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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> |
3f335ea2 | 30 | |
0f2a6619 | 31 | #include "hyperv_vmbus.h" |
3e7ee490 | 32 | |
e3fe0bb6 S |
33 | #define NUM_PAGES_SPANNED(addr, len) \ |
34 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
35 | ||
3e189519 | 36 | /* |
fff41b2e | 37 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 38 | * channel. |
f4266e34 | 39 | */ |
fff41b2e | 40 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 41 | { |
39d70a4a | 42 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 43 | |
c50f7fb2 | 44 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 45 | /* Each u32 represents 32 channels */ |
22356585 | 46 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 47 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 48 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 49 | |
8681db44 GKH |
50 | /* Get the child to parent monitor page */ |
51 | monitorpage = vmbus_connection.monitor_pages[1]; | |
3e7ee490 | 52 | |
22356585 | 53 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
54 | (unsigned long *)&monitorpage->trigger_group |
55 | [channel->monitor_grp].pending); | |
7c369f40 | 56 | |
f4266e34 | 57 | } else { |
21c3bef5 | 58 | vmbus_set_event(channel); |
3e7ee490 | 59 | } |
3e7ee490 HJ |
60 | } |
61 | ||
3e189519 | 62 | /* |
fff41b2e | 63 | * vmbus_open - Open the specified channel. |
f4266e34 | 64 | */ |
fff41b2e | 65 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
66 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
67 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 68 | { |
0987ff69 | 69 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 70 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 71 | void *in, *out; |
dd0813b6 | 72 | unsigned long flags; |
9568a193 | 73 | int ret, t, err = 0; |
3e7ee490 | 74 | |
e68d2971 S |
75 | spin_lock_irqsave(&newchannel->sc_lock, flags); |
76 | if (newchannel->state == CHANNEL_OPEN_STATE) { | |
77 | newchannel->state = CHANNEL_OPENING_STATE; | |
78 | } else { | |
79 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
80 | return -EINVAL; | |
81 | } | |
82 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
83 | ||
c50f7fb2 HZ |
84 | newchannel->onchannel_callback = onchannelcallback; |
85 | newchannel->channel_callback_context = context; | |
3e7ee490 | 86 | |
454f18a9 | 87 | /* Allocate the ring buffer */ |
df3493e0 S |
88 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
89 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
90 | ||
7e052d98 BP |
91 | if (!out) |
92 | return -ENOMEM; | |
93 | ||
3e7ee490 | 94 | |
39d70a4a | 95 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 96 | |
c50f7fb2 HZ |
97 | newchannel->ringbuffer_pages = out; |
98 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 99 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 100 | |
72a95cbc S |
101 | ret = hv_ringbuffer_init( |
102 | &newchannel->outbound, out, send_ringbuffer_size); | |
103 | ||
fd4dc88e | 104 | if (ret != 0) { |
3324fb40 | 105 | err = ret; |
13925502 | 106 | goto error0; |
3324fb40 BP |
107 | } |
108 | ||
72a95cbc S |
109 | ret = hv_ringbuffer_init( |
110 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 111 | if (ret != 0) { |
3324fb40 | 112 | err = ret; |
13925502 | 113 | goto error0; |
3324fb40 | 114 | } |
3e7ee490 | 115 | |
3e7ee490 | 116 | |
454f18a9 | 117 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 118 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 119 | |
fff41b2e | 120 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 121 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
122 | send_ringbuffer_size + |
123 | recv_ringbuffer_size, | |
c50f7fb2 | 124 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 125 | |
fd4dc88e | 126 | if (ret != 0) { |
b94ef345 | 127 | err = ret; |
13925502 | 128 | goto error0; |
b94ef345 | 129 | } |
f4266e34 | 130 | |
454f18a9 | 131 | /* Create and init the channel open message */ |
176fb9e3 | 132 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
133 | sizeof(struct vmbus_channel_open_channel), |
134 | GFP_KERNEL); | |
176fb9e3 | 135 | if (!open_info) { |
c3bf2e26 | 136 | err = -ENOMEM; |
13925502 | 137 | goto error0; |
c3bf2e26 | 138 | } |
3e7ee490 | 139 | |
176fb9e3 | 140 | init_completion(&open_info->waitevent); |
3e7ee490 | 141 | |
176fb9e3 | 142 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
143 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
144 | open_msg->openid = newchannel->offermsg.child_relid; | |
145 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
146 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
147 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 148 | PAGE_SHIFT; |
abbf3b2a | 149 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 150 | |
39d70a4a | 151 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 152 | err = -EINVAL; |
13925502 | 153 | goto error0; |
c827f944 BP |
154 | } |
155 | ||
39d70a4a | 156 | if (userdatalen) |
0987ff69 | 157 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 158 | |
15b2f647 | 159 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 160 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 161 | &vmbus_connection.chn_msg_list); |
15b2f647 | 162 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 163 | |
0987ff69 | 164 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 165 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
166 | |
167 | if (ret != 0) | |
13925502 | 168 | goto error1; |
3e7ee490 | 169 | |
176fb9e3 | 170 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 171 | if (t == 0) { |
0c3b7b2f | 172 | err = -ETIMEDOUT; |
13925502 | 173 | goto error1; |
0c3b7b2f S |
174 | } |
175 | ||
3e7ee490 | 176 | |
176fb9e3 S |
177 | if (open_info->response.open_result.status) |
178 | err = open_info->response.open_result.status; | |
3e7ee490 | 179 | |
15b2f647 | 180 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 181 | list_del(&open_info->msglistentry); |
15b2f647 | 182 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 183 | |
e68d2971 S |
184 | if (err == 0) |
185 | newchannel->state = CHANNEL_OPENED_STATE; | |
186 | ||
176fb9e3 | 187 | kfree(open_info); |
98e08702 | 188 | return err; |
c3bf2e26 | 189 | |
13925502 S |
190 | error1: |
191 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
192 | list_del(&open_info->msglistentry); | |
193 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
194 | ||
195 | error0: | |
df3493e0 S |
196 | free_pages((unsigned long)out, |
197 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 198 | kfree(open_info); |
c3bf2e26 | 199 | return err; |
3e7ee490 | 200 | } |
36ceadfc | 201 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 202 | |
3e189519 | 203 | /* |
fff41b2e | 204 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 205 | */ |
fff41b2e | 206 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
207 | struct vmbus_channel_msginfo **msginfo, |
208 | u32 *messagecount) | |
3e7ee490 HJ |
209 | { |
210 | int i; | |
39d70a4a | 211 | int pagecount; |
39d70a4a HZ |
212 | struct vmbus_channel_gpadl_header *gpadl_header; |
213 | struct vmbus_channel_gpadl_body *gpadl_body; | |
214 | struct vmbus_channel_msginfo *msgheader; | |
215 | struct vmbus_channel_msginfo *msgbody = NULL; | |
216 | u32 msgsize; | |
3e7ee490 | 217 | |
39d70a4a | 218 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 219 | |
39d70a4a | 220 | pagecount = size >> PAGE_SHIFT; |
3e7ee490 | 221 | |
454f18a9 | 222 | /* do we need a gpadl body msg */ |
39d70a4a | 223 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
224 | sizeof(struct vmbus_channel_gpadl_header) - |
225 | sizeof(struct gpa_range); | |
39d70a4a | 226 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 227 | |
39d70a4a | 228 | if (pagecount > pfncount) { |
f4266e34 | 229 | /* we need a gpadl body */ |
454f18a9 | 230 | /* fill in the header */ |
39d70a4a | 231 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 232 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
233 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
234 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
235 | if (!msgheader) | |
d1c250bb | 236 | goto nomem; |
3e7ee490 | 237 | |
c50f7fb2 HZ |
238 | INIT_LIST_HEAD(&msgheader->submsglist); |
239 | msgheader->msgsize = msgsize; | |
3e7ee490 | 240 | |
39d70a4a | 241 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
242 | msgheader->msg; |
243 | gpadl_header->rangecount = 1; | |
244 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 245 | pagecount * sizeof(u64); |
415f2287 HZ |
246 | gpadl_header->range[0].byte_offset = 0; |
247 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 248 | for (i = 0; i < pfncount; i++) |
b679ef73 HZ |
249 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
250 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
251 | *msginfo = msgheader; |
252 | *messagecount = 1; | |
3e7ee490 | 253 | |
39d70a4a HZ |
254 | pfnsum = pfncount; |
255 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 256 | |
454f18a9 | 257 | /* how many pfns can we fit */ |
39d70a4a | 258 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 259 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 260 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 261 | |
454f18a9 | 262 | /* fill in the body */ |
39d70a4a HZ |
263 | while (pfnleft) { |
264 | if (pfnleft > pfncount) | |
265 | pfncurr = pfncount; | |
3e7ee490 | 266 | else |
39d70a4a | 267 | pfncurr = pfnleft; |
3e7ee490 | 268 | |
39d70a4a | 269 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 270 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
271 | pfncurr * sizeof(u64); |
272 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
273 | |
274 | if (!msgbody) { | |
275 | struct vmbus_channel_msginfo *pos = NULL; | |
276 | struct vmbus_channel_msginfo *tmp = NULL; | |
277 | /* | |
278 | * Free up all the allocated messages. | |
279 | */ | |
280 | list_for_each_entry_safe(pos, tmp, | |
281 | &msgheader->submsglist, | |
282 | msglistentry) { | |
283 | ||
284 | list_del(&pos->msglistentry); | |
285 | kfree(pos); | |
286 | } | |
287 | ||
d1c250bb | 288 | goto nomem; |
f38cf9cc S |
289 | } |
290 | ||
c50f7fb2 | 291 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
292 | (*messagecount)++; |
293 | gpadl_body = | |
c50f7fb2 | 294 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
295 | |
296 | /* | |
f4266e34 GKH |
297 | * Gpadl is u32 and we are using a pointer which could |
298 | * be 64-bit | |
f27df643 S |
299 | * This is governed by the guest/host protocol and |
300 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 301 | */ |
39d70a4a | 302 | for (i = 0; i < pfncurr; i++) |
b679ef73 HZ |
303 | gpadl_body->pfn[i] = slow_virt_to_phys( |
304 | kbuffer + PAGE_SIZE * (pfnsum + i)) >> | |
305 | PAGE_SHIFT; | |
3e7ee490 | 306 | |
454f18a9 | 307 | /* add to msg header */ |
c50f7fb2 HZ |
308 | list_add_tail(&msgbody->msglistentry, |
309 | &msgheader->submsglist); | |
39d70a4a HZ |
310 | pfnsum += pfncurr; |
311 | pfnleft -= pfncurr; | |
3e7ee490 | 312 | } |
f4266e34 | 313 | } else { |
454f18a9 | 314 | /* everything fits in a header */ |
39d70a4a | 315 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 316 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
317 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
318 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
319 | if (msgheader == NULL) | |
e3eb7cdd | 320 | goto nomem; |
c50f7fb2 | 321 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
322 | |
323 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
324 | msgheader->msg; |
325 | gpadl_header->rangecount = 1; | |
326 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 327 | pagecount * sizeof(u64); |
415f2287 HZ |
328 | gpadl_header->range[0].byte_offset = 0; |
329 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 330 | for (i = 0; i < pagecount; i++) |
b679ef73 HZ |
331 | gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( |
332 | kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; | |
39d70a4a HZ |
333 | |
334 | *msginfo = msgheader; | |
335 | *messagecount = 1; | |
3e7ee490 HJ |
336 | } |
337 | ||
338 | return 0; | |
d1c250bb | 339 | nomem: |
39d70a4a HZ |
340 | kfree(msgheader); |
341 | kfree(msgbody); | |
d1c250bb | 342 | return -ENOMEM; |
3e7ee490 HJ |
343 | } |
344 | ||
3e189519 | 345 | /* |
fff41b2e | 346 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 347 | * |
39d70a4a | 348 | * @channel: a channel |
b679ef73 | 349 | * @kbuffer: from kmalloc or vmalloc |
39d70a4a HZ |
350 | * @size: page-size multiple |
351 | * @gpadl_handle: some funky thing | |
f4266e34 | 352 | */ |
fff41b2e | 353 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 354 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 355 | { |
39d70a4a HZ |
356 | struct vmbus_channel_gpadl_header *gpadlmsg; |
357 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
358 | struct vmbus_channel_msginfo *msginfo = NULL; |
359 | struct vmbus_channel_msginfo *submsginfo; | |
360 | u32 msgcount; | |
53af545b | 361 | struct list_head *curr; |
39d70a4a | 362 | u32 next_gpadl_handle; |
dd0813b6 | 363 | unsigned long flags; |
c3bf2e26 | 364 | int ret = 0; |
9568a193 | 365 | int t; |
3e7ee490 | 366 | |
da9fcb72 HZ |
367 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
368 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 369 | |
fff41b2e | 370 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
371 | if (ret) |
372 | return ret; | |
3e7ee490 | 373 | |
9568a193 | 374 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 375 | |
c50f7fb2 HZ |
376 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
377 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
378 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
379 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 380 | |
3e7ee490 | 381 | |
15b2f647 | 382 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 383 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 384 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 385 | |
15b2f647 | 386 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 387 | |
c6977677 | 388 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 389 | sizeof(*msginfo)); |
98e08702 | 390 | if (ret != 0) |
00d760b0 | 391 | goto cleanup; |
3e7ee490 | 392 | |
39d70a4a | 393 | if (msgcount > 1) { |
c50f7fb2 | 394 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 395 | |
39d70a4a HZ |
396 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
397 | gpadl_body = | |
c50f7fb2 | 398 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 399 | |
c50f7fb2 HZ |
400 | gpadl_body->header.msgtype = |
401 | CHANNELMSG_GPADL_BODY; | |
402 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 403 | |
c6977677 | 404 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 405 | submsginfo->msgsize - |
39d70a4a | 406 | sizeof(*submsginfo)); |
fd4dc88e | 407 | if (ret != 0) |
00d760b0 | 408 | goto cleanup; |
99259159 | 409 | |
3e7ee490 HJ |
410 | } |
411 | } | |
40961de3 | 412 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 413 | BUG_ON(t == 0); |
0c3b7b2f | 414 | |
3e7ee490 | 415 | |
454f18a9 | 416 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 417 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 418 | |
00d760b0 | 419 | cleanup: |
15b2f647 | 420 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 421 | list_del(&msginfo->msglistentry); |
15b2f647 | 422 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 423 | |
39d70a4a | 424 | kfree(msginfo); |
3e7ee490 HJ |
425 | return ret; |
426 | } | |
98873724 | 427 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 428 | |
3e189519 | 429 | /* |
fff41b2e | 430 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 431 | */ |
fff41b2e | 432 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 433 | { |
82250213 | 434 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 435 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 436 | unsigned long flags; |
9568a193 | 437 | int ret, t; |
3e7ee490 | 438 | |
f4266e34 GKH |
439 | info = kmalloc(sizeof(*info) + |
440 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
441 | if (!info) |
442 | return -ENOMEM; | |
3e7ee490 | 443 | |
9568a193 | 444 | init_completion(&info->waitevent); |
3e7ee490 | 445 | |
c50f7fb2 | 446 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 447 | |
c50f7fb2 HZ |
448 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
449 | msg->child_relid = channel->offermsg.child_relid; | |
450 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 451 | |
15b2f647 | 452 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 453 | list_add_tail(&info->msglistentry, |
da9fcb72 | 454 | &vmbus_connection.chn_msg_list); |
15b2f647 | 455 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 456 | ret = vmbus_post_msg(msg, |
f4266e34 | 457 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 458 | |
0c3b7b2f | 459 | BUG_ON(ret != 0); |
40961de3 | 460 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 461 | BUG_ON(t == 0); |
3e7ee490 | 462 | |
454f18a9 | 463 | /* Received a torndown response */ |
15b2f647 | 464 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 465 | list_del(&info->msglistentry); |
15b2f647 | 466 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 467 | |
8c69f52a | 468 | kfree(info); |
3e7ee490 HJ |
469 | return ret; |
470 | } | |
18726d7a | 471 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 472 | |
e68d2971 | 473 | static void vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 474 | { |
82250213 | 475 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 476 | int ret; |
dad76bf7 | 477 | unsigned long flags; |
3e7ee490 | 478 | |
e68d2971 S |
479 | channel->state = CHANNEL_OPEN_STATE; |
480 | channel->sc_creation_callback = NULL; | |
454f18a9 | 481 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 482 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 483 | channel->onchannel_callback = NULL; |
dad76bf7 | 484 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 485 | |
454f18a9 | 486 | /* Send a closing message */ |
3e7ee490 | 487 | |
e9a27a9f | 488 | msg = &channel->close_msg.msg; |
3e7ee490 | 489 | |
c50f7fb2 HZ |
490 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
491 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 492 | |
c6977677 | 493 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 494 | |
0c3b7b2f | 495 | BUG_ON(ret != 0); |
454f18a9 | 496 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 497 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 498 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 499 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 500 | |
454f18a9 | 501 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
502 | hv_ringbuffer_cleanup(&channel->outbound); |
503 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 504 | |
df3493e0 S |
505 | free_pages((unsigned long)channel->ringbuffer_pages, |
506 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 507 | |
3e7ee490 | 508 | |
3e7ee490 | 509 | } |
e68d2971 S |
510 | |
511 | /* | |
512 | * vmbus_close - Close the specified channel | |
513 | */ | |
514 | void vmbus_close(struct vmbus_channel *channel) | |
515 | { | |
516 | struct list_head *cur, *tmp; | |
517 | struct vmbus_channel *cur_channel; | |
518 | ||
519 | if (channel->primary_channel != NULL) { | |
520 | /* | |
521 | * We will only close sub-channels when | |
522 | * the primary is closed. | |
523 | */ | |
524 | return; | |
525 | } | |
526 | /* | |
527 | * Close all the sub-channels first and then close the | |
528 | * primary channel. | |
529 | */ | |
530 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
531 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
532 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
533 | continue; | |
534 | vmbus_close_internal(cur_channel); | |
535 | } | |
536 | /* | |
537 | * Now close the primary. | |
538 | */ | |
539 | vmbus_close_internal(channel); | |
540 | } | |
70bfa307 | 541 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 542 | |
c88c4e4c | 543 | /** |
fff41b2e | 544 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
545 | * @channel: Pointer to vmbus_channel structure. |
546 | * @buffer: Pointer to the buffer you want to receive the data into. | |
547 | * @bufferlen: Maximum size of what the the buffer will hold | |
548 | * @requestid: Identifier of the request | |
549 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
550 | * packet etc. |
551 | * | |
39d70a4a | 552 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
553 | * This will send the data unparsed to hyper-v. |
554 | * | |
555 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 556 | */ |
fff41b2e | 557 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
558 | u32 bufferlen, u64 requestid, |
559 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 560 | { |
8dc0a06a | 561 | struct vmpacket_descriptor desc; |
39d70a4a | 562 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 563 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
564 | struct scatterlist bufferlist[3]; |
565 | u64 aligned_data = 0; | |
f4266e34 | 566 | int ret; |
98fa8cf4 | 567 | bool signal = false; |
3e7ee490 | 568 | |
3e7ee490 | 569 | |
454f18a9 | 570 | /* Setup the descriptor */ |
415f2287 HZ |
571 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
572 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 573 | /* in 8-bytes granularity */ |
415f2287 HZ |
574 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
575 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
576 | desc.trans_id = requestid; | |
3e7ee490 | 577 | |
39d70a4a HZ |
578 | sg_init_table(bufferlist, 3); |
579 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
580 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
581 | sg_set_buf(&bufferlist[2], &aligned_data, | |
582 | packetlen_aligned - packetlen); | |
3e7ee490 | 583 | |
98fa8cf4 | 584 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 585 | |
98fa8cf4 | 586 | if (ret == 0 && signal) |
fff41b2e | 587 | vmbus_setevent(channel); |
3e7ee490 | 588 | |
3e7ee490 HJ |
589 | return ret; |
590 | } | |
fff41b2e | 591 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 592 | |
3e189519 | 593 | /* |
fff41b2e | 594 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 595 | * packets using a GPADL Direct packet type. |
f4266e34 | 596 | */ |
fff41b2e | 597 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
598 | struct hv_page_buffer pagebuffers[], |
599 | u32 pagecount, void *buffer, u32 bufferlen, | |
600 | u64 requestid) | |
3e7ee490 | 601 | { |
f4266e34 GKH |
602 | int ret; |
603 | int i; | |
430a8e9a | 604 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
605 | u32 descsize; |
606 | u32 packetlen; | |
607 | u32 packetlen_aligned; | |
608 | struct scatterlist bufferlist[3]; | |
609 | u64 aligned_data = 0; | |
98fa8cf4 | 610 | bool signal = false; |
3e7ee490 | 611 | |
39d70a4a | 612 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 613 | return -EINVAL; |
3e7ee490 | 614 | |
3e7ee490 | 615 | |
f4266e34 | 616 | /* |
430a8e9a | 617 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
618 | * largest size we support |
619 | */ | |
39d70a4a HZ |
620 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
621 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 622 | sizeof(struct hv_page_buffer)); |
39d70a4a | 623 | packetlen = descsize + bufferlen; |
73509681 | 624 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 625 | |
454f18a9 | 626 | /* Setup the descriptor */ |
415f2287 | 627 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 628 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
629 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
630 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
631 | desc.transactionid = requestid; | |
632 | desc.rangecount = pagecount; | |
633 | ||
634 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
635 | desc.range[i].len = pagebuffers[i].len; |
636 | desc.range[i].offset = pagebuffers[i].offset; | |
637 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
638 | } |
639 | ||
39d70a4a HZ |
640 | sg_init_table(bufferlist, 3); |
641 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
642 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
643 | sg_set_buf(&bufferlist[2], &aligned_data, | |
644 | packetlen_aligned - packetlen); | |
3e7ee490 | 645 | |
98fa8cf4 | 646 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 647 | |
98fa8cf4 | 648 | if (ret == 0 && signal) |
fff41b2e | 649 | vmbus_setevent(channel); |
3e7ee490 | 650 | |
3e7ee490 HJ |
651 | return ret; |
652 | } | |
713efeb4 | 653 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 654 | |
3e189519 | 655 | /* |
fff41b2e | 656 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 657 | * using a GPADL Direct packet type. |
f4266e34 | 658 | */ |
fff41b2e | 659 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
660 | struct hv_multipage_buffer *multi_pagebuffer, |
661 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 662 | { |
f4266e34 | 663 | int ret; |
430a8e9a | 664 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
665 | u32 descsize; |
666 | u32 packetlen; | |
667 | u32 packetlen_aligned; | |
668 | struct scatterlist bufferlist[3]; | |
669 | u64 aligned_data = 0; | |
98fa8cf4 | 670 | bool signal = false; |
ca623ad3 HZ |
671 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
672 | multi_pagebuffer->len); | |
3e7ee490 | 673 | |
3e7ee490 | 674 | |
39d70a4a | 675 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 676 | return -EINVAL; |
3e7ee490 | 677 | |
f4266e34 | 678 | /* |
430a8e9a | 679 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
680 | * the largest size we support |
681 | */ | |
39d70a4a HZ |
682 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
683 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 684 | sizeof(u64)); |
39d70a4a | 685 | packetlen = descsize + bufferlen; |
73509681 | 686 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 687 | |
3e7ee490 | 688 | |
454f18a9 | 689 | /* Setup the descriptor */ |
415f2287 | 690 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 691 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
692 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
693 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
694 | desc.transactionid = requestid; | |
430a8e9a | 695 | desc.rangecount = 1; |
3e7ee490 | 696 | |
ca623ad3 HZ |
697 | desc.range.len = multi_pagebuffer->len; |
698 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 699 | |
ca623ad3 | 700 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 701 | pfncount * sizeof(u64)); |
3e7ee490 | 702 | |
39d70a4a HZ |
703 | sg_init_table(bufferlist, 3); |
704 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
705 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
706 | sg_set_buf(&bufferlist[2], &aligned_data, | |
707 | packetlen_aligned - packetlen); | |
3e7ee490 | 708 | |
98fa8cf4 | 709 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 710 | |
98fa8cf4 | 711 | if (ret == 0 && signal) |
fff41b2e | 712 | vmbus_setevent(channel); |
3e7ee490 | 713 | |
3e7ee490 HJ |
714 | return ret; |
715 | } | |
4cb106fa | 716 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
717 | |
718 | /** | |
fff41b2e | 719 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
720 | * @channel: Pointer to vmbus_channel structure. |
721 | * @buffer: Pointer to the buffer you want to receive the data into. | |
722 | * @bufferlen: Maximum size of what the the buffer will hold | |
723 | * @buffer_actual_len: The actual size of the data after it was received | |
724 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
725 | * |
726 | * Receives directly from the hyper-v vmbus and puts the data it received | |
727 | * into Buffer. This will receive the data unparsed from hyper-v. | |
728 | * | |
729 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 730 | */ |
fff41b2e | 731 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 732 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 733 | { |
8dc0a06a | 734 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
735 | u32 packetlen; |
736 | u32 userlen; | |
3e7ee490 | 737 | int ret; |
c2b8e520 | 738 | bool signal = false; |
3e7ee490 | 739 | |
39d70a4a HZ |
740 | *buffer_actual_len = 0; |
741 | *requestid = 0; | |
3e7ee490 | 742 | |
3e7ee490 | 743 | |
a89186c2 | 744 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 745 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 746 | if (ret != 0) |
3e7ee490 | 747 | return 0; |
3e7ee490 | 748 | |
415f2287 HZ |
749 | packetlen = desc.len8 << 3; |
750 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 751 | |
39d70a4a | 752 | *buffer_actual_len = userlen; |
3e7ee490 | 753 | |
39d70a4a | 754 | if (userlen > bufferlen) { |
3e7ee490 | 755 | |
0a46618d | 756 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 757 | bufferlen, userlen); |
926ae526 | 758 | return -ETOOSMALL; |
3e7ee490 HJ |
759 | } |
760 | ||
415f2287 | 761 | *requestid = desc.trans_id; |
3e7ee490 | 762 | |
454f18a9 | 763 | /* Copy over the packet to the user buffer */ |
38397c8a | 764 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 765 | (desc.offset8 << 3), &signal); |
3e7ee490 | 766 | |
c2b8e520 S |
767 | if (signal) |
768 | vmbus_setevent(channel); | |
3e7ee490 | 769 | |
3e7ee490 HJ |
770 | return 0; |
771 | } | |
fff41b2e | 772 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 773 | |
3e189519 | 774 | /* |
fff41b2e | 775 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 776 | */ |
fff41b2e | 777 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
778 | u32 bufferlen, u32 *buffer_actual_len, |
779 | u64 *requestid) | |
3e7ee490 | 780 | { |
8dc0a06a | 781 | struct vmpacket_descriptor desc; |
39d70a4a | 782 | u32 packetlen; |
3e7ee490 | 783 | int ret; |
c2b8e520 | 784 | bool signal = false; |
3e7ee490 | 785 | |
39d70a4a HZ |
786 | *buffer_actual_len = 0; |
787 | *requestid = 0; | |
3e7ee490 | 788 | |
3e7ee490 | 789 | |
a89186c2 | 790 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 791 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 792 | if (ret != 0) |
3e7ee490 | 793 | return 0; |
3e7ee490 | 794 | |
3e7ee490 | 795 | |
415f2287 | 796 | packetlen = desc.len8 << 3; |
3e7ee490 | 797 | |
39d70a4a | 798 | *buffer_actual_len = packetlen; |
3e7ee490 | 799 | |
39d70a4a | 800 | if (packetlen > bufferlen) { |
0a46618d HJ |
801 | pr_err("Buffer too small - needed %d bytes but " |
802 | "got space for only %d bytes\n", | |
803 | packetlen, bufferlen); | |
3d5cad97 | 804 | return -ENOBUFS; |
3e7ee490 HJ |
805 | } |
806 | ||
415f2287 | 807 | *requestid = desc.trans_id; |
3e7ee490 | 808 | |
454f18a9 | 809 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
810 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
811 | &signal); | |
812 | ||
813 | if (signal) | |
814 | vmbus_setevent(channel); | |
3e7ee490 | 815 | |
33b06938 | 816 | return ret; |
3e7ee490 | 817 | } |
adaee6bd | 818 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |