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_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; |
f4266e34 | 212 | unsigned long long pfn; |
39d70a4a HZ |
213 | struct vmbus_channel_gpadl_header *gpadl_header; |
214 | struct vmbus_channel_gpadl_body *gpadl_body; | |
215 | struct vmbus_channel_msginfo *msgheader; | |
216 | struct vmbus_channel_msginfo *msgbody = NULL; | |
217 | u32 msgsize; | |
3e7ee490 | 218 | |
39d70a4a | 219 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 220 | |
39d70a4a HZ |
221 | pagecount = size >> PAGE_SHIFT; |
222 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 223 | |
454f18a9 | 224 | /* do we need a gpadl body msg */ |
39d70a4a | 225 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
226 | sizeof(struct vmbus_channel_gpadl_header) - |
227 | sizeof(struct gpa_range); | |
39d70a4a | 228 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 229 | |
39d70a4a | 230 | if (pagecount > pfncount) { |
f4266e34 | 231 | /* we need a gpadl body */ |
454f18a9 | 232 | /* fill in the header */ |
39d70a4a | 233 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 234 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
235 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
236 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
237 | if (!msgheader) | |
d1c250bb | 238 | goto nomem; |
3e7ee490 | 239 | |
c50f7fb2 HZ |
240 | INIT_LIST_HEAD(&msgheader->submsglist); |
241 | msgheader->msgsize = msgsize; | |
3e7ee490 | 242 | |
39d70a4a | 243 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
244 | msgheader->msg; |
245 | gpadl_header->rangecount = 1; | |
246 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 247 | pagecount * sizeof(u64); |
415f2287 HZ |
248 | gpadl_header->range[0].byte_offset = 0; |
249 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 250 | for (i = 0; i < pfncount; i++) |
415f2287 | 251 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
252 | *msginfo = msgheader; |
253 | *messagecount = 1; | |
3e7ee490 | 254 | |
39d70a4a HZ |
255 | pfnsum = pfncount; |
256 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 257 | |
454f18a9 | 258 | /* how many pfns can we fit */ |
39d70a4a | 259 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 260 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 261 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 262 | |
454f18a9 | 263 | /* fill in the body */ |
39d70a4a HZ |
264 | while (pfnleft) { |
265 | if (pfnleft > pfncount) | |
266 | pfncurr = pfncount; | |
3e7ee490 | 267 | else |
39d70a4a | 268 | pfncurr = pfnleft; |
3e7ee490 | 269 | |
39d70a4a | 270 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 271 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
272 | pfncurr * sizeof(u64); |
273 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
274 | |
275 | if (!msgbody) { | |
276 | struct vmbus_channel_msginfo *pos = NULL; | |
277 | struct vmbus_channel_msginfo *tmp = NULL; | |
278 | /* | |
279 | * Free up all the allocated messages. | |
280 | */ | |
281 | list_for_each_entry_safe(pos, tmp, | |
282 | &msgheader->submsglist, | |
283 | msglistentry) { | |
284 | ||
285 | list_del(&pos->msglistentry); | |
286 | kfree(pos); | |
287 | } | |
288 | ||
d1c250bb | 289 | goto nomem; |
f38cf9cc S |
290 | } |
291 | ||
c50f7fb2 | 292 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
293 | (*messagecount)++; |
294 | gpadl_body = | |
c50f7fb2 | 295 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
296 | |
297 | /* | |
f4266e34 GKH |
298 | * Gpadl is u32 and we are using a pointer which could |
299 | * be 64-bit | |
f27df643 S |
300 | * This is governed by the guest/host protocol and |
301 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 302 | */ |
39d70a4a | 303 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 304 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 305 | |
454f18a9 | 306 | /* add to msg header */ |
c50f7fb2 HZ |
307 | list_add_tail(&msgbody->msglistentry, |
308 | &msgheader->submsglist); | |
39d70a4a HZ |
309 | pfnsum += pfncurr; |
310 | pfnleft -= pfncurr; | |
3e7ee490 | 311 | } |
f4266e34 | 312 | } else { |
454f18a9 | 313 | /* everything fits in a header */ |
39d70a4a | 314 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 315 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
316 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
317 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
318 | if (msgheader == NULL) | |
e3eb7cdd | 319 | goto nomem; |
c50f7fb2 | 320 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
321 | |
322 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
323 | msgheader->msg; |
324 | gpadl_header->rangecount = 1; | |
325 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 326 | pagecount * sizeof(u64); |
415f2287 HZ |
327 | gpadl_header->range[0].byte_offset = 0; |
328 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 329 | for (i = 0; i < pagecount; i++) |
415f2287 | 330 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
331 | |
332 | *msginfo = msgheader; | |
333 | *messagecount = 1; | |
3e7ee490 HJ |
334 | } |
335 | ||
336 | return 0; | |
d1c250bb | 337 | nomem: |
39d70a4a HZ |
338 | kfree(msgheader); |
339 | kfree(msgbody); | |
d1c250bb | 340 | return -ENOMEM; |
3e7ee490 HJ |
341 | } |
342 | ||
3e189519 | 343 | /* |
fff41b2e | 344 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 345 | * |
39d70a4a HZ |
346 | * @channel: a channel |
347 | * @kbuffer: from kmalloc | |
348 | * @size: page-size multiple | |
349 | * @gpadl_handle: some funky thing | |
f4266e34 | 350 | */ |
fff41b2e | 351 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 352 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 353 | { |
39d70a4a HZ |
354 | struct vmbus_channel_gpadl_header *gpadlmsg; |
355 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
356 | struct vmbus_channel_msginfo *msginfo = NULL; |
357 | struct vmbus_channel_msginfo *submsginfo; | |
358 | u32 msgcount; | |
53af545b | 359 | struct list_head *curr; |
39d70a4a | 360 | u32 next_gpadl_handle; |
dd0813b6 | 361 | unsigned long flags; |
c3bf2e26 | 362 | int ret = 0; |
9568a193 | 363 | int t; |
3e7ee490 | 364 | |
da9fcb72 HZ |
365 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
366 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 367 | |
fff41b2e | 368 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
369 | if (ret) |
370 | return ret; | |
3e7ee490 | 371 | |
9568a193 | 372 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 373 | |
c50f7fb2 HZ |
374 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
375 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
376 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
377 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 378 | |
3e7ee490 | 379 | |
15b2f647 | 380 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 381 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 382 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 383 | |
15b2f647 | 384 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 385 | |
c6977677 | 386 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 387 | sizeof(*msginfo)); |
98e08702 | 388 | if (ret != 0) |
00d760b0 | 389 | goto cleanup; |
3e7ee490 | 390 | |
39d70a4a | 391 | if (msgcount > 1) { |
c50f7fb2 | 392 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 393 | |
39d70a4a HZ |
394 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
395 | gpadl_body = | |
c50f7fb2 | 396 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 397 | |
c50f7fb2 HZ |
398 | gpadl_body->header.msgtype = |
399 | CHANNELMSG_GPADL_BODY; | |
400 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 401 | |
c6977677 | 402 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 403 | submsginfo->msgsize - |
39d70a4a | 404 | sizeof(*submsginfo)); |
fd4dc88e | 405 | if (ret != 0) |
00d760b0 | 406 | goto cleanup; |
99259159 | 407 | |
3e7ee490 HJ |
408 | } |
409 | } | |
40961de3 | 410 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 411 | BUG_ON(t == 0); |
0c3b7b2f | 412 | |
3e7ee490 | 413 | |
454f18a9 | 414 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 415 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 416 | |
00d760b0 | 417 | cleanup: |
15b2f647 | 418 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 419 | list_del(&msginfo->msglistentry); |
15b2f647 | 420 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 421 | |
39d70a4a | 422 | kfree(msginfo); |
3e7ee490 HJ |
423 | return ret; |
424 | } | |
98873724 | 425 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 426 | |
3e189519 | 427 | /* |
fff41b2e | 428 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 429 | */ |
fff41b2e | 430 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 431 | { |
82250213 | 432 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 433 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 434 | unsigned long flags; |
9568a193 | 435 | int ret, t; |
3e7ee490 | 436 | |
f4266e34 GKH |
437 | info = kmalloc(sizeof(*info) + |
438 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
439 | if (!info) |
440 | return -ENOMEM; | |
3e7ee490 | 441 | |
9568a193 | 442 | init_completion(&info->waitevent); |
3e7ee490 | 443 | |
c50f7fb2 | 444 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 445 | |
c50f7fb2 HZ |
446 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
447 | msg->child_relid = channel->offermsg.child_relid; | |
448 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 449 | |
15b2f647 | 450 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 451 | list_add_tail(&info->msglistentry, |
da9fcb72 | 452 | &vmbus_connection.chn_msg_list); |
15b2f647 | 453 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 454 | ret = vmbus_post_msg(msg, |
f4266e34 | 455 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 456 | |
0c3b7b2f | 457 | BUG_ON(ret != 0); |
40961de3 | 458 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 459 | BUG_ON(t == 0); |
3e7ee490 | 460 | |
454f18a9 | 461 | /* Received a torndown response */ |
15b2f647 | 462 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 463 | list_del(&info->msglistentry); |
15b2f647 | 464 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 465 | |
8c69f52a | 466 | kfree(info); |
3e7ee490 HJ |
467 | return ret; |
468 | } | |
18726d7a | 469 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 470 | |
e68d2971 | 471 | static void vmbus_close_internal(struct vmbus_channel *channel) |
3e7ee490 | 472 | { |
82250213 | 473 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 474 | int ret; |
dad76bf7 | 475 | unsigned long flags; |
3e7ee490 | 476 | |
e68d2971 S |
477 | channel->state = CHANNEL_OPEN_STATE; |
478 | channel->sc_creation_callback = NULL; | |
454f18a9 | 479 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 480 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 481 | channel->onchannel_callback = NULL; |
dad76bf7 | 482 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 483 | |
454f18a9 | 484 | /* Send a closing message */ |
3e7ee490 | 485 | |
e9a27a9f | 486 | msg = &channel->close_msg.msg; |
3e7ee490 | 487 | |
c50f7fb2 HZ |
488 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
489 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 490 | |
c6977677 | 491 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 492 | |
0c3b7b2f | 493 | BUG_ON(ret != 0); |
454f18a9 | 494 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 495 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 496 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 497 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 498 | |
454f18a9 | 499 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
500 | hv_ringbuffer_cleanup(&channel->outbound); |
501 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 502 | |
df3493e0 S |
503 | free_pages((unsigned long)channel->ringbuffer_pages, |
504 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 505 | |
3e7ee490 | 506 | |
3e7ee490 | 507 | } |
e68d2971 S |
508 | |
509 | /* | |
510 | * vmbus_close - Close the specified channel | |
511 | */ | |
512 | void vmbus_close(struct vmbus_channel *channel) | |
513 | { | |
514 | struct list_head *cur, *tmp; | |
515 | struct vmbus_channel *cur_channel; | |
516 | ||
517 | if (channel->primary_channel != NULL) { | |
518 | /* | |
519 | * We will only close sub-channels when | |
520 | * the primary is closed. | |
521 | */ | |
522 | return; | |
523 | } | |
524 | /* | |
525 | * Close all the sub-channels first and then close the | |
526 | * primary channel. | |
527 | */ | |
528 | list_for_each_safe(cur, tmp, &channel->sc_list) { | |
529 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
530 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
531 | continue; | |
532 | vmbus_close_internal(cur_channel); | |
533 | } | |
534 | /* | |
535 | * Now close the primary. | |
536 | */ | |
537 | vmbus_close_internal(channel); | |
538 | } | |
70bfa307 | 539 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 540 | |
c88c4e4c | 541 | /** |
fff41b2e | 542 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
543 | * @channel: Pointer to vmbus_channel structure. |
544 | * @buffer: Pointer to the buffer you want to receive the data into. | |
545 | * @bufferlen: Maximum size of what the the buffer will hold | |
546 | * @requestid: Identifier of the request | |
547 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
548 | * packet etc. |
549 | * | |
39d70a4a | 550 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
551 | * This will send the data unparsed to hyper-v. |
552 | * | |
553 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 554 | */ |
fff41b2e | 555 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
556 | u32 bufferlen, u64 requestid, |
557 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 558 | { |
8dc0a06a | 559 | struct vmpacket_descriptor desc; |
39d70a4a | 560 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 561 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
562 | struct scatterlist bufferlist[3]; |
563 | u64 aligned_data = 0; | |
f4266e34 | 564 | int ret; |
98fa8cf4 | 565 | bool signal = false; |
3e7ee490 | 566 | |
3e7ee490 | 567 | |
454f18a9 | 568 | /* Setup the descriptor */ |
415f2287 HZ |
569 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
570 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 571 | /* in 8-bytes granularity */ |
415f2287 HZ |
572 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
573 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
574 | desc.trans_id = requestid; | |
3e7ee490 | 575 | |
39d70a4a HZ |
576 | sg_init_table(bufferlist, 3); |
577 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
578 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
579 | sg_set_buf(&bufferlist[2], &aligned_data, | |
580 | packetlen_aligned - packetlen); | |
3e7ee490 | 581 | |
98fa8cf4 | 582 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 583 | |
98fa8cf4 | 584 | if (ret == 0 && signal) |
fff41b2e | 585 | vmbus_setevent(channel); |
3e7ee490 | 586 | |
3e7ee490 HJ |
587 | return ret; |
588 | } | |
fff41b2e | 589 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 590 | |
3e189519 | 591 | /* |
fff41b2e | 592 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 593 | * packets using a GPADL Direct packet type. |
f4266e34 | 594 | */ |
fff41b2e | 595 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
596 | struct hv_page_buffer pagebuffers[], |
597 | u32 pagecount, void *buffer, u32 bufferlen, | |
598 | u64 requestid) | |
3e7ee490 | 599 | { |
f4266e34 GKH |
600 | int ret; |
601 | int i; | |
430a8e9a | 602 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
603 | u32 descsize; |
604 | u32 packetlen; | |
605 | u32 packetlen_aligned; | |
606 | struct scatterlist bufferlist[3]; | |
607 | u64 aligned_data = 0; | |
98fa8cf4 | 608 | bool signal = false; |
3e7ee490 | 609 | |
39d70a4a | 610 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 611 | return -EINVAL; |
3e7ee490 | 612 | |
3e7ee490 | 613 | |
f4266e34 | 614 | /* |
430a8e9a | 615 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
616 | * largest size we support |
617 | */ | |
39d70a4a HZ |
618 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
619 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 620 | sizeof(struct hv_page_buffer)); |
39d70a4a | 621 | packetlen = descsize + bufferlen; |
73509681 | 622 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 623 | |
454f18a9 | 624 | /* Setup the descriptor */ |
415f2287 | 625 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 626 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
627 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
628 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
629 | desc.transactionid = requestid; | |
630 | desc.rangecount = pagecount; | |
631 | ||
632 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
633 | desc.range[i].len = pagebuffers[i].len; |
634 | desc.range[i].offset = pagebuffers[i].offset; | |
635 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
636 | } |
637 | ||
39d70a4a HZ |
638 | sg_init_table(bufferlist, 3); |
639 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
640 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
641 | sg_set_buf(&bufferlist[2], &aligned_data, | |
642 | packetlen_aligned - packetlen); | |
3e7ee490 | 643 | |
98fa8cf4 | 644 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 645 | |
98fa8cf4 | 646 | if (ret == 0 && signal) |
fff41b2e | 647 | vmbus_setevent(channel); |
3e7ee490 | 648 | |
3e7ee490 HJ |
649 | return ret; |
650 | } | |
713efeb4 | 651 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 652 | |
3e189519 | 653 | /* |
fff41b2e | 654 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 655 | * using a GPADL Direct packet type. |
f4266e34 | 656 | */ |
fff41b2e | 657 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
658 | struct hv_multipage_buffer *multi_pagebuffer, |
659 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 660 | { |
f4266e34 | 661 | int ret; |
430a8e9a | 662 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
663 | u32 descsize; |
664 | u32 packetlen; | |
665 | u32 packetlen_aligned; | |
666 | struct scatterlist bufferlist[3]; | |
667 | u64 aligned_data = 0; | |
98fa8cf4 | 668 | bool signal = false; |
ca623ad3 HZ |
669 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
670 | multi_pagebuffer->len); | |
3e7ee490 | 671 | |
3e7ee490 | 672 | |
39d70a4a | 673 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 674 | return -EINVAL; |
3e7ee490 | 675 | |
f4266e34 | 676 | /* |
430a8e9a | 677 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
678 | * the largest size we support |
679 | */ | |
39d70a4a HZ |
680 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
681 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 682 | sizeof(u64)); |
39d70a4a | 683 | packetlen = descsize + bufferlen; |
73509681 | 684 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 685 | |
3e7ee490 | 686 | |
454f18a9 | 687 | /* Setup the descriptor */ |
415f2287 | 688 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 689 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
690 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
691 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
692 | desc.transactionid = requestid; | |
430a8e9a | 693 | desc.rangecount = 1; |
3e7ee490 | 694 | |
ca623ad3 HZ |
695 | desc.range.len = multi_pagebuffer->len; |
696 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 697 | |
ca623ad3 | 698 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 699 | pfncount * sizeof(u64)); |
3e7ee490 | 700 | |
39d70a4a HZ |
701 | sg_init_table(bufferlist, 3); |
702 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
703 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
704 | sg_set_buf(&bufferlist[2], &aligned_data, | |
705 | packetlen_aligned - packetlen); | |
3e7ee490 | 706 | |
98fa8cf4 | 707 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 708 | |
98fa8cf4 | 709 | if (ret == 0 && signal) |
fff41b2e | 710 | vmbus_setevent(channel); |
3e7ee490 | 711 | |
3e7ee490 HJ |
712 | return ret; |
713 | } | |
4cb106fa | 714 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
715 | |
716 | /** | |
fff41b2e | 717 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
718 | * @channel: Pointer to vmbus_channel structure. |
719 | * @buffer: Pointer to the buffer you want to receive the data into. | |
720 | * @bufferlen: Maximum size of what the the buffer will hold | |
721 | * @buffer_actual_len: The actual size of the data after it was received | |
722 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
723 | * |
724 | * Receives directly from the hyper-v vmbus and puts the data it received | |
725 | * into Buffer. This will receive the data unparsed from hyper-v. | |
726 | * | |
727 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 728 | */ |
fff41b2e | 729 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 730 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 731 | { |
8dc0a06a | 732 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
733 | u32 packetlen; |
734 | u32 userlen; | |
3e7ee490 | 735 | int ret; |
c2b8e520 | 736 | bool signal = false; |
3e7ee490 | 737 | |
39d70a4a HZ |
738 | *buffer_actual_len = 0; |
739 | *requestid = 0; | |
3e7ee490 | 740 | |
3e7ee490 | 741 | |
a89186c2 | 742 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 743 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 744 | if (ret != 0) |
3e7ee490 | 745 | return 0; |
3e7ee490 | 746 | |
415f2287 HZ |
747 | packetlen = desc.len8 << 3; |
748 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 749 | |
39d70a4a | 750 | *buffer_actual_len = userlen; |
3e7ee490 | 751 | |
39d70a4a | 752 | if (userlen > bufferlen) { |
3e7ee490 | 753 | |
0a46618d | 754 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 755 | bufferlen, userlen); |
926ae526 | 756 | return -ETOOSMALL; |
3e7ee490 HJ |
757 | } |
758 | ||
415f2287 | 759 | *requestid = desc.trans_id; |
3e7ee490 | 760 | |
454f18a9 | 761 | /* Copy over the packet to the user buffer */ |
38397c8a | 762 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 763 | (desc.offset8 << 3), &signal); |
3e7ee490 | 764 | |
c2b8e520 S |
765 | if (signal) |
766 | vmbus_setevent(channel); | |
3e7ee490 | 767 | |
3e7ee490 HJ |
768 | return 0; |
769 | } | |
fff41b2e | 770 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 771 | |
3e189519 | 772 | /* |
fff41b2e | 773 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 774 | */ |
fff41b2e | 775 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
776 | u32 bufferlen, u32 *buffer_actual_len, |
777 | u64 *requestid) | |
3e7ee490 | 778 | { |
8dc0a06a | 779 | struct vmpacket_descriptor desc; |
39d70a4a | 780 | u32 packetlen; |
3e7ee490 | 781 | int ret; |
c2b8e520 | 782 | bool signal = false; |
3e7ee490 | 783 | |
39d70a4a HZ |
784 | *buffer_actual_len = 0; |
785 | *requestid = 0; | |
3e7ee490 | 786 | |
3e7ee490 | 787 | |
a89186c2 | 788 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 789 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 790 | if (ret != 0) |
3e7ee490 | 791 | return 0; |
3e7ee490 | 792 | |
3e7ee490 | 793 | |
415f2287 | 794 | packetlen = desc.len8 << 3; |
3e7ee490 | 795 | |
39d70a4a | 796 | *buffer_actual_len = packetlen; |
3e7ee490 | 797 | |
39d70a4a | 798 | if (packetlen > bufferlen) { |
0a46618d HJ |
799 | pr_err("Buffer too small - needed %d bytes but " |
800 | "got space for only %d bytes\n", | |
801 | packetlen, bufferlen); | |
3d5cad97 | 802 | return -ENOBUFS; |
3e7ee490 HJ |
803 | } |
804 | ||
415f2287 | 805 | *requestid = desc.trans_id; |
3e7ee490 | 806 | |
454f18a9 | 807 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
808 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
809 | &signal); | |
810 | ||
811 | if (signal) | |
812 | vmbus_setevent(channel); | |
3e7ee490 | 813 | |
33b06938 | 814 | return ret; |
3e7ee490 | 815 | } |
adaee6bd | 816 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |