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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 | */ |
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 | 75 | int ret, err = 0; |
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 | |
396e287f | 185 | wait_for_completion(&open_info->waitevent); |
0c3b7b2f | 186 | |
15b2f647 | 187 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 188 | list_del(&open_info->msglistentry); |
15b2f647 | 189 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 190 | |
ffc151f3 VK |
191 | if (open_info->response.open_result.status) { |
192 | err = -EAGAIN; | |
193 | goto error_gpadl; | |
194 | } | |
e68d2971 | 195 | |
ffc151f3 | 196 | newchannel->state = CHANNEL_OPENED_STATE; |
176fb9e3 | 197 | kfree(open_info); |
ffc151f3 | 198 | return 0; |
c3bf2e26 | 199 | |
13925502 S |
200 | error1: |
201 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
202 | list_del(&open_info->msglistentry); | |
203 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
204 | ||
40384e4b S |
205 | error_gpadl: |
206 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); | |
207 | ||
13925502 | 208 | error0: |
df3493e0 S |
209 | free_pages((unsigned long)out, |
210 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 211 | kfree(open_info); |
ac0d12b7 | 212 | newchannel->state = CHANNEL_OPEN_STATE; |
c3bf2e26 | 213 | return err; |
3e7ee490 | 214 | } |
36ceadfc | 215 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 216 | |
5c23a1a5 DC |
217 | /* Used for Hyper-V Socket: a guest client's connect() to the host */ |
218 | int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id, | |
219 | const uuid_le *shv_host_servie_id) | |
220 | { | |
221 | struct vmbus_channel_tl_connect_request conn_msg; | |
222 | ||
223 | memset(&conn_msg, 0, sizeof(conn_msg)); | |
224 | conn_msg.header.msgtype = CHANNELMSG_TL_CONNECT_REQUEST; | |
225 | conn_msg.guest_endpoint_id = *shv_guest_servie_id; | |
226 | conn_msg.host_service_id = *shv_host_servie_id; | |
227 | ||
228 | return vmbus_post_msg(&conn_msg, sizeof(conn_msg)); | |
229 | } | |
230 | EXPORT_SYMBOL_GPL(vmbus_send_tl_connect_request); | |
231 | ||
3e189519 | 232 | /* |
fff41b2e | 233 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 234 | */ |
fff41b2e | 235 | static int create_gpadl_header(void *kbuffer, u32 size, |
4d637632 | 236 | struct vmbus_channel_msginfo **msginfo) |
3e7ee490 HJ |
237 | { |
238 | int i; | |
39d70a4a | 239 | int pagecount; |
39d70a4a HZ |
240 | struct vmbus_channel_gpadl_header *gpadl_header; |
241 | struct vmbus_channel_gpadl_body *gpadl_body; | |
242 | struct vmbus_channel_msginfo *msgheader; | |
243 | struct vmbus_channel_msginfo *msgbody = NULL; | |
244 | u32 msgsize; | |
3e7ee490 | 245 | |
39d70a4a | 246 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 247 | |
39d70a4a | 248 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 249 | |
454f18a9 | 250 | /* do we need a gpadl body msg */ |
39d70a4a | 251 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
252 | sizeof(struct vmbus_channel_gpadl_header) - |
253 | sizeof(struct gpa_range); | |
39d70a4a | 254 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 255 | |
39d70a4a | 256 | if (pagecount > pfncount) { |
f4266e34 | 257 | /* we need a gpadl body */ |
454f18a9 | 258 | /* fill in the header */ |
39d70a4a | 259 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 260 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
261 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
262 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
263 | if (!msgheader) | |
d1c250bb | 264 | goto nomem; |
3e7ee490 | 265 | |
c50f7fb2 HZ |
266 | INIT_LIST_HEAD(&msgheader->submsglist); |
267 | msgheader->msgsize = msgsize; | |
3e7ee490 | 268 | |
39d70a4a | 269 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
270 | msgheader->msg; |
271 | gpadl_header->rangecount = 1; | |
272 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 273 | pagecount * sizeof(u64); |
415f2287 HZ |
274 | gpadl_header->range[0].byte_offset = 0; |
275 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 276 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
277 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
278 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a | 279 | *msginfo = msgheader; |
3e7ee490 | 280 | |
39d70a4a HZ |
281 | pfnsum = pfncount; |
282 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 283 | |
454f18a9 | 284 | /* how many pfns can we fit */ |
39d70a4a | 285 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 286 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 287 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 288 | |
454f18a9 | 289 | /* fill in the body */ |
39d70a4a HZ |
290 | while (pfnleft) { |
291 | if (pfnleft > pfncount) | |
292 | pfncurr = pfncount; | |
3e7ee490 | 293 | else |
39d70a4a | 294 | pfncurr = pfnleft; |
3e7ee490 | 295 | |
39d70a4a | 296 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 297 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
298 | pfncurr * sizeof(u64); |
299 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
300 | |
301 | if (!msgbody) { | |
302 | struct vmbus_channel_msginfo *pos = NULL; | |
303 | struct vmbus_channel_msginfo *tmp = NULL; | |
304 | /* | |
305 | * Free up all the allocated messages. | |
306 | */ | |
307 | list_for_each_entry_safe(pos, tmp, | |
308 | &msgheader->submsglist, | |
309 | msglistentry) { | |
310 | ||
311 | list_del(&pos->msglistentry); | |
312 | kfree(pos); | |
313 | } | |
314 | ||
d1c250bb | 315 | goto nomem; |
f38cf9cc S |
316 | } |
317 | ||
c50f7fb2 | 318 | msgbody->msgsize = msgsize; |
39d70a4a | 319 | gpadl_body = |
c50f7fb2 | 320 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
321 | |
322 | /* | |
f4266e34 GKH |
323 | * Gpadl is u32 and we are using a pointer which could |
324 | * be 64-bit | |
f27df643 S |
325 | * This is governed by the guest/host protocol and |
326 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 327 | */ |
39d70a4a | 328 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
329 | gpadl_body->pfn[i] = slow_virt_to_phys( |
330 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
331 | PAGE_SHIFT; | |
3e7ee490 | 332 | |
454f18a9 | 333 | /* add to msg header */ |
c50f7fb2 HZ |
334 | list_add_tail(&msgbody->msglistentry, |
335 | &msgheader->submsglist); | |
39d70a4a HZ |
336 | pfnsum += pfncurr; |
337 | pfnleft -= pfncurr; | |
3e7ee490 | 338 | } |
f4266e34 | 339 | } else { |
454f18a9 | 340 | /* everything fits in a header */ |
39d70a4a | 341 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 342 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
343 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
344 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
345 | if (msgheader == NULL) | |
e3eb7cdd | 346 | goto nomem; |
4d637632 VK |
347 | |
348 | INIT_LIST_HEAD(&msgheader->submsglist); | |
c50f7fb2 | 349 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
350 | |
351 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
352 | msgheader->msg; |
353 | gpadl_header->rangecount = 1; | |
354 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 355 | pagecount * sizeof(u64); |
415f2287 HZ |
356 | gpadl_header->range[0].byte_offset = 0; |
357 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 358 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
359 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
360 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
361 | |
362 | *msginfo = msgheader; | |
3e7ee490 HJ |
363 | } |
364 | ||
365 | return 0; | |
d1c250bb | 366 | nomem: |
39d70a4a HZ |
367 | kfree(msgheader); |
368 | kfree(msgbody); | |
d1c250bb | 369 | return -ENOMEM; |
3e7ee490 HJ |
370 | } |
371 | ||
3e189519 | 372 | /* |
fff41b2e | 373 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 374 | * |
39d70a4a | 375 | * @channel: a channel |
b679ef73 | 376 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
377 | * @size: page-size multiple |
378 | * @gpadl_handle: some funky thing | |
f4266e34 | 379 | */ |
fff41b2e | 380 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 381 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 382 | { |
39d70a4a HZ |
383 | struct vmbus_channel_gpadl_header *gpadlmsg; |
384 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a | 385 | struct vmbus_channel_msginfo *msginfo = NULL; |
7cc80c98 | 386 | struct vmbus_channel_msginfo *submsginfo, *tmp; |
53af545b | 387 | struct list_head *curr; |
39d70a4a | 388 | u32 next_gpadl_handle; |
dd0813b6 | 389 | unsigned long flags; |
c3bf2e26 | 390 | int ret = 0; |
3e7ee490 | 391 | |
9f52a163 S |
392 | next_gpadl_handle = |
393 | (atomic_inc_return(&vmbus_connection.next_gpadl_handle) - 1); | |
3e7ee490 | 394 | |
4d637632 | 395 | ret = create_gpadl_header(kbuffer, size, &msginfo); |
c3bf2e26 BP |
396 | if (ret) |
397 | return ret; | |
3e7ee490 | 398 | |
9568a193 | 399 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 400 | |
c50f7fb2 HZ |
401 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
402 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
403 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
404 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 405 | |
3e7ee490 | 406 | |
15b2f647 | 407 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 408 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 409 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 410 | |
15b2f647 | 411 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 412 | |
c6977677 | 413 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 414 | sizeof(*msginfo)); |
98e08702 | 415 | if (ret != 0) |
00d760b0 | 416 | goto cleanup; |
3e7ee490 | 417 | |
4d637632 VK |
418 | list_for_each(curr, &msginfo->submsglist) { |
419 | submsginfo = (struct vmbus_channel_msginfo *)curr; | |
420 | gpadl_body = | |
421 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; | |
53af545b | 422 | |
4d637632 VK |
423 | gpadl_body->header.msgtype = |
424 | CHANNELMSG_GPADL_BODY; | |
425 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 426 | |
4d637632 VK |
427 | ret = vmbus_post_msg(gpadl_body, |
428 | submsginfo->msgsize - | |
429 | sizeof(*submsginfo)); | |
430 | if (ret != 0) | |
431 | goto cleanup; | |
3e7ee490 | 432 | |
3e7ee490 | 433 | } |
72c6b71c | 434 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 435 | |
454f18a9 | 436 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 437 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 438 | |
00d760b0 | 439 | cleanup: |
15b2f647 | 440 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 441 | list_del(&msginfo->msglistentry); |
15b2f647 | 442 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
7cc80c98 VK |
443 | list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist, |
444 | msglistentry) { | |
445 | kfree(submsginfo); | |
446 | } | |
3e7ee490 | 447 | |
39d70a4a | 448 | kfree(msginfo); |
3e7ee490 HJ |
449 | return ret; |
450 | } | |
98873724 | 451 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 452 | |
3e189519 | 453 | /* |
fff41b2e | 454 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 455 | */ |
fff41b2e | 456 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 457 | { |
82250213 | 458 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 459 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 460 | unsigned long flags; |
66be6530 | 461 | int ret; |
3e7ee490 | 462 | |
f4266e34 GKH |
463 | info = kmalloc(sizeof(*info) + |
464 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
465 | if (!info) |
466 | return -ENOMEM; | |
3e7ee490 | 467 | |
9568a193 | 468 | init_completion(&info->waitevent); |
3e7ee490 | 469 | |
c50f7fb2 | 470 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 471 | |
c50f7fb2 HZ |
472 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
473 | msg->child_relid = channel->offermsg.child_relid; | |
474 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 475 | |
15b2f647 | 476 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 477 | list_add_tail(&info->msglistentry, |
da9fcb72 | 478 | &vmbus_connection.chn_msg_list); |
15b2f647 | 479 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 480 | ret = vmbus_post_msg(msg, |
f4266e34 | 481 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 482 | |
66be6530 S |
483 | if (ret) |
484 | goto post_msg_err; | |
485 | ||
486 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 487 | |
66be6530 | 488 | post_msg_err: |
15b2f647 | 489 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 490 | list_del(&info->msglistentry); |
15b2f647 | 491 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 492 | |
8c69f52a | 493 | kfree(info); |
3e7ee490 HJ |
494 | return ret; |
495 | } | |
18726d7a | 496 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 497 | |
d3ba720d S |
498 | static void reset_channel_cb(void *arg) |
499 | { | |
500 | struct vmbus_channel *channel = arg; | |
501 | ||
502 | channel->onchannel_callback = NULL; | |
503 | } | |
504 | ||
98d731bb | 505 | static int vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 506 | { |
82250213 | 507 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 508 | int ret; |
3e7ee490 | 509 | |
63d55b2a DC |
510 | /* |
511 | * process_chn_event(), running in the tasklet, can race | |
512 | * with vmbus_close_internal() in the case of SMP guest, e.g., when | |
513 | * the former is accessing channel->inbound.ring_buffer, the latter | |
514 | * could be freeing the ring_buffer pages. | |
515 | * | |
516 | * To resolve the race, we can serialize them by disabling the | |
517 | * tasklet when the latter is running here. | |
518 | */ | |
638fea33 | 519 | hv_event_tasklet_disable(channel); |
63d55b2a | 520 | |
64b7faf9 DC |
521 | /* |
522 | * In case a device driver's probe() fails (e.g., | |
523 | * util_probe() -> vmbus_open() returns -ENOMEM) and the device is | |
524 | * rescinded later (e.g., we dynamically disble an Integrated Service | |
525 | * in Hyper-V Manager), the driver's remove() invokes vmbus_close(): | |
526 | * here we should skip most of the below cleanup work. | |
527 | */ | |
528 | if (channel->state != CHANNEL_OPENED_STATE) { | |
529 | ret = -EINVAL; | |
530 | goto out; | |
531 | } | |
532 | ||
e68d2971 S |
533 | channel->state = CHANNEL_OPEN_STATE; |
534 | channel->sc_creation_callback = NULL; | |
454f18a9 | 535 | /* Stop callback and cancel the timer asap */ |
2115b561 S |
536 | if (channel->target_cpu != get_cpu()) { |
537 | put_cpu(); | |
d3ba720d S |
538 | smp_call_function_single(channel->target_cpu, reset_channel_cb, |
539 | channel, true); | |
2115b561 | 540 | } else { |
d3ba720d | 541 | reset_channel_cb(channel); |
2115b561 S |
542 | put_cpu(); |
543 | } | |
3e7ee490 | 544 | |
454f18a9 | 545 | /* Send a closing message */ |
3e7ee490 | 546 | |
e9a27a9f | 547 | msg = &channel->close_msg.msg; |
3e7ee490 | 548 | |
c50f7fb2 HZ |
549 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
550 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 551 | |
c6977677 | 552 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 553 | |
98d731bb S |
554 | if (ret) { |
555 | pr_err("Close failed: close post msg return is %d\n", ret); | |
556 | /* | |
557 | * If we failed to post the close msg, | |
558 | * it is perhaps better to leak memory. | |
559 | */ | |
63d55b2a | 560 | goto out; |
98d731bb S |
561 | } |
562 | ||
454f18a9 | 563 | /* Tear down the gpadl for the channel's ring buffer */ |
98d731bb S |
564 | if (channel->ringbuffer_gpadlhandle) { |
565 | ret = vmbus_teardown_gpadl(channel, | |
566 | channel->ringbuffer_gpadlhandle); | |
567 | if (ret) { | |
568 | pr_err("Close failed: teardown gpadl return %d\n", ret); | |
569 | /* | |
570 | * If we failed to teardown gpadl, | |
571 | * it is perhaps better to leak memory. | |
572 | */ | |
63d55b2a | 573 | goto out; |
98d731bb S |
574 | } |
575 | } | |
3e7ee490 | 576 | |
454f18a9 | 577 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
578 | hv_ringbuffer_cleanup(&channel->outbound); |
579 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 580 | |
df3493e0 S |
581 | free_pages((unsigned long)channel->ringbuffer_pages, |
582 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 583 | |
63d55b2a | 584 | out: |
638fea33 | 585 | hv_event_tasklet_enable(channel); |
63d55b2a | 586 | |
98d731bb | 587 | return ret; |
3e7ee490 | 588 | } |
e68d2971 S |
589 | |
590 | /* | |
591 | * vmbus_close - Close the specified channel | |
592 | */ | |
593 | void vmbus_close(struct vmbus_channel *channel) | |
594 | { | |
595 | struct list_head *cur, *tmp; | |
596 | struct vmbus_channel *cur_channel; | |
597 | ||
598 | if (channel->primary_channel != NULL) { | |
599 | /* | |
600 | * We will only close sub-channels when | |
601 | * the primary is closed. | |
602 | */ | |
603 | return; | |
604 | } | |
605 | /* | |
606 | * Close all the sub-channels first and then close the | |
607 | * primary channel. | |
608 | */ | |
609 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
610 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
611 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
612 | continue; | |
613 | vmbus_close_internal(cur_channel); | |
614 | } | |
615 | /* | |
616 | * Now close the primary. | |
617 | */ | |
618 | vmbus_close_internal(channel); | |
619 | } | |
70bfa307 | 620 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 621 | |
e9395e3f | 622 | int vmbus_sendpacket_ctl(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 623 | u32 bufferlen, u64 requestid, |
e9395e3f | 624 | enum vmbus_packet_type type, u32 flags, bool kick_q) |
3e7ee490 | 625 | { |
8dc0a06a | 626 | struct vmpacket_descriptor desc; |
39d70a4a | 627 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 628 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
011a7c3c | 629 | struct kvec bufferlist[3]; |
39d70a4a | 630 | u64 aligned_data = 0; |
f4266e34 | 631 | int ret; |
98fa8cf4 | 632 | bool signal = false; |
fe760e4d | 633 | bool lock = channel->acquire_ring_lock; |
b81658cf | 634 | int num_vecs = ((bufferlen != 0) ? 3 : 1); |
3e7ee490 | 635 | |
3e7ee490 | 636 | |
454f18a9 | 637 | /* Setup the descriptor */ |
415f2287 HZ |
638 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
639 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 640 | /* in 8-bytes granularity */ |
415f2287 HZ |
641 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
642 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
643 | desc.trans_id = requestid; | |
3e7ee490 | 644 | |
011a7c3c S |
645 | bufferlist[0].iov_base = &desc; |
646 | bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); | |
647 | bufferlist[1].iov_base = buffer; | |
648 | bufferlist[1].iov_len = bufferlen; | |
649 | bufferlist[2].iov_base = &aligned_data; | |
650 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 651 | |
b81658cf | 652 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, num_vecs, |
ccef9bcc | 653 | &signal, lock, channel->signal_policy); |
3e7ee490 | 654 | |
5f5cc817 S |
655 | /* |
656 | * Signalling the host is conditional on many factors: | |
657 | * 1. The ring state changed from being empty to non-empty. | |
658 | * This is tracked by the variable "signal". | |
659 | * 2. The variable kick_q tracks if more data will be placed | |
660 | * on the ring. We will not signal if more data is | |
661 | * to be placed. | |
662 | * | |
8599846d S |
663 | * Based on the channel signal state, we will decide |
664 | * which signaling policy will be applied. | |
665 | * | |
5f5cc817 S |
666 | * If we cannot write to the ring-buffer; signal the host |
667 | * even if we may not have written anything. This is a rare | |
668 | * enough condition that it should not matter. | |
5f363bc3 DC |
669 | * NOTE: in this case, the hvsock channel is an exception, because |
670 | * it looks the host side's hvsock implementation has a throttling | |
671 | * mechanism which can hurt the performance otherwise. | |
5f5cc817 | 672 | */ |
8599846d | 673 | |
5f363bc3 DC |
674 | if (((ret == 0) && kick_q && signal) || |
675 | (ret && !is_hvsock_channel(channel))) | |
fff41b2e | 676 | vmbus_setevent(channel); |
3e7ee490 | 677 | |
3e7ee490 HJ |
678 | return ret; |
679 | } | |
e9395e3f S |
680 | EXPORT_SYMBOL(vmbus_sendpacket_ctl); |
681 | ||
682 | /** | |
683 | * vmbus_sendpacket() - Send the specified buffer on the given channel | |
684 | * @channel: Pointer to vmbus_channel structure. | |
685 | * @buffer: Pointer to the buffer you want to receive the data into. | |
686 | * @bufferlen: Maximum size of what the the buffer will hold | |
687 | * @requestid: Identifier of the request | |
688 | * @type: Type of packet that is being send e.g. negotiate, time | |
689 | * packet etc. | |
690 | * | |
691 | * Sends data in @buffer directly to hyper-v via the vmbus | |
692 | * This will send the data unparsed to hyper-v. | |
693 | * | |
694 | * Mainly used by Hyper-V drivers. | |
695 | */ | |
696 | int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, | |
697 | u32 bufferlen, u64 requestid, | |
698 | enum vmbus_packet_type type, u32 flags) | |
699 | { | |
700 | return vmbus_sendpacket_ctl(channel, buffer, bufferlen, requestid, | |
701 | type, flags, true); | |
702 | } | |
fff41b2e | 703 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 704 | |
3e189519 | 705 | /* |
87e93d61 S |
706 | * vmbus_sendpacket_pagebuffer_ctl - Send a range of single-page buffer |
707 | * packets using a GPADL Direct packet type. This interface allows you | |
708 | * to control notifying the host. This will be useful for sending | |
709 | * batched data. Also the sender can control the send flags | |
710 | * explicitly. | |
f4266e34 | 711 | */ |
87e93d61 | 712 | int vmbus_sendpacket_pagebuffer_ctl(struct vmbus_channel *channel, |
39d70a4a HZ |
713 | struct hv_page_buffer pagebuffers[], |
714 | u32 pagecount, void *buffer, u32 bufferlen, | |
87e93d61 S |
715 | u64 requestid, |
716 | u32 flags, | |
717 | bool kick_q) | |
3e7ee490 | 718 | { |
f4266e34 GKH |
719 | int ret; |
720 | int i; | |
430a8e9a | 721 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
722 | u32 descsize; |
723 | u32 packetlen; | |
724 | u32 packetlen_aligned; | |
011a7c3c | 725 | struct kvec bufferlist[3]; |
39d70a4a | 726 | u64 aligned_data = 0; |
98fa8cf4 | 727 | bool signal = false; |
fe760e4d | 728 | bool lock = channel->acquire_ring_lock; |
3e7ee490 | 729 | |
39d70a4a | 730 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 731 | return -EINVAL; |
3e7ee490 | 732 | |
3e7ee490 | 733 | |
f4266e34 | 734 | /* |
430a8e9a | 735 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
736 | * largest size we support |
737 | */ | |
39d70a4a HZ |
738 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
739 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 740 | sizeof(struct hv_page_buffer)); |
39d70a4a | 741 | packetlen = descsize + bufferlen; |
73509681 | 742 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 743 | |
454f18a9 | 744 | /* Setup the descriptor */ |
415f2287 | 745 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
87e93d61 | 746 | desc.flags = flags; |
39d70a4a HZ |
747 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
748 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
749 | desc.transactionid = requestid; | |
750 | desc.rangecount = pagecount; | |
751 | ||
752 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
753 | desc.range[i].len = pagebuffers[i].len; |
754 | desc.range[i].offset = pagebuffers[i].offset; | |
755 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
756 | } |
757 | ||
011a7c3c S |
758 | bufferlist[0].iov_base = &desc; |
759 | bufferlist[0].iov_len = descsize; | |
760 | bufferlist[1].iov_base = buffer; | |
761 | bufferlist[1].iov_len = bufferlen; | |
762 | bufferlist[2].iov_base = &aligned_data; | |
763 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 764 | |
fe760e4d | 765 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, |
ccef9bcc | 766 | &signal, lock, channel->signal_policy); |
3e7ee490 | 767 | |
5f5cc817 S |
768 | /* |
769 | * Signalling the host is conditional on many factors: | |
770 | * 1. The ring state changed from being empty to non-empty. | |
771 | * This is tracked by the variable "signal". | |
772 | * 2. The variable kick_q tracks if more data will be placed | |
773 | * on the ring. We will not signal if more data is | |
774 | * to be placed. | |
775 | * | |
8599846d S |
776 | * Based on the channel signal state, we will decide |
777 | * which signaling policy will be applied. | |
778 | * | |
5f5cc817 S |
779 | * If we cannot write to the ring-buffer; signal the host |
780 | * even if we may not have written anything. This is a rare | |
781 | * enough condition that it should not matter. | |
782 | */ | |
8599846d | 783 | |
5f5cc817 | 784 | if (((ret == 0) && kick_q && signal) || (ret)) |
fff41b2e | 785 | vmbus_setevent(channel); |
3e7ee490 | 786 | |
3e7ee490 HJ |
787 | return ret; |
788 | } | |
b3a19b36 | 789 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer_ctl); |
87e93d61 S |
790 | |
791 | /* | |
792 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer | |
793 | * packets using a GPADL Direct packet type. | |
794 | */ | |
795 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, | |
796 | struct hv_page_buffer pagebuffers[], | |
797 | u32 pagecount, void *buffer, u32 bufferlen, | |
798 | u64 requestid) | |
799 | { | |
800 | u32 flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
801 | return vmbus_sendpacket_pagebuffer_ctl(channel, pagebuffers, pagecount, | |
802 | buffer, bufferlen, requestid, | |
803 | flags, true); | |
804 | ||
805 | } | |
713efeb4 | 806 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 807 | |
d61031ee S |
808 | /* |
809 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet | |
810 | * using a GPADL Direct packet type. | |
811 | * The buffer includes the vmbus descriptor. | |
812 | */ | |
813 | int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel, | |
814 | struct vmbus_packet_mpb_array *desc, | |
815 | u32 desc_size, | |
816 | void *buffer, u32 bufferlen, u64 requestid) | |
817 | { | |
818 | int ret; | |
819 | u32 packetlen; | |
820 | u32 packetlen_aligned; | |
821 | struct kvec bufferlist[3]; | |
822 | u64 aligned_data = 0; | |
823 | bool signal = false; | |
fe760e4d | 824 | bool lock = channel->acquire_ring_lock; |
d61031ee S |
825 | |
826 | packetlen = desc_size + bufferlen; | |
827 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); | |
828 | ||
829 | /* Setup the descriptor */ | |
830 | desc->type = VM_PKT_DATA_USING_GPA_DIRECT; | |
831 | desc->flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; | |
832 | desc->dataoffset8 = desc_size >> 3; /* in 8-bytes grandularity */ | |
833 | desc->length8 = (u16)(packetlen_aligned >> 3); | |
834 | desc->transactionid = requestid; | |
835 | desc->rangecount = 1; | |
836 | ||
837 | bufferlist[0].iov_base = desc; | |
838 | bufferlist[0].iov_len = desc_size; | |
839 | bufferlist[1].iov_base = buffer; | |
840 | bufferlist[1].iov_len = bufferlen; | |
841 | bufferlist[2].iov_base = &aligned_data; | |
842 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
843 | ||
fe760e4d | 844 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, |
ccef9bcc | 845 | &signal, lock, channel->signal_policy); |
d61031ee S |
846 | |
847 | if (ret == 0 && signal) | |
848 | vmbus_setevent(channel); | |
849 | ||
850 | return ret; | |
851 | } | |
852 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_mpb_desc); | |
853 | ||
3e189519 | 854 | /* |
fff41b2e | 855 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 856 | * using a GPADL Direct packet type. |
f4266e34 | 857 | */ |
fff41b2e | 858 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
859 | struct hv_multipage_buffer *multi_pagebuffer, |
860 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 861 | { |
f4266e34 | 862 | int ret; |
430a8e9a | 863 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
864 | u32 descsize; |
865 | u32 packetlen; | |
866 | u32 packetlen_aligned; | |
011a7c3c | 867 | struct kvec bufferlist[3]; |
39d70a4a | 868 | u64 aligned_data = 0; |
98fa8cf4 | 869 | bool signal = false; |
fe760e4d | 870 | bool lock = channel->acquire_ring_lock; |
ca623ad3 HZ |
871 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
872 | multi_pagebuffer->len); | |
3e7ee490 | 873 | |
24b8a406 | 874 | if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) |
002b53ea | 875 | return -EINVAL; |
3e7ee490 | 876 | |
f4266e34 | 877 | /* |
430a8e9a | 878 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
879 | * the largest size we support |
880 | */ | |
39d70a4a HZ |
881 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
882 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 883 | sizeof(u64)); |
39d70a4a | 884 | packetlen = descsize + bufferlen; |
73509681 | 885 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 886 | |
3e7ee490 | 887 | |
454f18a9 | 888 | /* Setup the descriptor */ |
415f2287 | 889 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 890 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
891 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
892 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
893 | desc.transactionid = requestid; | |
430a8e9a | 894 | desc.rangecount = 1; |
3e7ee490 | 895 | |
ca623ad3 HZ |
896 | desc.range.len = multi_pagebuffer->len; |
897 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 898 | |
ca623ad3 | 899 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 900 | pfncount * sizeof(u64)); |
3e7ee490 | 901 | |
011a7c3c S |
902 | bufferlist[0].iov_base = &desc; |
903 | bufferlist[0].iov_len = descsize; | |
904 | bufferlist[1].iov_base = buffer; | |
905 | bufferlist[1].iov_len = bufferlen; | |
906 | bufferlist[2].iov_base = &aligned_data; | |
907 | bufferlist[2].iov_len = (packetlen_aligned - packetlen); | |
3e7ee490 | 908 | |
fe760e4d | 909 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, |
ccef9bcc | 910 | &signal, lock, channel->signal_policy); |
3e7ee490 | 911 | |
98fa8cf4 | 912 | if (ret == 0 && signal) |
fff41b2e | 913 | vmbus_setevent(channel); |
3e7ee490 | 914 | |
3e7ee490 HJ |
915 | return ret; |
916 | } | |
4cb106fa | 917 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
918 | |
919 | /** | |
fff41b2e | 920 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
921 | * @channel: Pointer to vmbus_channel structure. |
922 | * @buffer: Pointer to the buffer you want to receive the data into. | |
923 | * @bufferlen: Maximum size of what the the buffer will hold | |
924 | * @buffer_actual_len: The actual size of the data after it was received | |
925 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
926 | * |
927 | * Receives directly from the hyper-v vmbus and puts the data it received | |
928 | * into Buffer. This will receive the data unparsed from hyper-v. | |
929 | * | |
930 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 931 | */ |
667d3740 VK |
932 | static inline int |
933 | __vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
934 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid, | |
935 | bool raw) | |
3e7ee490 | 936 | { |
3e7ee490 | 937 | int ret; |
c2b8e520 | 938 | bool signal = false; |
3e7ee490 | 939 | |
940b68e2 VK |
940 | ret = hv_ringbuffer_read(&channel->inbound, buffer, bufferlen, |
941 | buffer_actual_len, requestid, &signal, raw); | |
3e7ee490 | 942 | |
c2b8e520 S |
943 | if (signal) |
944 | vmbus_setevent(channel); | |
3e7ee490 | 945 | |
667d3740 VK |
946 | return ret; |
947 | } | |
948 | ||
949 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, | |
950 | u32 bufferlen, u32 *buffer_actual_len, | |
951 | u64 *requestid) | |
952 | { | |
953 | return __vmbus_recvpacket(channel, buffer, bufferlen, | |
954 | buffer_actual_len, requestid, false); | |
3e7ee490 | 955 | } |
fff41b2e | 956 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 957 | |
3e189519 | 958 | /* |
fff41b2e | 959 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 960 | */ |
fff41b2e | 961 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
962 | u32 bufferlen, u32 *buffer_actual_len, |
963 | u64 *requestid) | |
3e7ee490 | 964 | { |
667d3740 VK |
965 | return __vmbus_recvpacket(channel, buffer, bufferlen, |
966 | buffer_actual_len, requestid, true); | |
3e7ee490 | 967 | } |
adaee6bd | 968 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |