Commit | Line | Data |
---|---|---|
3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
5654e932 | 23 | #include <linux/kernel.h> |
0c3b7b2f S |
24 | #include <linux/sched.h> |
25 | #include <linux/wait.h> | |
a0086dc5 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
c88c4e4c | 28 | #include <linux/module.h> |
46a97191 | 29 | #include <linux/hyperv.h> |
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_get_debug_info -Retrieve various channel debug info |
f4266e34 | 64 | */ |
fff41b2e | 65 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
39d70a4a | 66 | struct vmbus_channel_debug_info *debuginfo) |
3e7ee490 | 67 | { |
a75b61d5 S |
68 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
69 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
70 | } |
71 | ||
3e189519 | 72 | /* |
fff41b2e | 73 | * vmbus_open - Open the specified channel. |
f4266e34 | 74 | */ |
fff41b2e | 75 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
76 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
77 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 78 | { |
0987ff69 | 79 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 80 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 81 | void *in, *out; |
dd0813b6 | 82 | unsigned long flags; |
9568a193 | 83 | int ret, t, err = 0; |
3e7ee490 | 84 | |
e68d2971 S |
85 | spin_lock_irqsave(&newchannel->sc_lock, flags); |
86 | if (newchannel->state == CHANNEL_OPEN_STATE) { | |
87 | newchannel->state = CHANNEL_OPENING_STATE; | |
88 | } else { | |
89 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
90 | return -EINVAL; | |
91 | } | |
92 | spin_unlock_irqrestore(&newchannel->sc_lock, flags); | |
93 | ||
c50f7fb2 HZ |
94 | newchannel->onchannel_callback = onchannelcallback; |
95 | newchannel->channel_callback_context = context; | |
3e7ee490 | 96 | |
454f18a9 | 97 | /* Allocate the ring buffer */ |
df3493e0 S |
98 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
99 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
100 | ||
7e052d98 BP |
101 | if (!out) |
102 | return -ENOMEM; | |
103 | ||
3e7ee490 | 104 | |
39d70a4a | 105 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 106 | |
c50f7fb2 HZ |
107 | newchannel->ringbuffer_pages = out; |
108 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 109 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 110 | |
72a95cbc S |
111 | ret = hv_ringbuffer_init( |
112 | &newchannel->outbound, out, send_ringbuffer_size); | |
113 | ||
fd4dc88e | 114 | if (ret != 0) { |
3324fb40 | 115 | err = ret; |
13925502 | 116 | goto error0; |
3324fb40 BP |
117 | } |
118 | ||
72a95cbc S |
119 | ret = hv_ringbuffer_init( |
120 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 121 | if (ret != 0) { |
3324fb40 | 122 | err = ret; |
13925502 | 123 | goto error0; |
3324fb40 | 124 | } |
3e7ee490 | 125 | |
3e7ee490 | 126 | |
454f18a9 | 127 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 128 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 129 | |
fff41b2e | 130 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 131 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
132 | send_ringbuffer_size + |
133 | recv_ringbuffer_size, | |
c50f7fb2 | 134 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 135 | |
fd4dc88e | 136 | if (ret != 0) { |
b94ef345 | 137 | err = ret; |
13925502 | 138 | goto error0; |
b94ef345 | 139 | } |
f4266e34 | 140 | |
454f18a9 | 141 | /* Create and init the channel open message */ |
176fb9e3 | 142 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
143 | sizeof(struct vmbus_channel_open_channel), |
144 | GFP_KERNEL); | |
176fb9e3 | 145 | if (!open_info) { |
c3bf2e26 | 146 | err = -ENOMEM; |
13925502 | 147 | goto error0; |
c3bf2e26 | 148 | } |
3e7ee490 | 149 | |
176fb9e3 | 150 | init_completion(&open_info->waitevent); |
3e7ee490 | 151 | |
176fb9e3 | 152 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
153 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
154 | open_msg->openid = newchannel->offermsg.child_relid; | |
155 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
156 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
157 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 158 | PAGE_SHIFT; |
abbf3b2a | 159 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 160 | |
39d70a4a | 161 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 162 | err = -EINVAL; |
13925502 | 163 | goto error0; |
c827f944 BP |
164 | } |
165 | ||
39d70a4a | 166 | if (userdatalen) |
0987ff69 | 167 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 168 | |
15b2f647 | 169 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 170 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 171 | &vmbus_connection.chn_msg_list); |
15b2f647 | 172 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 173 | |
0987ff69 | 174 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 175 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
176 | |
177 | if (ret != 0) | |
13925502 | 178 | goto error1; |
3e7ee490 | 179 | |
176fb9e3 | 180 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 181 | if (t == 0) { |
0c3b7b2f | 182 | err = -ETIMEDOUT; |
13925502 | 183 | goto error1; |
0c3b7b2f S |
184 | } |
185 | ||
3e7ee490 | 186 | |
176fb9e3 S |
187 | if (open_info->response.open_result.status) |
188 | err = open_info->response.open_result.status; | |
3e7ee490 | 189 | |
15b2f647 | 190 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 191 | list_del(&open_info->msglistentry); |
15b2f647 | 192 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 193 | |
e68d2971 S |
194 | if (err == 0) |
195 | newchannel->state = CHANNEL_OPENED_STATE; | |
196 | ||
176fb9e3 | 197 | kfree(open_info); |
98e08702 | 198 | return err; |
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 | ||
205 | error0: | |
df3493e0 S |
206 | free_pages((unsigned long)out, |
207 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 208 | kfree(open_info); |
c3bf2e26 | 209 | return err; |
3e7ee490 | 210 | } |
36ceadfc | 211 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 212 | |
3e189519 | 213 | /* |
fff41b2e | 214 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 215 | */ |
fff41b2e | 216 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
217 | struct vmbus_channel_msginfo **msginfo, |
218 | u32 *messagecount) | |
3e7ee490 HJ |
219 | { |
220 | int i; | |
39d70a4a | 221 | int pagecount; |
f4266e34 | 222 | unsigned long long pfn; |
39d70a4a HZ |
223 | struct vmbus_channel_gpadl_header *gpadl_header; |
224 | struct vmbus_channel_gpadl_body *gpadl_body; | |
225 | struct vmbus_channel_msginfo *msgheader; | |
226 | struct vmbus_channel_msginfo *msgbody = NULL; | |
227 | u32 msgsize; | |
3e7ee490 | 228 | |
39d70a4a | 229 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 230 | |
39d70a4a HZ |
231 | pagecount = size >> PAGE_SHIFT; |
232 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 233 | |
454f18a9 | 234 | /* do we need a gpadl body msg */ |
39d70a4a | 235 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
236 | sizeof(struct vmbus_channel_gpadl_header) - |
237 | sizeof(struct gpa_range); | |
39d70a4a | 238 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 239 | |
39d70a4a | 240 | if (pagecount > pfncount) { |
f4266e34 | 241 | /* we need a gpadl body */ |
454f18a9 | 242 | /* fill in the header */ |
39d70a4a | 243 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 244 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
245 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
246 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
247 | if (!msgheader) | |
d1c250bb | 248 | goto nomem; |
3e7ee490 | 249 | |
c50f7fb2 HZ |
250 | INIT_LIST_HEAD(&msgheader->submsglist); |
251 | msgheader->msgsize = msgsize; | |
3e7ee490 | 252 | |
39d70a4a | 253 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
254 | msgheader->msg; |
255 | gpadl_header->rangecount = 1; | |
256 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 257 | pagecount * sizeof(u64); |
415f2287 HZ |
258 | gpadl_header->range[0].byte_offset = 0; |
259 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 260 | for (i = 0; i < pfncount; i++) |
415f2287 | 261 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
262 | *msginfo = msgheader; |
263 | *messagecount = 1; | |
3e7ee490 | 264 | |
39d70a4a HZ |
265 | pfnsum = pfncount; |
266 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 267 | |
454f18a9 | 268 | /* how many pfns can we fit */ |
39d70a4a | 269 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 270 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 271 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 272 | |
454f18a9 | 273 | /* fill in the body */ |
39d70a4a HZ |
274 | while (pfnleft) { |
275 | if (pfnleft > pfncount) | |
276 | pfncurr = pfncount; | |
3e7ee490 | 277 | else |
39d70a4a | 278 | pfncurr = pfnleft; |
3e7ee490 | 279 | |
39d70a4a | 280 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 281 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
282 | pfncurr * sizeof(u64); |
283 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
284 | |
285 | if (!msgbody) { | |
286 | struct vmbus_channel_msginfo *pos = NULL; | |
287 | struct vmbus_channel_msginfo *tmp = NULL; | |
288 | /* | |
289 | * Free up all the allocated messages. | |
290 | */ | |
291 | list_for_each_entry_safe(pos, tmp, | |
292 | &msgheader->submsglist, | |
293 | msglistentry) { | |
294 | ||
295 | list_del(&pos->msglistentry); | |
296 | kfree(pos); | |
297 | } | |
298 | ||
d1c250bb | 299 | goto nomem; |
f38cf9cc S |
300 | } |
301 | ||
c50f7fb2 | 302 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
303 | (*messagecount)++; |
304 | gpadl_body = | |
c50f7fb2 | 305 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
306 | |
307 | /* | |
f4266e34 GKH |
308 | * Gpadl is u32 and we are using a pointer which could |
309 | * be 64-bit | |
f27df643 S |
310 | * This is governed by the guest/host protocol and |
311 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 312 | */ |
39d70a4a | 313 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 314 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 315 | |
454f18a9 | 316 | /* add to msg header */ |
c50f7fb2 HZ |
317 | list_add_tail(&msgbody->msglistentry, |
318 | &msgheader->submsglist); | |
39d70a4a HZ |
319 | pfnsum += pfncurr; |
320 | pfnleft -= pfncurr; | |
3e7ee490 | 321 | } |
f4266e34 | 322 | } else { |
454f18a9 | 323 | /* everything fits in a header */ |
39d70a4a | 324 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 325 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
326 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
327 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
328 | if (msgheader == NULL) | |
e3eb7cdd | 329 | goto nomem; |
c50f7fb2 | 330 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
331 | |
332 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
333 | msgheader->msg; |
334 | gpadl_header->rangecount = 1; | |
335 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 336 | pagecount * sizeof(u64); |
415f2287 HZ |
337 | gpadl_header->range[0].byte_offset = 0; |
338 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 339 | for (i = 0; i < pagecount; i++) |
415f2287 | 340 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
341 | |
342 | *msginfo = msgheader; | |
343 | *messagecount = 1; | |
3e7ee490 HJ |
344 | } |
345 | ||
346 | return 0; | |
d1c250bb | 347 | nomem: |
39d70a4a HZ |
348 | kfree(msgheader); |
349 | kfree(msgbody); | |
d1c250bb | 350 | return -ENOMEM; |
3e7ee490 HJ |
351 | } |
352 | ||
3e189519 | 353 | /* |
fff41b2e | 354 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 355 | * |
39d70a4a HZ |
356 | * @channel: a channel |
357 | * @kbuffer: from kmalloc | |
358 | * @size: page-size multiple | |
359 | * @gpadl_handle: some funky thing | |
f4266e34 | 360 | */ |
fff41b2e | 361 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 362 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 363 | { |
39d70a4a HZ |
364 | struct vmbus_channel_gpadl_header *gpadlmsg; |
365 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
366 | struct vmbus_channel_msginfo *msginfo = NULL; |
367 | struct vmbus_channel_msginfo *submsginfo; | |
368 | u32 msgcount; | |
53af545b | 369 | struct list_head *curr; |
39d70a4a | 370 | u32 next_gpadl_handle; |
dd0813b6 | 371 | unsigned long flags; |
c3bf2e26 | 372 | int ret = 0; |
9568a193 | 373 | int t; |
3e7ee490 | 374 | |
da9fcb72 HZ |
375 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
376 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 377 | |
fff41b2e | 378 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
379 | if (ret) |
380 | return ret; | |
3e7ee490 | 381 | |
9568a193 | 382 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 383 | |
c50f7fb2 HZ |
384 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
385 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
386 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
387 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 388 | |
3e7ee490 | 389 | |
15b2f647 | 390 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 391 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 392 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 393 | |
15b2f647 | 394 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 395 | |
c6977677 | 396 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 397 | sizeof(*msginfo)); |
98e08702 | 398 | if (ret != 0) |
00d760b0 | 399 | goto cleanup; |
3e7ee490 | 400 | |
39d70a4a | 401 | if (msgcount > 1) { |
c50f7fb2 | 402 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 403 | |
39d70a4a HZ |
404 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
405 | gpadl_body = | |
c50f7fb2 | 406 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 407 | |
c50f7fb2 HZ |
408 | gpadl_body->header.msgtype = |
409 | CHANNELMSG_GPADL_BODY; | |
410 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 411 | |
c6977677 | 412 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 413 | submsginfo->msgsize - |
39d70a4a | 414 | sizeof(*submsginfo)); |
fd4dc88e | 415 | if (ret != 0) |
00d760b0 | 416 | goto cleanup; |
99259159 | 417 | |
3e7ee490 HJ |
418 | } |
419 | } | |
40961de3 | 420 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 421 | BUG_ON(t == 0); |
0c3b7b2f | 422 | |
3e7ee490 | 423 | |
454f18a9 | 424 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 425 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 426 | |
00d760b0 | 427 | cleanup: |
15b2f647 | 428 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 429 | list_del(&msginfo->msglistentry); |
15b2f647 | 430 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 431 | |
39d70a4a | 432 | kfree(msginfo); |
3e7ee490 HJ |
433 | return ret; |
434 | } | |
98873724 | 435 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 436 | |
3e189519 | 437 | /* |
fff41b2e | 438 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 439 | */ |
fff41b2e | 440 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 441 | { |
82250213 | 442 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 443 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 444 | unsigned long flags; |
9568a193 | 445 | int ret, t; |
3e7ee490 | 446 | |
f4266e34 GKH |
447 | info = kmalloc(sizeof(*info) + |
448 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
449 | if (!info) |
450 | return -ENOMEM; | |
3e7ee490 | 451 | |
9568a193 | 452 | init_completion(&info->waitevent); |
3e7ee490 | 453 | |
c50f7fb2 | 454 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 455 | |
c50f7fb2 HZ |
456 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
457 | msg->child_relid = channel->offermsg.child_relid; | |
458 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 459 | |
15b2f647 | 460 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 461 | list_add_tail(&info->msglistentry, |
da9fcb72 | 462 | &vmbus_connection.chn_msg_list); |
15b2f647 | 463 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 464 | ret = vmbus_post_msg(msg, |
f4266e34 | 465 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 466 | |
0c3b7b2f | 467 | BUG_ON(ret != 0); |
40961de3 | 468 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 469 | BUG_ON(t == 0); |
3e7ee490 | 470 | |
454f18a9 | 471 | /* Received a torndown response */ |
15b2f647 | 472 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 473 | list_del(&info->msglistentry); |
15b2f647 | 474 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 475 | |
8c69f52a | 476 | kfree(info); |
3e7ee490 HJ |
477 | return ret; |
478 | } | |
18726d7a | 479 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 480 | |
e68d2971 | 481 | static void vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 482 | { |
82250213 | 483 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 484 | int ret; |
dad76bf7 | 485 | unsigned long flags; |
3e7ee490 | 486 | |
e68d2971 S |
487 | channel->state = CHANNEL_OPEN_STATE; |
488 | channel->sc_creation_callback = NULL; | |
454f18a9 | 489 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 490 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 491 | channel->onchannel_callback = NULL; |
dad76bf7 | 492 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 493 | |
454f18a9 | 494 | /* Send a closing message */ |
3e7ee490 | 495 | |
e9a27a9f | 496 | msg = &channel->close_msg.msg; |
3e7ee490 | 497 | |
c50f7fb2 HZ |
498 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
499 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 500 | |
c6977677 | 501 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 502 | |
0c3b7b2f | 503 | BUG_ON(ret != 0); |
454f18a9 | 504 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 505 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 506 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 507 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 508 | |
454f18a9 | 509 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
510 | hv_ringbuffer_cleanup(&channel->outbound); |
511 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 512 | |
df3493e0 S |
513 | free_pages((unsigned long)channel->ringbuffer_pages, |
514 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 515 | |
3e7ee490 | 516 | |
3e7ee490 | 517 | } |
e68d2971 S |
518 | |
519 | /* | |
520 | * vmbus_close - Close the specified channel | |
521 | */ | |
522 | void vmbus_close(struct vmbus_channel *channel) | |
523 | { | |
524 | struct list_head *cur, *tmp; | |
525 | struct vmbus_channel *cur_channel; | |
526 | ||
527 | if (channel->primary_channel != NULL) { | |
528 | /* | |
529 | * We will only close sub-channels when | |
530 | * the primary is closed. | |
531 | */ | |
532 | return; | |
533 | } | |
534 | /* | |
535 | * Close all the sub-channels first and then close the | |
536 | * primary channel. | |
537 | */ | |
538 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
539 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
540 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
541 | continue; | |
542 | vmbus_close_internal(cur_channel); | |
543 | } | |
544 | /* | |
545 | * Now close the primary. | |
546 | */ | |
547 | vmbus_close_internal(channel); | |
548 | } | |
70bfa307 | 549 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 550 | |
c88c4e4c | 551 | /** |
fff41b2e | 552 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
553 | * @channel: Pointer to vmbus_channel structure. |
554 | * @buffer: Pointer to the buffer you want to receive the data into. | |
555 | * @bufferlen: Maximum size of what the the buffer will hold | |
556 | * @requestid: Identifier of the request | |
557 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
558 | * packet etc. |
559 | * | |
39d70a4a | 560 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
561 | * This will send the data unparsed to hyper-v. |
562 | * | |
563 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 564 | */ |
fff41b2e | 565 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
566 | u32 bufferlen, u64 requestid, |
567 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 568 | { |
8dc0a06a | 569 | struct vmpacket_descriptor desc; |
39d70a4a | 570 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 571 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
572 | struct scatterlist bufferlist[3]; |
573 | u64 aligned_data = 0; | |
f4266e34 | 574 | int ret; |
98fa8cf4 | 575 | bool signal = false; |
3e7ee490 | 576 | |
3e7ee490 | 577 | |
454f18a9 | 578 | /* Setup the descriptor */ |
415f2287 HZ |
579 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
580 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 581 | /* in 8-bytes granularity */ |
415f2287 HZ |
582 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
583 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
584 | desc.trans_id = requestid; | |
3e7ee490 | 585 | |
39d70a4a HZ |
586 | sg_init_table(bufferlist, 3); |
587 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
588 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
589 | sg_set_buf(&bufferlist[2], &aligned_data, | |
590 | packetlen_aligned - packetlen); | |
3e7ee490 | 591 | |
98fa8cf4 | 592 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 593 | |
98fa8cf4 | 594 | if (ret == 0 && signal) |
fff41b2e | 595 | vmbus_setevent(channel); |
3e7ee490 | 596 | |
3e7ee490 HJ |
597 | return ret; |
598 | } | |
fff41b2e | 599 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 600 | |
3e189519 | 601 | /* |
fff41b2e | 602 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 603 | * packets using a GPADL Direct packet type. |
f4266e34 | 604 | */ |
fff41b2e | 605 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
606 | struct hv_page_buffer pagebuffers[], |
607 | u32 pagecount, void *buffer, u32 bufferlen, | |
608 | u64 requestid) | |
3e7ee490 | 609 | { |
f4266e34 GKH |
610 | int ret; |
611 | int i; | |
430a8e9a | 612 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
613 | u32 descsize; |
614 | u32 packetlen; | |
615 | u32 packetlen_aligned; | |
616 | struct scatterlist bufferlist[3]; | |
617 | u64 aligned_data = 0; | |
98fa8cf4 | 618 | bool signal = false; |
3e7ee490 | 619 | |
39d70a4a | 620 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 621 | return -EINVAL; |
3e7ee490 | 622 | |
3e7ee490 | 623 | |
f4266e34 | 624 | /* |
430a8e9a | 625 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
626 | * largest size we support |
627 | */ | |
39d70a4a HZ |
628 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
629 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 630 | sizeof(struct hv_page_buffer)); |
39d70a4a | 631 | packetlen = descsize + bufferlen; |
73509681 | 632 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 633 | |
454f18a9 | 634 | /* Setup the descriptor */ |
415f2287 | 635 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 636 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
637 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
638 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
639 | desc.transactionid = requestid; | |
640 | desc.rangecount = pagecount; | |
641 | ||
642 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
643 | desc.range[i].len = pagebuffers[i].len; |
644 | desc.range[i].offset = pagebuffers[i].offset; | |
645 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
646 | } |
647 | ||
39d70a4a HZ |
648 | sg_init_table(bufferlist, 3); |
649 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
650 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
651 | sg_set_buf(&bufferlist[2], &aligned_data, | |
652 | packetlen_aligned - packetlen); | |
3e7ee490 | 653 | |
98fa8cf4 | 654 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 655 | |
98fa8cf4 | 656 | if (ret == 0 && signal) |
fff41b2e | 657 | vmbus_setevent(channel); |
3e7ee490 | 658 | |
3e7ee490 HJ |
659 | return ret; |
660 | } | |
713efeb4 | 661 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 662 | |
3e189519 | 663 | /* |
fff41b2e | 664 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 665 | * using a GPADL Direct packet type. |
f4266e34 | 666 | */ |
fff41b2e | 667 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
668 | struct hv_multipage_buffer *multi_pagebuffer, |
669 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 670 | { |
f4266e34 | 671 | int ret; |
430a8e9a | 672 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
673 | u32 descsize; |
674 | u32 packetlen; | |
675 | u32 packetlen_aligned; | |
676 | struct scatterlist bufferlist[3]; | |
677 | u64 aligned_data = 0; | |
98fa8cf4 | 678 | bool signal = false; |
ca623ad3 HZ |
679 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
680 | multi_pagebuffer->len); | |
3e7ee490 | 681 | |
3e7ee490 | 682 | |
39d70a4a | 683 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 684 | return -EINVAL; |
3e7ee490 | 685 | |
f4266e34 | 686 | /* |
430a8e9a | 687 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
688 | * the largest size we support |
689 | */ | |
39d70a4a HZ |
690 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
691 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 692 | sizeof(u64)); |
39d70a4a | 693 | packetlen = descsize + bufferlen; |
73509681 | 694 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 695 | |
3e7ee490 | 696 | |
454f18a9 | 697 | /* Setup the descriptor */ |
415f2287 | 698 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 699 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
700 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
701 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
702 | desc.transactionid = requestid; | |
430a8e9a | 703 | desc.rangecount = 1; |
3e7ee490 | 704 | |
ca623ad3 HZ |
705 | desc.range.len = multi_pagebuffer->len; |
706 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 707 | |
ca623ad3 | 708 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 709 | pfncount * sizeof(u64)); |
3e7ee490 | 710 | |
39d70a4a HZ |
711 | sg_init_table(bufferlist, 3); |
712 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
713 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
714 | sg_set_buf(&bufferlist[2], &aligned_data, | |
715 | packetlen_aligned - packetlen); | |
3e7ee490 | 716 | |
98fa8cf4 | 717 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 718 | |
98fa8cf4 | 719 | if (ret == 0 && signal) |
fff41b2e | 720 | vmbus_setevent(channel); |
3e7ee490 | 721 | |
3e7ee490 HJ |
722 | return ret; |
723 | } | |
4cb106fa | 724 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
725 | |
726 | /** | |
fff41b2e | 727 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
728 | * @channel: Pointer to vmbus_channel structure. |
729 | * @buffer: Pointer to the buffer you want to receive the data into. | |
730 | * @bufferlen: Maximum size of what the the buffer will hold | |
731 | * @buffer_actual_len: The actual size of the data after it was received | |
732 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
733 | * |
734 | * Receives directly from the hyper-v vmbus and puts the data it received | |
735 | * into Buffer. This will receive the data unparsed from hyper-v. | |
736 | * | |
737 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 738 | */ |
fff41b2e | 739 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 740 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 741 | { |
8dc0a06a | 742 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
743 | u32 packetlen; |
744 | u32 userlen; | |
3e7ee490 | 745 | int ret; |
c2b8e520 | 746 | bool signal = false; |
3e7ee490 | 747 | |
39d70a4a HZ |
748 | *buffer_actual_len = 0; |
749 | *requestid = 0; | |
3e7ee490 | 750 | |
3e7ee490 | 751 | |
a89186c2 | 752 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 753 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 754 | if (ret != 0) |
3e7ee490 | 755 | return 0; |
3e7ee490 | 756 | |
415f2287 HZ |
757 | packetlen = desc.len8 << 3; |
758 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 759 | |
39d70a4a | 760 | *buffer_actual_len = userlen; |
3e7ee490 | 761 | |
39d70a4a | 762 | if (userlen > bufferlen) { |
3e7ee490 | 763 | |
0a46618d | 764 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 765 | bufferlen, userlen); |
926ae526 | 766 | return -ETOOSMALL; |
3e7ee490 HJ |
767 | } |
768 | ||
415f2287 | 769 | *requestid = desc.trans_id; |
3e7ee490 | 770 | |
454f18a9 | 771 | /* Copy over the packet to the user buffer */ |
38397c8a | 772 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 773 | (desc.offset8 << 3), &signal); |
3e7ee490 | 774 | |
c2b8e520 S |
775 | if (signal) |
776 | vmbus_setevent(channel); | |
3e7ee490 | 777 | |
3e7ee490 HJ |
778 | return 0; |
779 | } | |
fff41b2e | 780 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 781 | |
3e189519 | 782 | /* |
fff41b2e | 783 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 784 | */ |
fff41b2e | 785 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
786 | u32 bufferlen, u32 *buffer_actual_len, |
787 | u64 *requestid) | |
3e7ee490 | 788 | { |
8dc0a06a | 789 | struct vmpacket_descriptor desc; |
39d70a4a | 790 | u32 packetlen; |
3e7ee490 | 791 | int ret; |
c2b8e520 | 792 | bool signal = false; |
3e7ee490 | 793 | |
39d70a4a HZ |
794 | *buffer_actual_len = 0; |
795 | *requestid = 0; | |
3e7ee490 | 796 | |
3e7ee490 | 797 | |
a89186c2 | 798 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 799 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 800 | if (ret != 0) |
3e7ee490 | 801 | return 0; |
3e7ee490 | 802 | |
3e7ee490 | 803 | |
415f2287 | 804 | packetlen = desc.len8 << 3; |
3e7ee490 | 805 | |
39d70a4a | 806 | *buffer_actual_len = packetlen; |
3e7ee490 | 807 | |
39d70a4a | 808 | if (packetlen > bufferlen) { |
0a46618d HJ |
809 | pr_err("Buffer too small - needed %d bytes but " |
810 | "got space for only %d bytes\n", | |
811 | packetlen, bufferlen); | |
3d5cad97 | 812 | return -ENOBUFS; |
3e7ee490 HJ |
813 | } |
814 | ||
415f2287 | 815 | *requestid = desc.trans_id; |
3e7ee490 | 816 | |
454f18a9 | 817 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
818 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
819 | &signal); | |
820 | ||
821 | if (signal) | |
822 | vmbus_setevent(channel); | |
3e7ee490 | 823 | |
3e7ee490 HJ |
824 | return 0; |
825 | } | |
adaee6bd | 826 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |