |
817 | u32 packetlen_aligned; | |
011a7c3c | 818 | struct kvec bufferlist[3]; |
39d70a4a | 819 | u64 aligned_data = 0; |
fe760e4d | 820 | bool lock = channel->acquire_ring_lock; |
ca623ad3 HZ |
821 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
822 | multi_pagebuffer->len); | |
3e7ee490 | 823 | |
24b8a406 | 824 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 825 | return -EINVAL; |
3e7ee490 | 826 | |
f4266e34 | 827 | /* |
430a8e9a | 828 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
829 | * the largest size we support |
830 | */ | |
39d70a4a HZ |
831 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
832 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 833 | sizeof(u64)); |
39d70a4a | 834 | packetlen = descsize + bufferlen; |
73509681 | 835 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 836 | |
3e7ee490 | 837 | |
454f18a9 | 838 | /* Setup the descriptor */ |
415f2287 | 839 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 840 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
841 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
842 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
843 | desc.transactionid = requestid; | |
430a8e9a | 844 | desc.rangecount = 1; |
3e7ee490 | 845 | |
ca623ad3 HZ |
846 | desc.range.len = multi_pagebuffer->len; |
847 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 848 | |
ca623ad3 | 849 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 850 | pfncount * sizeof(u64)); |
3e7ee490 | 851 | |
011a7c3c S |
852 | bufferlist[0].iov_base = &desc; |
853 | bufferlist[0].iov_len = descsize; | |
854 | bufferlist[1].iov_base = buffer; | |
855 | bufferlist[1].iov_len = bufferlen; | |
856 | bufferlist[2].iov_base = &aligned_data; | |
857 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 858 | |
1f6ee4e7 S |
859 | return hv_ringbuffer_write(channel, bufferlist, 3, |
860 | lock, true); | |
3e7ee490 | 861 | } |
4cb106fa | 862 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
863 | |
864 | /** | |
fff41b2e | 865 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
866 | * @channel: Pointer to vmbus_channel structure. |
867 | * @buffer: Pointer to the buffer you want to receive the data into. | |
868 | * @bufferlen: Maximum size of what the the buffer will hold | |
869 | * @buffer_actual_len: The actual size of the data after it was received | |
870 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
871 | * |
872 | * Receives directly from the hyper-v vmbus and puts the data it received | |
873 | * into Buffer. This will receive the data unparsed from hyper-v. | |
874 | * | |
875 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 876 | */ |
667d3740 VK |
877 | static inline int |
878 | __vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
879 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid, | |
880 | bool raw) | |
3e7ee490 | 881 | { |
3372592a S |
882 | return hv_ringbuffer_read(channel, buffer, bufferlen, |
883 | buffer_actual_len, requestid, raw); | |
3e7ee490 | 884 | |
667d3740 VK |
885 | } |
886 | ||
887 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
888 | u32 bufferlen, u32 *buffer_actual_len, | |
889 | u64 *requestid) | |
890 | { | |
891 | return __vmbus_recvpacket(channel, buffer, bufferlen, | |
892 | buffer_actual_len, requestid, false); | |
3e7ee490 | 893 | } |
fff41b2e | 894 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 895 | |
3e189519 | 896 | /* |
fff41b2e | 897 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 898 | */ |
fff41b2e | 899 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
900 | u32 bufferlen, u32 *buffer_actual_len, |
901 | u64 *requestid) | |
3e7ee490 | 902 | { |
667d3740 VK |
903 | return __vmbus_recvpacket(channel, buffer, bufferlen, |
904 | buffer_actual_len, requestid, true); | |
3e7ee490 | 905 | } |
adaee6bd | 906 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |